{"id":7446,"date":"2015-07-19T09:00:00","date_gmt":"2015-07-19T07:00:00","guid":{"rendered":"https:\/\/smalltalks.eu\/blog\/?p=7446"},"modified":"2026-10-16T16:30:55","modified_gmt":"2026-10-16T14:30:55","slug":"le-billard-elliptique-numberphile","status":"publish","type":"post","link":"https:\/\/smalltalks.eu\/blog\/2015\/07\/19\/le-billard-elliptique-numberphile\/","title":{"rendered":"Le billard elliptique (Numberphile)"},"content":{"rendered":"\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"The Elliptical Pool Table - Numberphile\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/4KHCuXN2F3I?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Sur un billard en forme d&#8217;ellipse, une bille lanc\u00e9e depuis un foyer, dans n&#8217;importe quelle direction, rebondit vers l&#8217;autre foyer, o\u00f9 se trouve le trou. Une propri\u00e9t\u00e9 des ellipses, d\u00e9montr\u00e9e sur le tapis (en anglais).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le m\u00eame principe, vu dans une cocotte elliptique : les ondes parties d&#8217;un foyer se concentrent sur l&#8217;autre.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Vid\u00e9o de Numberphile, rep\u00e9r\u00e9e sur X (<a href=\"https:\/\/x.com\/cirzen\/status\/1242616373018267650\">post de @cirzen<\/a>).<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sur un billard en forme d&#8217;ellipse, une bille lanc\u00e9e depuis un foyer, dans n&#8217;importe quelle direction, rebondit vers l&#8217;autre foyer, o\u00f9 se trouve le trou. Une propri\u00e9t\u00e9 des ellipses, d\u00e9montr\u00e9e sur le tapis (en anglais). Le m\u00eame principe, vu dans une cocotte elliptique : les ondes parties d&#8217;un foyer se concentrent sur l&#8217;autre. Vid\u00e9o de Numberphile, rep\u00e9r\u00e9e sur X (post de @cirzen).<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[280,282],"tags":[],"class_list":["post-7446","post","type-post","status-publish","format-standard","hentry","category-sciences","category-sciences-mathematiques"],"_links":{"self":[{"href":"https:\/\/smalltalks.eu\/blog\/wp-json\/wp\/v2\/posts\/7446","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/smalltalks.eu\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/smalltalks.eu\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/smalltalks.eu\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/smalltalks.eu\/blog\/wp-json\/wp\/v2\/comments?post=7446"}],"version-history":[{"count":1,"href":"https:\/\/smalltalks.eu\/blog\/wp-json\/wp\/v2\/posts\/7446\/revisions"}],"predecessor-version":[{"id":7476,"href":"https:\/\/smalltalks.eu\/blog\/wp-json\/wp\/v2\/posts\/7446\/revisions\/7476"}],"wp:attachment":[{"href":"https:\/\/smalltalks.eu\/blog\/wp-json\/wp\/v2\/media?parent=7446"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/smalltalks.eu\/blog\/wp-json\/wp\/v2\/categories?post=7446"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/smalltalks.eu\/blog\/wp-json\/wp\/v2\/tags?post=7446"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}