{"id":70,"date":"2016-01-17T20:58:32","date_gmt":"2016-01-17T19:58:32","guid":{"rendered":"http:\/\/perso.ens-lyon.fr\/ghys\/?page_id=70"},"modified":"2025-04-27T18:17:43","modified_gmt":"2025-04-27T17:17:43","slug":"accueil","status":"publish","type":"page","link":"https:\/\/perso.ens-lyon.fr\/ghys\/accueil\/","title":{"rendered":"Accueil"},"content":{"rendered":"<div class=\"csRow\">\n<div class=\"csColumnGap\" style=\"margin: 0px; padding: 0px; float: left; width: 1.56%;\"><img decoding=\"async\" style=\"border: none;\" src=\"https:\/\/perso.ens-lyon.fr\/ghys\/wp-content\/plugins\/advanced-wp-columns\/assets\/js\/plugins\/views\/img\/1x1-pixel.png\" alt=\"\" \/><\/div>\n<div class=\"csColumn\" style=\"margin: 0px; padding: 0px; float: left; width: 43.6%;\" data-csstartpoint=\"15\" data-csendpoint=\"434\" data-cswidth=\"43.6%\" data-csid=\"cb338f05-cfe9-9bae-906c-cde5bffe5aed\">\n<p style=\"text-align: center;\"><div id=\"metaslider-id-1876\" style=\"width: 100%;\" class=\"ml-slider-3-99-0 metaslider metaslider-flex metaslider-1876 ml-slider ms-theme-default\" role=\"region\" aria-label=\"test\" data-width=\"700\">\n    <div id=\"metaslider_container_1876\">\n        <div id=\"metaslider_1876\" class=\"flexslider\">\n            <ul class='slides'>\n                <li style=\"display: block; width: 100%;\" class=\"slide-1878 ms-image \" aria-roledescription=\"slide\" data-date=\"2021-05-15 08:51:09\"><a href=\"https:\/\/www.odilejacob.fr\/catalogue\/sciences\/physique-chimie\/petite-histoire-des-flocons-de-neige_9782738154415.php\" target=\"_self\" aria-label=\"View Slide Details\" class=\"metaslider_image_link\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/perso.ens-lyon.fr\/ghys\/wp-content\/uploads\/2021\/02\/neige-350x500.jpg\" height=\"1000\" width=\"700\" alt=\"\" class=\"slider-1876 slide-1878 msDefaultImage\" title=\"neige\" \/><\/a><\/li>\n                <li style=\"display: none; width: 100%;\" class=\"slide-1880 ms-image \" aria-roledescription=\"slide\" data-date=\"2021-05-15 08:51:09\"><a href=\"http:\/\/perso.ens-lyon.fr\/ghys\/promenade#English\" target=\"_self\" aria-label=\"View Slide Details\" class=\"metaslider_image_link\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/perso.ens-lyon.fr\/ghys\/wp-content\/uploads\/2017\/08\/couv-397x568.jpg\" height=\"1000\" width=\"700\" alt=\"\" class=\"slider-1876 slide-1880 msDefaultImage\" title=\"couv\" \/><\/a><\/li>\n                <li style=\"display: none; width: 100%;\" class=\"slide-2588 ms-image \" aria-roledescription=\"slide\" data-date=\"2023-09-24 17:46:04\"><a href=\"https:\/\/www.cnrseditions.fr\/catalogue\/mathematiques\/la-theorie-du-chaos\/#:~:text=Il%20est%20inhabituel%20qu%27une,provoquer%20une%20tornade%20au%20Texas.\" target=\"_self\" aria-label=\"View Slide Details\" class=\"metaslider_image_link\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/perso.ens-lyon.fr\/ghys\/wp-content\/uploads\/2023\/09\/chaos-600x857.jpg\" height=\"1000\" width=\"700\" alt=\"\" class=\"slider-1876 slide-2588 msDefaultImage\" title=\"chaos\" \/><\/a><\/li>\n                <li style=\"display: none; width: 100%;\" class=\"slide-2491 ms-image \" aria-roledescription=\"slide\" data-date=\"2023-01-27 22:18:04\"><a href=\"https:\/\/www.odilejacob.fr\/catalogue\/sciences\/mathematiques\/petite-histoire-du-ballon-de-foot_9782415005443.php\" target=\"_self\" aria-label=\"View Slide Details\" class=\"metaslider_image_link\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/perso.ens-lyon.fr\/ghys\/wp-content\/uploads\/2023\/01\/foot-350x500.jpg\" height=\"1000\" width=\"700\" alt=\"\" class=\"slider-1876 slide-2491 msDefaultImage\" title=\"foot\" \/><\/a><\/li>\n                <li style=\"display: none; width: 100%;\" class=\"slide-2613 ms-image \" aria-roledescription=\"slide\" data-date=\"2023-10-03 20:33:18\"><a href=\"https:\/\/store.cassini.fr\/fr\/documents-essais-culture-scientifique\/148-une-singuliere-promenade-mathematique.html?search_query=ghys&amp;results=1\" target=\"_self\" aria-label=\"View Slide Details\" class=\"metaslider_image_link\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/perso.ens-lyon.fr\/ghys\/wp-content\/uploads\/2023\/10\/Sing-scaled-700x1000.jpg\" height=\"1000\" width=\"700\" alt=\"\" class=\"slider-1876 slide-2613 msDefaultImage\" title=\"Sing\" \/><\/a><\/li>\n                <li style=\"display: none; width: 100%;\" class=\"slide-1879 ms-image \" aria-roledescription=\"slide\" data-date=\"2021-05-15 08:51:09\"><a href=\"http:\/\/perso.ens-lyon.fr\/ghys\/promenade#Turkish\" target=\"_self\" aria-label=\"View Slide Details\" class=\"metaslider_image_link\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/perso.ens-lyon.fr\/ghys\/wp-content\/uploads\/2018\/04\/Gezinti-e1523614434408-444x635.jpg\" height=\"1000\" width=\"700\" alt=\"\" class=\"slider-1876 slide-1879 msDefaultImage\" title=\"Gezinti\" \/><\/a><\/li>\n                <li style=\"display: none; width: 100%;\" class=\"slide-1887 ms-image \" aria-roledescription=\"slide\" data-date=\"2021-05-15 09:26:27\"><a href=\"http:\/\/perso.ens-lyon.fr\/ghys\/promenade#Russian\" target=\"_self\" aria-label=\"View Slide Details\" class=\"metaslider_image_link\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/perso.ens-lyon.fr\/ghys\/wp-content\/uploads\/2021\/05\/PromenadeRusse-700x1000.jpg\" height=\"1000\" width=\"700\" alt=\"\" class=\"slider-1876 slide-1887 msDefaultImage\" title=\"PromenadeRusse\" \/><\/a><\/li>\n                <li style=\"display: none; width: 100%;\" class=\"slide-2046 ms-image \" aria-roledescription=\"slide\" data-date=\"2021-12-29 11:35:40\"><a href=\"http:\/\/perso.ens-lyon.fr\/ghys\/promenade#Arabic\" target=\"_self\" aria-label=\"View Slide Details\" class=\"metaslider_image_link\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/perso.ens-lyon.fr\/ghys\/wp-content\/uploads\/2021\/12\/PromenadeArabic-1-700x1000.jpg\" height=\"1000\" width=\"700\" alt=\"\" class=\"slider-1876 slide-2046 msDefaultImage\" title=\"PromenadeArabic\" \/><\/a><\/li>\n                <li style=\"display: none; width: 100%;\" class=\"slide-1997 ms-image \" aria-roledescription=\"slide\" data-date=\"2021-05-25 13:56:14\"><a href=\"http:\/\/perso.ens-lyon.fr\/ghys\/promenade#Portuguese\" target=\"_self\" aria-label=\"View Slide Details\" class=\"metaslider_image_link\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/perso.ens-lyon.fr\/ghys\/wp-content\/uploads\/2021\/05\/orestatijuca-1-700x1000.jpg\" height=\"1000\" width=\"700\" alt=\"\" class=\"slider-1876 slide-1997 msDefaultImage\" title=\"orestatijuca\" \/><\/a><\/li>\n            <\/ul>\n        <\/div>\n        \n    <\/div>\n<\/div><\/p>\n<\/div>\n<div class=\"csColumnGap\" style=\"margin: 0px; padding: 0px; float: left; width: 5.1%;\"><img decoding=\"async\" style=\"border: none;\" src=\"https:\/\/perso.ens-lyon.fr\/ghys\/wp-content\/plugins\/advanced-wp-columns\/assets\/js\/plugins\/views\/img\/1x1-pixel.png\" alt=\"\" \/><\/div>\n<div class=\"csColumn\" style=\"margin: 0px; padding: 0px; float: left; width: 49.7%;\" data-csstartpoint=\"483\" data-csendpoint=\"960\" data-cswidth=\"49.7%\" data-csid=\"af0a6761-aef0-d5d8-95bc-1be137f3296b\">\n<div style=\"margin-bottom: 1em;\"><span style=\"display: none;\">.<\/span><\/div>\n<p>Math\u00e9maticien,<\/p>\n<p>Directeur de recherche \u00e9m\u00e9rite\u00a0<a href=\"http:\/\/www.cnrs.fr\/\">CNRS<\/a>,<\/p>\n<p><a href=\"http:\/\/www.umpa.ens-lyon.fr\/\" class=\"broken_link\">Unit\u00e9 de Math\u00e9matiques Pures et Appliqu\u00e9es<\/a>,<\/p>\n<p><a href=\"http:\/\/www.ens-lyon.fr\">\u00c9cole Normale Sup\u00e9rieure de Lyon<\/a>.<\/p>\n<p>Secr\u00e9taire perp\u00e9tuel <a href=\"http:\/\/www.academie-sciences.fr\/fr\/\">Acad\u00e9mie des sciences<\/a>.<\/p>\n<p>G\u00e9om\u00e9trie, Topologie,<\/p>\n<p>Syst\u00e8mes dynamiques,\u00a0math\u00e9matiques&#8230;<\/p>\n<p><a href=\"mailto:etienne.ghys@ens-lyon.fr\">etienne.ghys@ens-lyon.fr<\/a><\/p>\n<p><a href=\"mailto:etienne.ghys@academie-sciences.fr\">etienne.ghys@academie-sciences.fr<\/a><\/p>\n<\/div>\n<\/div>\n\n\n<iframe allow=\"autoplay *; encrypted-media *; fullscreen *; clipboard-write\" frameborder=\"0\" height=\"450\" style=\"width:100%;max-width:660px;overflow:hidden;border-radius:10px;\" sandbox=\"allow-forms allow-popups allow-same-origin allow-scripts allow-storage-access-by-user-activation allow-top-navigation-by-user-activation\" src=\"https:\/\/embed.podcasts.apple.com\/us\/podcast\/petites-histoires-de-science\/id1675260085\"><\/iframe>\n\n\n\n<p>A singular mathematical promenade, <a href=\"https:\/\/perso.ens-lyon.fr\/ghys\/promenade#English\">English<\/a>, <a href=\"https:\/\/perso.ens-lyon.fr\/ghys\/promenade#Turkish\">Turkish<\/a>, <a href=\"https:\/\/perso.ens-lyon.fr\/ghys\/promenade#Russian\">Russian<\/a>, <a href=\"https:\/\/perso.ens-lyon.fr\/ghys\/promenade#Portuguese\">Portuguese<\/a>, <a href=\"https:\/\/perso.ens-lyon.fr\/ghys\/promenade#Arabic\">Arabic<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.odilejacob.fr\/catalogue\/sciences\/physique-chimie\/petite-histoire-des-flocons-de-neige_9782738154415.php\">La petite histoire des flocons de neige<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.odilejacob.fr\/catalogue\/sciences\/mathematiques\/petite-histoire-du-ballon-de-foot_9782415005443.php\">La petite histoire du ballon de foot<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.cnrseditions.fr\/catalogue\/mathematiques\/la-theorie-du-chaos\/#:~:text=Il%20est%20inhabituel%20qu%27une,provoquer%20une%20tornade%20au%20Texas.\">La th\u00e9orie du chaos<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.odilejacob.fr\/catalogue\/sciences\/mathematiques\/ma-petite-histoire-des-nombres_9782415011468.php\">Ma petite histoire des nombres<\/a><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>. Math\u00e9maticien, Directeur de recherche \u00e9m\u00e9rite\u00a0CNRS, Unit\u00e9 de Math\u00e9matiques Pures et Appliqu\u00e9es, \u00c9cole Normale Sup\u00e9rieure de Lyon. Secr\u00e9taire perp\u00e9tuel Acad\u00e9mie des sciences. G\u00e9om\u00e9trie, Topologie, Syst\u00e8mes dynamiques,\u00a0math\u00e9matiques&#8230; etienne.ghys@ens-lyon.fr etienne.ghys@academie-sciences.fr A singular mathematical promenade, English, Turkish, Russian, Portuguese, Arabic La petite histoire des flocons de neige La petite histoire du ballon de foot La th\u00e9orie du chaos &hellip; <a href=\"https:\/\/perso.ens-lyon.fr\/ghys\/accueil\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Accueil<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","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":""},"class_list":["post-70","page","type-page","status-publish","hentry"],"featured_image_src":null,"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Accueil - \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\/accueil\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Accueil - \u00c9tienne Ghys\" \/>\n<meta property=\"og:description\" content=\". Math\u00e9maticien, Directeur de recherche \u00e9m\u00e9rite\u00a0CNRS, Unit\u00e9 de Math\u00e9matiques Pures et Appliqu\u00e9es, \u00c9cole Normale Sup\u00e9rieure de Lyon. Secr\u00e9taire perp\u00e9tuel Acad\u00e9mie des sciences. 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Math\u00e9maticien, Directeur de recherche \u00e9m\u00e9rite\u00a0CNRS, Unit\u00e9 de Math\u00e9matiques Pures et Appliqu\u00e9es, \u00c9cole Normale Sup\u00e9rieure de Lyon. Secr\u00e9taire perp\u00e9tuel Acad\u00e9mie des sciences. 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