{"id":168230,"date":"2024-08-07T10:00:49","date_gmt":"2024-08-07T14:00:49","guid":{"rendered":"https:\/\/www.theparisreview.org\/blog\/?p=168230"},"modified":"2024-08-13T10:52:20","modified_gmt":"2024-08-13T14:52:20","slug":"four-letters-from-simone-to-andre-weil","status":"publish","type":"post","link":"https:\/\/www.theparisreview.org\/blog\/2024\/08\/07\/four-letters-from-simone-to-andre-weil\/","title":{"rendered":"Four Letters from Simone to Andr\u00e9 Weil"},"content":{"rendered":"<blockquote><p><a href=\"https:\/\/www.theparisreview.org\/blog\/wp-content\/uploads\/2024\/08\/bloom-pr633.tif\"><img decoding=\"async\" class=\"alignnone size-full wp-image-168266\" src=\"https:\/\/www.theparisreview.org\/blog\/wp-content\/uploads\/2024\/08\/bloom-pr633.tif\" alt=\"\" \/><\/a><\/p>\n<div id=\"attachment_168267\" style=\"width: 1034px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-168267\" class=\"wp-image-168267 size-large\" src=\"https:\/\/www.theparisreview.org\/blog\/wp-content\/uploads\/2024\/08\/screenshot-2024-08-06-at-164023-e1722976961642-1024x758.png\" alt=\"\" width=\"1024\" height=\"758\" srcset=\"https:\/\/www.theparisreview.org\/blog\/wp-content\/uploads\/2024\/08\/screenshot-2024-08-06-at-164023-e1722976961642-1024x758.png 1024w, https:\/\/www.theparisreview.org\/blog\/wp-content\/uploads\/2024\/08\/screenshot-2024-08-06-at-164023-e1722976961642-300x222.png 300w, https:\/\/www.theparisreview.org\/blog\/wp-content\/uploads\/2024\/08\/screenshot-2024-08-06-at-164023-e1722976961642-768x568.png 768w, https:\/\/www.theparisreview.org\/blog\/wp-content\/uploads\/2024\/08\/screenshot-2024-08-06-at-164023-e1722976961642-1536x1136.png 1536w, https:\/\/www.theparisreview.org\/blog\/wp-content\/uploads\/2024\/08\/screenshot-2024-08-06-at-164023-e1722976961642-2048x1515.png 2048w\" sizes=\"auto, (min-width: 62.5em) 67vw, 100vw\" \/><p id=\"caption-attachment-168267\" class=\"wp-caption-text\">From <a href=\"https:\/\/theparisreview.org\/art-photography\/6364\/sample-trees-ben-lerner-thomas-demand\"><em>Sample Trees<\/em><\/a>, a portfolio by Ben Lerner and Thomas Demand in <em>The Paris Review<\/em> issue no. 212 (Spring 2015).<\/p><\/div><\/blockquote>\n<p><em>When asked if there was \u201ca close intimacy\u201d between him and his sister, Andr\u00e9 Weil replied, \u201cVery much so. My sister as a child always followed me, and my grandmother, who liked to drop into German occasionally, used to say that she was a veritable <\/em>Kopiermaschine<em>.\u201d Biographers have emphasized\u2014overly so, according to Andr\u00e9 Weil\u2014the episode described by his sister in a May 1942 letter to Father Perrin, known as her \u201cSpiritual Autobiography\u201d: \u201cAt fourteen I fell into one of those fits of bottomless despair which come with adolescence, and I seriously thought of dying because of the mediocrity of my natural faculties. The exceptional gifts of my brother, who had a childhood and youth comparable to those of Pascal, brought my own inferiority home to me.&#8221;<\/em><\/p>\n<p><em>The largest part of the known correspondence between Simone and Andr\u00e9 Weil dates from the period when Andr\u00e9 was imprisoned for being absent without leave from his military duties; he was held first in Le Havre, then Rouen, from February to early May 1940. These circumstances gave Simone Weil an opportunity to explore scientific, and particularly mathematical, questions that were significant to her. In particular, one must note the importance given to the crisis of incommensurables in her correspondence. The reason this moment in the history of thought plays a central role at this point in Simone Weil\u2019s reflection on science is well defined by Andr\u00e9 Weil in a letter dated March 28, 1940: \u201cA proportion is what is named; the fact that there are relations that aren\u2019t nameable (and nameable is a relation between whole numbers), that there have been <\/em>\u03bb\u03cc\u03b3\u03bf\u03b9 \u1f04\u03bb\u03cc\u03b3\u03bf\u03b9<em>, the word itself is so deeply moving that I can\u2019t believe that in a period so essentially dramatic \u2026 such an extraordinary event could have been seen as a mere scientific discovery \u2026 what you say about proportion suggests that, at the beginnings of Greek thought, there was such an intense feeling of the disproportion between thought and world (and, as you say, between man and God) that they had to build a bridge over this abyss at all costs. That they thought they found it \u2026 in mathematics is nothing if not credible.\u201d <\/em><!--more--><\/p>\n<p><em>The crisis of reason that Simone Weil apprehended in contemporary physics led her to revisit the birth of the scientific spirit. The relationship between this crisis of science as a crisis of reason and her interest in the question of incommensurables is clear. Rationalizing irrationals was at the heart of the mathematical problem of incommensurables. According to Simone Weil\u2019s interpretation, the same difficulty was encountered in her day with quantum theory (see her study \u201cClassical Science and After,\u201d as well as the article \u201cReflections on Quantum Theory\u201d). How do we rationalize what appears\u2014according to her interpretation\u2014to be an \u201cirrational\u201d of this theory, in particular its uses of discontinuity and probability, notions on which the new physics rested? Could the crisis of reason, which is also a crisis of the notion of truth in contemporary physics, cause the same mental aberrations as the one produced by incommensurability, an aberration that led the Sophists to be skeptical of Logos and truth? Simone Weil\u2019s references to Plato and her constant appeal to a new Eudoxus represent a desire to escape the skepticism of a new sophistry. She would write to her brother: \u201cThe popularization of this discovery casts discredit upon the notion of truth that has lasted to this day; it \u2026 contributed to the appearance of the idea that one can equally well demonstrate two contradictory theories; the Sophists spread this point of view among the masses, along with knowledge of an inferior quality, exclusively aimed at the conquest of power.\u201d This marriage of a purely operative and combinatory science with the quest for power is what Simone Weil feared.<\/em><\/p>\n<p style=\"text-align: right;\"><em>\u2014Robert Chenavier and Andr\u00e9 A. Devaux<\/em><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: right;\">Saturday [February\u00a01940]<\/p>\n<p>Dear Andr\u00e9,<\/p>\n<p>I see that for the moment your morale is good. I hope this will last. Your letter brought us considerable comfort. You ask us for many details; it\u2019s not very easy. I don\u2019t really know what to tell you about myself; my life is currently devoid of any memorable events. I wrote an article comparing politics in ancient Rome to the events of our era for <em>Les nouveaux cahiers<\/em> [The new notebooks]; I found singular analogies, but I think I already told you about it last winter. Only the first part of the article could be published; it\u2019s such a shame. In the course of the preparatory reading I did, I discovered someone admirable: it\u2019s Theodoric, the one who has his sepulcher in Ravenna. Procopius, who was in the camp opposed to him, said that during his entire reign he only committed one injustice, and that he died of sorrow over it. His letters (Theodoric\u2019s) are delightful. Aside from that there\u2019s an article by me on the <em>Iliad<\/em> awaiting publication by the <em>N.R.F<\/em>. I don\u2019t know what will come of it. It contains bits of translation in which I was able, for certain lines, to keep the exact order of the words; in any case I was always able to translate line by line, I mean to have one line (of irregular length) of the French text correspond to each line of verse. If you know bits of the <em>Iliad<\/em> by heart, you could try to translate them; when you use a method like this one, it often takes a half hour or more to finish a line. It\u2019s also excellent for forming style. Translating Keats into French (in French verse, for example) must also be a fun exercise. I\u2019ve never tried.<\/p>\n<p>A good occupation when one has too much time would also be to think of a way to let laypeople such as myself glimpse what exactly the interest and significance of your work is. For even supposing that it\u2019s absolutely impossible, as you maintain, the fact of trying surely would not be without benefit to you. The benefit would be, I think, considerable. And even if you don\u2019t succeed in formulating something I can understand, I think I would glimpse enough for it to be extremely interesting to me. Especially since I am less interested in mathematics than in mathematicians, as with every other field.<\/p>\n<p>To come back to me, lastly, to make use of those moments when my capacity for work is weak (they are frequent), I\u2019ve started studying Babylonian. I have a selection of Assyro-Babylonian texts, with the text transcribed in Latin characters, and the translation opposite, line by line; I\u2019m playing around with making a juxtalinear translation without a grammar or a dictionary. In this way, I made the acquaintance of a certain Gilgamesh, the hero of an epic translated from the Sumerian. Friendship is its driving spirit; Gilgamesh loses his friend and immediately starts fearing death and running through the desert looking for eternal life, but he doesn\u2019t find it. Later, he evokes his dead friend\u2019s shadow, which gives him not very comforting information about existence beyond the grave. I read a few <span style=\"text-decoration: line-through;\">words<\/span> lines of it to Evelyne, who has already retained a few words of Babylonian from it. As language and as poetry, it\u2019s far from being as good as Homeric Greek. Egyptian would be more interesting, but it\u2019s too hard.<\/p>\n<p>See you soon, I hope. I hope we\u2019ll be able to bring you books. Do you want Retz\u2019s <em>Memoirs<\/em> and Pepys\u2019s <em>Diary<\/em>? I deeply hope we\u2019ll be able to see each other tomorrow or the day after tomorrow, since it\u2019s impossible for us to trade places, which would be my deepest desire.<\/p>\n<p style=\"text-align: right;\">Simone<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: right;\">[February 1940]<\/p>\n<p>Dear Andr\u00e9,<\/p>\n<p>We still need to wait a little, it appears, before we have the authorization to see you as much as we would like. In the meantime, there\u2019s nothing to do but write. But I hope that with some paper and books now, you aren\u2019t bored, and that you exercise to keep in good shape.<\/p>\n<p>Who knows, maybe you\u2019ll discover some fascinating things? But here\u2019s another distraction, now that you have leisure time. I don\u2019t remember if I told you about this in the letter I wrote you from Le Havre, and that you must have received by now, but never mind. It would be to look for a way to make commoners (me, for example) appreciate the value of your current research. I\u2019m sure this would be a very good exercise for you. What do you risk? You don\u2019t risk wasting your time, since you have time to waste. It\u2019s all fine and dandy for you to make fun of people like one of my former friends at rue d\u2019Ulm who philosophize about mathematics without knowing anything about it, but perhaps it\u2019s the mathematicians themselves who should try to do this work. Not like your friend Claude, of course. Not like the hero of Balzac\u2019s <em>Unknown Masterpiece<\/em> when he meditates on painting. But maybe there\u2019s a way for one to become aware of what one is doing, and the value in what one is doing. And if one becomes aware of it, it must be possible to let nonspecialists at least get a glimpse of it. What would it cost you to try? I would be fascinated.<\/p>\n<p>I think you were already no longer in Paris when I managed to get a copy of the book on Babylonian and Egyptian mathematics. I don\u2019t know if I wrote you that I was able to get it. I want to write to the author about a question he leaves unresolved, that of the means by which the Egyptians were able, with a geometry he considers extremely crude and empirical, to find a remarkably accurate approximation of \u03c0, that is to say surface area of the circle = (8\/9d)^2. This seems quite easy to imagine, if one assumes the methods are very crude. If the circumscribed square is divided into eighty-one little squares, one can consider that the circle\u2019s surface area can be found by subtracting three of these squares from each corner, plus the approximate sum of three half-squares.<\/p>\n<p>There\u2019s a truly delightful Babylonian problem. One is given the dimensions of a canal to be dug, a worker\u2019s daily output in volume of earth displaced, and the sum of workdays and workers. One must find the number of workdays and that of workers. I wonder what students\u2019 parents would say if an exam today included a problem formulated in similar terms? It would be fun to try it. Strange people, those Babylonians. Personally, I don\u2019t much like this abstract thinking. The Sumerians must have been a lot more congenial. First of all, they\u2019re the ones who invented all the Mesopotamian myths, and myths are far more interesting than algebra. But you, you must be directly descended from the Babylonians. As for me, I do think that God, as the Pythagoreans put it, is ever a geometer\u2014but not an algebraist. Be that as it may, I was pleased, when I read the last letter I received from you, to see that you denied being a member of the abstract school.<\/p>\n<p>I remember that at Chan\u00e7ay or Dieu-le fit [sic] you said that these studies of Egypt and Babylon cast doubt on the role heretofore attributed to the Greeks as creators in the discipline of mathematics. On the contrary, I think that so far (subject to later discoveries) they provide a confirmation of this role. The Babylonians appear to have focused on abstract exercises concerning numbers, the Egyptians to have proceeded in a completely empirical manner\u2014The application of a rational method to concrete problems and to the study of nature seems to have been specific to the Greeks. (It\u2019s true that one would need to know Babylonian astronomy to be able to judge.) What is singular is that the Greeks must have known Babylonian algebra, and yet one doesn\u2019t find a trace of it in them before Diophantus (who lived, if I\u2019m not mistaken, in the fourth century <small>A.D.<\/small>). The Pythagoreans\u2019 algebraic geometry is something else entirely. Religious conceptions must be behind this; apparently the Pythagoreans\u2019 secret religion made use of geometry, and not algebra. If the Roman empire hadn\u2019t destroyed all the esoteric cults, maybe we would understand something about these enigmas.<\/p>\n<p>I think I told you that I published half a study comparing ancient Rome to certain contemporary phenomena in <em>Les nouveaux cahiers<\/em>. The second part was deeply appreciated by those who had the opportunity to read it, but their numbers were very limited. The first part got me a letter that gave us a good laugh and which I\u2019ll copy for you here:<\/p>\n<blockquote><p>Madam,<\/p>\n<p>Reduced to immobility and not knowing \u201cwho\u201d I could consult, I turn to you to inform me: Who are you? An article in the January\u00a01st\u00a0issue of <em>Les nouveaux cahiers <\/em>is behind this question.<\/p>\n<p style=\"text-align: right;\">Sincerely,<\/p>\n<\/blockquote>\n<p>The signature is unknown to me. Your mother thinks it\u2019s someone burning with a desire to avenge the Romans, and that \u201creduced to immobility\u201d means: If I wasn\u2019t reduced to immobility, I would show you. \u2026 On the off chance, I didn\u2019t reply. I wanted to reply: And you, sir?\u2014or else: <em>sum qui sum<\/em>\u2014or to send a photo of myself\u2014or a copy of my identity card. But it still seemed preferable to me to save twenty <em>sous<\/em>. He will never know who I am. The question is formulated in a truly admirable manner.<\/p>\n<p>I\u2019m only telling you about things of no interest, but I don\u2019t find \u201ccast-iron prose\u201d at the tip of my pen every day.<\/p>\n<p>Thank you for saying that the future needs me, but, as I see it, it doesn\u2019t need me any more than I need it. If only I had a time-travel machine, I wouldn\u2019t point it at the future, I would point it at the past. And I wouldn\u2019t even stop at the Greeks, I would go at least as far as the Aegeo-Cretan era. But the mere thought takes effect on me as a mirage would on a man lost in the desert. It makes me thirsty. It\u2019s better not to think about it, since we\u2019re confined on this tiny planet and it will only become big, fertile, and varied again, as it once was, long after us\u2014if it ever does again.<\/p>\n<p>In the meantime, enjoy Aeschylus and the Sanskrit texts, which I hope you will soon receive.<\/p>\n<p style=\"text-align: right;\">Simone<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: right;\">[March 1940]<\/p>\n<p>My dear brother,<\/p>\n<p>I\u2019m sending back your dedication in a slightly modified version. You\u2019ll notice the reasons for the modifications yourself, I think. Most are prompted by concerns with logic and style, and especially the concern with preserving the unity of tone. I\u2019m inclined to entirely cut the metaphor about sowing, wheat, etc., because it\u2019s really not in the Louis XIII style of the whole thing, and the contrast is damaging. (Furthermore, the term plowing in this metaphor couldn\u2019t be more unsuitable, for obvious reasons.) I slightly modified the terms of the temple metaphor, primarily for the same reason (to avoid a break in the unity of tone), and also to attenuate it and make it a little vaguer; it would prob ably be disagreeable for \u00c9[lie] Cartan, and in every respect inappropriate, for it to be written in such a way as to suggest an opposition between him, alone on one side, and everyone else on the other. In the last line, I changed one word, because your lawyer <em>absolutely<\/em> advises against leaving the one you used. Overall, I thought it wise to change a few nuances of detail that could lead ill-intentioned people to doubt whether you\u2019re seriously expressing what you think.<\/p>\n<p>Now just use these suggestions as you please, and send Henri Cartan the definitive text you\u2019ve settled on.<\/p>\n<p>I think it\u2019s better to give up on the: \u201cTo Monsieur Monsieur \u2026\u201d One reader in a hundred might know this was the custom in the seventeenth century, and even he won\u2019t think it\u2019s serious.<\/p>\n<p>We\u2019ve given the proofs to the publisher. He\u2019s asking for the dedication as soon as possible, of course.<\/p>\n<p>I\u2019m pleased to see that reading my friend Retz has given you a taste for that period\u2019s style. It is infinitely superior, in my view, to that of the second half of the seventeenth century.<\/p>\n<p style=\"text-align: right;\">Fraternally,<br \/>\nSimone<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: right;\">[March 1940]<\/p>\n<p>My dear brother,<\/p>\n<p>Whatever you say about it, \u201csome disquiet,\u201d works very nicely. But discussing details of style in writing would be long and tiresome. I think your text has now reached the state of perfection, if as Val\u00e9ry puts it perfection is defined by the exhaustion of the desire to modify.<\/p>\n<p>How could you take my coadjutor for a Neapolitan! What blasphemy! Has anyone ever come out of there, in terms of political geniuses, other than low schemers? Doesn\u2019t he exude Florence from every pore? And don\u2019t you remember the Gondi Palace, in Florence, on Piazza della Signoria, set back on the left when one looks at the palace della Signoria? It isn\u2019t adorned with much, but is most beautiful. I suppose the Neapolitan abbot you speak of is Abbot Galiani; all I\u2019ve read by him are excerpts of letters, but I\u2019m quite sure he had very little in common with Retz. In Mme d\u2019\u00c9pinay\u2019s entourage, there were only frivolous, skeptical people with low souls. While my coadjutor was first and foremost an honest man and a great soul, though that is somewhat hidden beneath the heap of adroitly intertwined intrigues. Today he might give the impression of a traitor, because in that happy period there were no political parties, and loyalty to an abstract idea, even a religious one, would have seemed utter foolishness. One was loyal to living human beings to whom one was bound by friendship, by commitments made, by the duty of protection or obedience, or by esteem. In that sense, the concern for loyalty and honor dominates all my coadjutor\u2019s intrigues. The concern for public good also dominates them. The sense of everything he did was a desperate attempt to destroy Richelieu\u2019s work; when he was defeated, something perished for all time. The beginning of the seventeenth century was, in France, Spain, and England, something extraordinarily luminous; an undefinable inspiration reached its peak here and perished all of a sudden, never to reappear. Personally, with the exception of Racine, I don\u2019t esteem anything that came after 1660 (to the present day) as much as what came before. I\u2019m not including Corneille, for whom I don\u2019t have much esteem in any respect. But have I told you about Th\u00e9ophile?<\/p>\n<blockquote><p>Les astres dont la bienveillance<br \/>\nSe sent forcer de ta vaillance<br \/>\nSont appr\u00eat\u00e9s pour t\u2019accueillir;<br \/>\nD\u00e9j\u00e0 leur splendeur t\u2019environne;<br \/>\nDieu comme fleurs les vient cueillir<br \/>\nPour t\u2019en donner une couronne<br \/>\nQui ne pourra jamais vieillir.<br \/>\n(<em>Ode \u00e0 Guillaume d\u2019Orange<\/em>)<\/p>\n<p>[The stars whose benevolence<br \/>\nFeels strengthened by your valor<br \/>\nAre ready to welcome you;<br \/>\nAlready their splendor surrounds you;<br \/>\nGod picks them like flowers<br \/>\nTo give you a crown of them<br \/>\nThat will never age.]<\/p><\/blockquote>\n<p>And this, on the civil war of 1620 (in which Richelieu was on the rebel side, by the way)<\/p>\n<blockquote><p>La campagne \u00e9tait allum\u00e9e<br \/>\nL\u2019air gros de bruit et de fum\u00e9e,<br \/>\nLe ciel confus de nos d\u00e9bats,<br \/>\nLe jour triste de notre gloire,<br \/>\nEt le sang fit rougir la Loire<br \/>\nDe la honte de vos combats.<\/p>\n<p>[The countryside was burning<br \/>\nThe air thick with noise and smoke,<br \/>\nThe sky chaotic with our disputes,<br \/>\nThe day sorrowful with our glory,<br \/>\nAnd blood made the Loire blush<br \/>\nWith shame for our battles.]<\/p><\/blockquote>\n<p>And doesn\u2019t this seem like the best of Val\u00e9ry?<\/p>\n<blockquote><p>Je sentis mon sang se geler<br \/>\nEt comme autour de moi voler<br \/>\nL\u2019ombre de ma douleur future.<em><br \/>\n<\/em><\/p>\n<p>[I felt my blood freeze<br \/>\nAnd as if around me there flew<br \/>\nThe shadow of my future pain.]<\/p><\/blockquote>\n<p>He too had that sense of friendship and that generosity of soul that hasn\u2019t been seen since that period. He wrote to Balzac: \u201cWhat acquires me friends and the envious is simply the easiness of my morals, an incorruptible loyalty and the open profession I make to love perfectly those who are without fraud and cowardice.\u201d<\/p>\n<p>Naturally, he was made to suffer horribly and die prematurely. If he\u2019d had a little baseness in his soul, he could have lived to a ripe old age, and would perhaps be regarded today as one of the two or three greatest French poets. Personally, I see Villon, Maurice Sc\u00e8ve, him, and Racine as above all the others, and by far.<\/p>\n<p>I\u2019m not sure that the discovery of incommensurables is a sufficient explanation for the Greeks\u2019 obstinate refusal of algebra. They must have known Babylonian algebra from the beginning. Tradition holds that Pythagoras traveled to Babylon to study there. Naturally, they transposed this algebra into geometry, long before Apollonius. Transpositions of this kind found in Apollonius probably concern quadratic equations; those of the second degree could all be solved once the properties of the triangle inscribed in the semicircle were known, a discovery attributed to Pythagoras.<\/p>\n<p>(This way one finds two quantities of which either the sum and product are known, or the difference and product.) But the singular thing is that this transposition of algebra into geometry seems not to be a side issue, but the very mainspring of geometric invention throughout the history of Greek geometry.<\/p>\n<p>The legend concerning Thales\u2019s discovery of the similarity of triangles (when a man\u2019s shadow is equal to the man, the pyramid\u2019s shadow is equal to the pyramid) relates this discovery to the problem of a proportion whose term is unknown.<\/p>\n<p>We know nothing of the following discovery, by Pythagoras, of the properties of the right triangle. But here is my hypothesis, which is certainly in keeping with the spirit of Pythagorean research. It is that this discovery comes from the problem of finding the mean proportional of two known quantities. Two similar triangles having two noncorresponding equal sides represent a proportion with three terms:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-168232 size-medium aligncenter\" src=\"https:\/\/www.theparisreview.org\/blog\/wp-content\/uploads\/2024\/07\/screenshot-2024-07-31-at-110042-300x122.png\" alt=\"\" width=\"300\" height=\"122\" srcset=\"https:\/\/www.theparisreview.org\/blog\/wp-content\/uploads\/2024\/07\/screenshot-2024-07-31-at-110042-300x122.png 300w, https:\/\/www.theparisreview.org\/blog\/wp-content\/uploads\/2024\/07\/screenshot-2024-07-31-at-110042-768x311.png 768w, https:\/\/www.theparisreview.org\/blog\/wp-content\/uploads\/2024\/07\/screenshot-2024-07-31-at-110042.png 952w\" sizes=\"auto, (min-width: 62.5em) 67vw, 100vw\" \/><\/p>\n<p>If the two extremes are constructed on a single straight line, the figure becomes a right triangle (since the angle between <em>a<\/em> and <em>b<\/em> becomes a straight angle, half of which is a right angle). The right triangle\u2019s essential property is that it is formed by the juxtaposition of two triangles similar to it and to each other. I think that Pythagoras discovered this property first. The right triangle also provides the solution to the opposite problem: if the mean proportional and the sum or difference of the extremes are known, find the extremes.<\/p>\n<p>As for conics and their properties, the inventor in this case is said to be Plato\u2019s student Menaechmus, one of the two geometers who solved the problem of doubling the cube posed by Apollo. (The other is Archytas; he\u00a0solved it with the torus.) Menaechmus solved this problem with conics (two parabolas, or a parabola and a hyperbola). So, it doesn\u2019t seem unlikely to me that he invented them for this purpose. And the problem of doubling the cube comes down to finding two mean proportionals between two known quantities.<\/p>\n<p>It\u2019s easy to imagine the process of the discovery. For the cone consists of a circle of variable diameter, and the parabola provides the series of all the mean proportionals between a fixed term and a variable one.<\/p>\n<p>So, there is a continuous series of problems: a proportion with four terms of which one unknown\u2014 a geometric progression with three terms of which the middle term is unknown\u2014a progression with four terms of which the two middle terms are unknown.<\/p>\n<p>Just as the right triangle\u2019s properties made it possible to solve second-degree problems, those of the conics made it possible to solve those of the third and fourth.<\/p>\n<p>Note that while we solve the equations by supposing that the expressions \u221a,\u221b, etc., have meaning, the Greeks gave them a meaning before tackling the equations of corresponding degree.<\/p>\n<p>Also note that the assimilation of the unknown to a variable goes back at least as far as Menaechmus, if not further. One can hardly suppose that the Babylonians, with their numerical equations, had this notion. The fifth-century Greeks had the notion of function and of representing functions by lines. The story of Menaechmus gives the impression that for them curves were a means of studying functions, rather than an object of study in their own right.<\/p>\n<p>In all this, one sees progress whose continuity is never interrupted by the crisis of incommensurables. To be sure, there was a crisis of incommensurables, and its impact was immense. The popularization of this discovery cast discredit on the notion of truth that endures to this day; it brought about, or at least contributed to bringing about the idea that one can equally demonstrate two contradictory theories; the Sophists spread this point of view among the masses, along with knowledge of an inferior quality, exclusively aimed at the conquest of power; starting in the late fifth century, it resulted in the demagogy and imperialism from which it is inseparable, with consequences that ruined Hellenic civilization; it is through this process (to which other factors such as the Greco-Persian Wars naturally contributed) that Roman weapons were finally able to kill Greece, without any possible resurrection. My conclusion is that the gods were right to have the Pythagorean guilty of divulging the discovery of incommensurables perish in a shipwreck.<\/p>\n<p>But I don\u2019t think there was a crisis among the geometers and philosophers. Pythagoreanism was ruined (insofar as it was) by something entirely different, namely the mass massacre of Pythagoreans in Magna Graecia. In fact the star pentagon, which represents a relation between incommensurables (the division of a line into extreme and mean ratio), was one of the Pythagoreans\u2019 symbols. But Archytas (one of the survivors) was a great geometer, and he was the teacher of Eudoxus, who is responsible for the theory of real numbers, the notion of limit, and the notion of integration as described in Euclid. There is nothing to suggest that when the Pythagoreans spoke of numbers, they only meant whole numbers. On the contrary, by saying that justice, etc., etc., are numbers, they made clear, it seems to me, that they were using this word to refer to any kind of proportion. They were certainly capable of conceiving of real numbers.<\/p>\n<p>In my opinion, the essential point of the discovery of incommensurables lies outside of geometry. It consists of the fact that certain problems concerning numbers can sometimes have a solution and sometimes be insoluble; for example, that of a mean proportional between two given numbers. That alone suffices to prove that the number in the narrow sense of the word is not the key to every thing. Now, when was this realized? I don\u2019t know if there is any information about this. In any case, it was possible to realize it before geometry; one merely needed to make a special study of problems of proportion. And in that case the geometric process to find mean proportionals (height of the right triangle) would immediately have appeared, as soon as it was discovered, as not being subject to any similar limitation. So much so that one can wonder if the Greeks might have studied the triangle to find proportions expressible other wise than in whole numbers, and if consequently they might have conceived of the line as a function from the start, as they later did with the parabola. One can find objections to this theory, but in my opinion they fall flat if one remembers the role secrecy played among Greek thinkers and their custom of only diffusing by distorting. The fact that Eudoxus is the creator of a perfect and completed theory of real numbers in no way rules out that the geometers could have glimpsed this notion from the beginning and constantly strived to grasp it.<\/p>\n<p>One might ask oneself why the Greeks were so committed to the study of proportion. It\u2019s certainly a question of religious preoccupation, and consequently (since we\u2019re talking about Greece) a partially aesthetic one. The link between mathematical preoccupations on the one hand and philosophical-religious ones on the other, a link that is historically known to have existed in Pythagoras\u2019s era, certainly goes back much further than that. For Plato is a traditionalist to the extreme and often says, \u201cthe ancients who were so much closer to the light than we are \u2026\u201d (obviously alluding to an Antiquity far more remote than that of Pythagoras); furthermore, he posted \u201cNo one enters here who is not a geometer\u201d at the door of the Academy and said, \u201cGod is ever a geometer.\u201d The two attitudes would be contradictory\u2014which cannot be\u2014if the preoccupations from which Greek geometry arose (if not the geometry itself) didn\u2019t date back to early Antiquity; one can suppose that they come either from the pre-Hellenic inhabitants of Greece, or from Egypt, or both. Furthermore, orphism (which has this dual origin) was such an inspiration to Pythagoreanism and Platonism (which are practically equivalent) that one can wonder if Pythagoras and Plato did much more than comment on it. Thales was almost certainly initiated into Greek and Egyptian mysteries, and was consequently steeped, from a philosophical and religious perspective, in an atmosphere similar to that of Pythagoreanism.<\/p>\n<p>I therefore think that the notion of proportion had been since quite a remote Antiquity the object of a meditation that constituted one of the processes for purifying the soul, perhaps the principal process. There can be no doubt that this notion was at the center of the Greeks\u2019 aesthetics, geometry, and philosophy.<\/p>\n<p>The Greeks\u2019 originality in terms of mathematics isn\u2019t, as I see it, their refusal to accept approximation. There is no approximation in the Babylonian problems, and for a very simple reason: it\u2019s because they are constructed from the solutions. Thus there are dozens (or hundreds, I don\u2019t remember) of fourth-degree problems with two unknowns that all have the same solution. This shows that the Babylonians were only interested in the method, and not in solving problems actually posed. Likewise, in the problem of the canal I mentioned to you, the sum of workers and workdays is obviously never given. They enjoyed supposing unknown what is given, and known what is not. It\u2019s a game, obviously, that does the greatest honor to their conception of \u201cdisinterested research\u201d (did they have scholarships and medals to stimulate them?). But it\u2019s only a game.<\/p>\n<p>This game must have seemed profane to the Greeks, or even impious; other wise why wouldn\u2019t they have translated the algebra treatises that must have existed in Babylonian at the same time that they transposed them into geometry? Diophantus\u2019s work could have been written many centuries earlier. But the Greeks did not see any value in a method of reasoning for its own sake, they valued it insofar as it allowed the effective study of concrete problems; not that they were avid for technical applications, but because their sole object was to conceive more and more clearly of an identity of structure between the human mind and the universe. Purity of soul was their only concern; \u201cimitating God\u201d was its secret; the study of mathematics helped to imitate God insofar as one saw the universe as subject to mathematical laws, which made the geometer an imitator of the supreme legislator. It\u2019s clear that the Babylonians\u2019 mathematical games, where the solution was given before the data, were useless to this end. What was needed was data actually provided by the world or action on the world; so what was needed was to find ratios that did not require the problems to be artificially prepared to \u201ccome out right,\u201d as is the case with whole numbers.<\/p>\n<p>It\u2019s for the Greeks that mathematics was truly an art. Its purpose was the same as the purpose of their art, namely to make perceptible a kinship between the human mind and the universe, to make the world appear as \u201cthe city of all rational beings.\u201d And it was really made of solid matter, matter that existed, like that of all the arts without exception, in the physical sense of the word; this matter was space actually given, imposed as a de facto condition to all of man\u2019s actions. Their geometry was a science of nature; their physics (I\u2019m thinking of the Pythagoreans\u2019 music, and especially of Archimedes\u2019 mechanics and his study of floating bodies) was a geometry in which the hypotheses were presented as postulates.<\/p>\n<p>I fear that today it is rather toward the Babylonian conception that we\u2019re moving, in other words playing games rather than making art. I wonder how many mathematicians today see mathematics as a process aimed at purifying the soul and \u201cimitating God\u201d? What\u2019s more, it seems to me that the matter is lacking. There is a lot of axiomatics, which seems to be closer to the Greeks, but aren\u2019t the axioms largely chosen at will? You speak of \u201csolid matter,\u201d but isn\u2019t this matter essentially formed by the entirety of mathematical work accomplished to this day? In that case, current mathematics would be a screen between man and the universe (and consequently between man and God, as understood by the Greeks) instead of putting them in contact. But perhaps I\u2019m disparaging it.<\/p>\n<p>Speaking of the Greeks, have you heard of a certain Autran, who has just published a book about Homer? He has put forward a sensational theory, namely that the Lycians and the Phoenicians of the second millennium <small>B.C.<\/small> were Dravidians. His arguments, which are philological, do not appear to be unworthy of interest, as much as one can judge without knowing the Dravidian languages and the inscriptions he quotes. But the theory is most appealing\u2014 too appealing, even\u2014in that it gives an extremely simple explanation of the analogies between Greek and Indian thought. Climate might be sufficient explanation for the differences. Be that as it may, how could one help feeling nostalgic for an era in which the same thought was found everywhere, among all the peoples, in all the countries, where ideas circulated over a prodigious expanse, and in which one enjoyed all the riches of diversity? Today, as under the Roman Empire, uniformity has descended upon every thing, erasing all the traditions, and at the same time ideas have practically stopped circulating. Well! Perhaps in a thousand years it will be a bit better.<\/p>\n<p style=\"text-align: right;\">Fraternally,<br \/>\nSimone<\/p>\n<p>&nbsp;<\/p>\n<p><em>Translated from the French by Nicholas Elliott.<\/em><\/p>\n<p><em>From\u00a0<\/em><a href=\"https:\/\/www.hup.harvard.edu\/books\/9780674292376\">A Life in Letters<\/a>,\u00a0<em>edited by Robert Chenavier and Andr\u00e9 A. Devaux in collaboration with Marie-No\u00eblle Chenavier-Jullien, Annette Devaux, and Olivier Rey and translated by Nicholas Elliott, to be published this month by the Bellknap Press of Harvard University Press.\u00a0<\/em><\/p>\n<p><em>Simone Weil (1909\u20131943) was a French philosopher, mystic, and political activist, widely considered one of the most original thinkers of the twentieth century.<\/em><\/p>\n<p><em>Robert Chenavier is president of the Association for the Study of Simone Weil\u2019s Thought and the author of four books, most recently<\/em>\u00a0Simone Weil, une Juive antis\u00e9mite?<\/p>\n<p><em>Andr\u00e9 A. Devaux (1921\u20132017) was a professor of philosophy at the Sorbonne.<\/em><\/p>\n<p style=\"font-weight: 400;\"><em>Nicholas Elliott<\/em> <em>is a writer and translator based in New York City. He has worked extensively in theatre in New York and France, is a contributing editor for film at <\/em>BOMB<em> magazine, and was the American correspondent for the French film magazine\u00a0<\/em>Cahiers du cin\u00e9ma<em>\u00a0from 2009 to 2020.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u201cI wonder how many mathematicians today see mathematics as a process aimed at purifying the soul and \u2018imitating God\u2019?\u201d<\/p>\n","protected":false},"author":2512,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[68530],"tags":[68789,67827,182,25358,11323],"class_list":["post-168230","post","type-post","status-publish","format-standard","hentry","category-letters","tag-andre-weil","tag-featured","tag-letters","tag-mathematics","tag-simone-weil"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.4 (Yoast 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