{"id":1638,"date":"2019-06-05T15:10:19","date_gmt":"2019-06-05T14:10:19","guid":{"rendered":"http:\/\/perso.ens-lyon.fr\/ghys\/?p=1638"},"modified":"2020-12-14T22:09:44","modified_gmt":"2020-12-14T21:09:44","slug":"ces-femmes-qui-ont-compte-dans-lombre","status":"publish","type":"post","link":"https:\/\/perso.ens-lyon.fr\/ghys\/2019\/06\/05\/ces-femmes-qui-ont-compte-dans-lombre\/","title":{"rendered":"Ces femmes qui ont compt\u00e9 dans l\u2019ombre"},"content":{"rendered":"\n<p><a href=\"https:\/\/www.lemonde.fr\/sciences\/article\/2019\/06\/05\/ces-femmes-qui-ont-compte-dans-l-ombre_5471924_1650684.html\">https:\/\/www.lemonde.fr\/sciences\/article\/2019\/06\/05\/ces-femmes-qui-ont-compte-dans-l-ombre_5471924_1650684.html<\/a><br><\/p>\n\n\n\n<p>\u00ab&nbsp;Carte blanche&nbsp;\u00bb. L\u2019un de mes articles scientifiques pr\u00e9f\u00e9r\u00e9s a \u00e9t\u00e9 \u00e9crit par Edward Lorenz, en&nbsp;1963, et s\u2019intitule \u00ab&nbsp;Deterministic Nonperiodic Flow&nbsp;\u00bb (flot d\u00e9terministe et non p\u00e9riodique). Il s\u2019agit de l\u2019un des textes fondateurs de la th\u00e9orie du chaos. Son contenu passera dans le grand public un peu plus tard \u00e0 travers la belle image de l\u2019effet papillon&nbsp;: un battement d\u2019ailes d\u2019un papillon au Br\u00e9sil pourrait engendrer un ouragan au Texas. Cette publication est un m\u00e9lange extraordinaire de physique, de m\u00e9t\u00e9orologie, de math\u00e9matiques et de simulations num\u00e9riques. Je l\u2019ai lue et relue un tr\u00e8s grand nombre de fois et je croyais la conna\u00eetre jusque la semaine derni\u00e8re.<\/p>\n\n\n\n<p>Un article de Joshua Sokol dans <a href=\"https:\/\/www.quantamagazine.org\/hidden-heroines-of-chaos-ellen-fetter-and-margaret-hamilton-20190520\/\" class=\"broken_link\"><em>Quanta Magazine<\/em><\/a> m\u2019a appris que j\u2019aurais d\u00fb lire le dernier paragraphe dans lequel l\u2019auteur remercie <em>\u00ab&nbsp;Miss Ellen Fetter qui a pris en charge les nombreux calculs et les graphiques&nbsp;\u00bb<\/em>. Comment&nbsp;? Ce n\u2019est pas Edward Lorenz qui a fait les calculs, mais une assistante&nbsp;? Il faut comprendre que simuler le mouvement de l\u2019atmosph\u00e8re sur un ordinateur \u00e9tait une composante essentielle de l\u2019article. En&nbsp;1963, les ordinateurs \u00e9taient primitifs et \u00ab&nbsp;prendre en charge les calculs&nbsp;\u00bb aurait probablement m\u00e9rit\u00e9 un peu plus qu\u2019un discret remerciement.<\/p>\n\n\n\n<p><strong>Calculs faits \u00e0 la main<\/strong><\/p>\n\n\n\n<p>Ce n\u2019est pas la premi\u00e8re fois que des scientifiques utilisent des \u00ab&nbsp;calculatrices f\u00e9minines&nbsp;\u00bb, dont les noms apparaissent au mieux dans les remerciements. Dix ans auparavant, Enrico Fermi, John Pasta et Stanislaw Ulam publiaient la premi\u00e8re simulation num\u00e9rique d\u2019un syst\u00e8me physique complexe. On peut consid\u00e9rer cet article comme la naissance d\u2019une nouvelle discipline de physique math\u00e9matique. Il s\u2019agissait d\u2019\u00e9tudier, sur un ordinateur, les vibrations d\u2019une cha\u00eene constitu\u00e9e d\u2019une soixantaine de ressorts \u00ab&nbsp;non lin\u00e9aires&nbsp;\u00bb.<\/p>\n\n\n\n<p>L\u00e0 encore, deux lignes discr\u00e8tes dans la publication remercient Miss Mary Tsingou pour <em>\u00ab&nbsp;la programmation efficace du probl\u00e8me et pour avoir effectu\u00e9 les calculs sur l\u2019ordinateur Maniac de Los Alamos&nbsp;\u00bb<\/em>, ce qui repr\u00e9sente pourtant une partie tr\u00e8s importante du travail. Ce n\u2019est qu\u2019en&nbsp;2008 que le physicien Thierry Dauxois lira ces deux lignes et proposera d\u2019appeler Fermi-Pasta-Ulam-Tsingou cette simulation num\u00e9rique. J\u2019aurais m\u00eame propos\u00e9 de respecter l\u2019ordre alphab\u00e9tique\u2026<\/p>\n\n\n\n<p>En remontant encore dans le temps, on arrive \u00e0 une p\u00e9riode o\u00f9 les calculs \u00e9taient faits \u00e0 la main, et o\u00f9 la main en question \u00e9tait bien souvent f\u00e9minine. Dans les ann\u00e9es 1940, un membre d\u2019un institut de math\u00e9matiques appliqu\u00e9es ose parler du <em>kilogirl<\/em> (kilofille)&nbsp;: la quantit\u00e9 de calculs qu\u2019une femme peut produire en mille heures&nbsp;! Vers 1880, l\u2019astronome Edward Charles Pickering recrute, \u00e0 Harvard (Massachusetts), une \u00e9quipe de plus de 80&nbsp;calculatrices f\u00e9minines surnomm\u00e9es \u00ab&nbsp;harem de Pickering&nbsp;\u00bb et pay\u00e9es moins qu\u2019un ouvrier.<\/p>\n\n\n\n<p>On sait que la com\u00e8te de Halley est visible dans le ciel \u00e0 peu pr\u00e8s tous les soixante-seize ans. Sa trajectoire est perturb\u00e9e par l\u2019attraction de Jupiter et de Saturne. Au milieu du XVIII<sup>e&nbsp;<\/sup>si\u00e8cle, certains savants doutaient encore de la th\u00e9orie de la gravitation de Newton. Le calcul de la date du retour de la com\u00e8te fut un grand moment de l\u2019histoire des sciences. <a href=\"http:\/\/www.clairaut.com\/n15novembre1758po1pf.html\" class=\"broken_link\">En novembre&nbsp;1758, l\u2019acad\u00e9micien Alexis Clairaut annonce un retour <em>\u00ab&nbsp;vers le mois d\u2019avril de l\u2019ann\u00e9e prochaine&nbsp;\u00bb<\/em>. <\/a>Ce fut un triomphe quand sa pr\u00e9diction se r\u00e9alisa. La th\u00e9orie est en effet due \u00e0 Clairaut, mais les calculs monstrueux ont \u00e9t\u00e9 effectu\u00e9s par Joseph Lalande et Nicole-Reine Lepaute qui <em>\u00ab&nbsp;calculaient depuis le matin jusqu\u2019au soir, parfois m\u00eame \u00e0 table&nbsp;\u00bb<\/em>. Clairaut \u00ab&nbsp;oubliera&nbsp;\u00bb de remercier sa collaboratrice. La Ville de Paris rendra partiellement justice \u00e0 Nicole-Reine, en&nbsp;2007, en donnant son nom \u00e0 une rue.<\/p>\n\n\n\n<p>En&nbsp;2017, l\u2019ing\u00e9nieur de Google James Damore a \u00e9t\u00e9 renvoy\u00e9 apr\u00e8s avoir affirm\u00e9 que le manque d\u2019informaticiennes \u00e9tait d\u2019origine biologique.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>https:\/\/www.lemonde.fr\/sciences\/article\/2019\/06\/05\/ces-femmes-qui-ont-compte-dans-l-ombre_5471924_1650684.html \u00ab&nbsp;Carte blanche&nbsp;\u00bb. L\u2019un de mes articles scientifiques pr\u00e9f\u00e9r\u00e9s a \u00e9t\u00e9 \u00e9crit par Edward Lorenz, en&nbsp;1963, et s\u2019intitule \u00ab&nbsp;Deterministic Nonperiodic Flow&nbsp;\u00bb (flot d\u00e9terministe et non p\u00e9riodique). Il s\u2019agit de l\u2019un des textes fondateurs de la th\u00e9orie du chaos. Son contenu passera dans le grand public un peu plus tard \u00e0 travers la belle image de &hellip; <a href=\"https:\/\/perso.ens-lyon.fr\/ghys\/2019\/06\/05\/ces-femmes-qui-ont-compte-dans-lombre\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Ces femmes qui ont compt\u00e9 dans l\u2019ombre<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","ub_ctt_via":"","_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"episode_type":"","audio_file":"","cover_image":"","cover_image_id":"","duration":"","filesize":"","date_recorded":"","explicit":"","block":"","itunes_episode_number":"","itunes_title":"","itunes_season_number":"","itunes_episode_type":"","filesize_raw":"","footnotes":""},"categories":[57],"tags":[],"class_list":["post-1638","post","type-post","status-publish","format-standard","hentry","category-le-monde"],"featured_image_src":null,"author_info":{"display_name":"ghys","author_link":"https:\/\/perso.ens-lyon.fr\/ghys\/author\/ghys\/"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Ces femmes qui ont compt\u00e9 dans l\u2019ombre - \u00c9tienne Ghys<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/perso.ens-lyon.fr\/ghys\/2019\/06\/05\/ces-femmes-qui-ont-compte-dans-lombre\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ces femmes qui ont compt\u00e9 dans l\u2019ombre - \u00c9tienne Ghys\" \/>\n<meta property=\"og:description\" content=\"https:\/\/www.lemonde.fr\/sciences\/article\/2019\/06\/05\/ces-femmes-qui-ont-compte-dans-l-ombre_5471924_1650684.html \u00ab&nbsp;Carte blanche&nbsp;\u00bb. L\u2019un de mes articles scientifiques pr\u00e9f\u00e9r\u00e9s a \u00e9t\u00e9 \u00e9crit par Edward Lorenz, en&nbsp;1963, et s\u2019intitule \u00ab&nbsp;Deterministic Nonperiodic Flow&nbsp;\u00bb (flot d\u00e9terministe et non p\u00e9riodique). Il s\u2019agit de l\u2019un des textes fondateurs de la th\u00e9orie du chaos. 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L\u2019un de mes articles scientifiques pr\u00e9f\u00e9r\u00e9s a \u00e9t\u00e9 \u00e9crit par Edward Lorenz, en&nbsp;1963, et s\u2019intitule \u00ab&nbsp;Deterministic Nonperiodic Flow&nbsp;\u00bb (flot d\u00e9terministe et non p\u00e9riodique). Il s\u2019agit de l\u2019un des textes fondateurs de la th\u00e9orie du chaos. Son contenu passera dans le grand public un peu plus tard \u00e0 travers la belle image de\u2026","_links":{"self":[{"href":"https:\/\/perso.ens-lyon.fr\/ghys\/wp-json\/wp\/v2\/posts\/1638","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/perso.ens-lyon.fr\/ghys\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/perso.ens-lyon.fr\/ghys\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/perso.ens-lyon.fr\/ghys\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/perso.ens-lyon.fr\/ghys\/wp-json\/wp\/v2\/comments?post=1638"}],"version-history":[{"count":5,"href":"https:\/\/perso.ens-lyon.fr\/ghys\/wp-json\/wp\/v2\/posts\/1638\/revisions"}],"predecessor-version":[{"id":1783,"href":"https:\/\/perso.ens-lyon.fr\/ghys\/wp-json\/wp\/v2\/posts\/1638\/revisions\/1783"}],"wp:attachment":[{"href":"https:\/\/perso.ens-lyon.fr\/ghys\/wp-json\/wp\/v2\/media?parent=1638"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/perso.ens-lyon.fr\/ghys\/wp-json\/wp\/v2\/categories?post=1638"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/perso.ens-lyon.fr\/ghys\/wp-json\/wp\/v2\/tags?post=1638"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}