{"id":187362,"date":"2017-02-21T10:16:00","date_gmt":"2017-02-21T10:16:00","guid":{"rendered":"https:\/\/www.webdo.tn\/fr\/blog\/lequation-de-reine-didon-fondatrice-de-carthage-inspire-maths\/187362\/"},"modified":"2017-02-21T10:16:00","modified_gmt":"2017-02-21T10:16:00","slug":"lequation-de-reine-didon-fondatrice-de-carthage-inspire-maths","status":"publish","type":"post","link":"https:\/\/www.webdo.tn\/fr\/actualite\/chroniques\/lequation-de-reine-didon-fondatrice-de-carthage-inspire-maths\/187362\/","title":{"rendered":"L&rsquo;\u00e9quation de la reine Didon ou comment la fondatrice de Carthage inspire les maths !"},"content":{"rendered":"<p>Nous connaissons tous la l\u00e9gende d&rsquo;Elyssa-Didon. Fuyant Tyr, la reine ph\u00e9nicienne est parvenue avec ses vaisseaux jusqu&rsquo;au golfe de Tunis.<\/p>\n<p>Demandant asile aux autochtones, elle ne parvint \u00e0 obtenir qu&rsquo;une surface que pourrait recouvrir la peau d&rsquo;un b\u0153uf.<\/p>\n<p>Toutefois, pleine de ressources, la reine Didon allait d\u00e9couper cette peau en des lani\u00e8res si fines qu&rsquo;elle obtiendra une longueur \u00e9valu\u00e9e \u00e0 4000 m\u00e8tres.<\/p>\n<p>Avec la corde ainsi obtenue, elle allait encercler et d\u00e9limiter ce qui deviendra le tout premier territoire de Carthage.<\/p>\n<p>L&rsquo;id\u00e9e de former un cercle plut\u00f4t qu&rsquo;une autre figure g\u00e9om\u00e9trique ferm\u00e9e (comme le carr\u00e9 ou le rectangle voire le triangle) fait de Didon une math\u00e9maticienne de valeur.<\/p>\n<p>En effet, la reine de Carthage avait pressenti ce que les math\u00e9matiques analyseront et expliqueront.<\/p>\n<p>Didon avait en quelque sorte anticip\u00e9 le r\u00e9sultat isop\u00e9rim\u00e9trique selon lequel \u00ab\u00a0de toutes les courbes ferm\u00e9es sans point double, de longueur donn\u00e9e, celle qui entoure l&rsquo;aire la plus grande est le cercle.\u00a0\u00bb<\/p>\n<p>Ce r\u00e9sultat admis par Didon a en effet \u00e9t\u00e9 prouv\u00e9 dans le cadre du calcul des variations.<br \/>\nAujourd&rsquo;hui, les math\u00e9maticiens parlent d&rsquo;\u00e9quation de la reine Didon ou de Probl\u00e8me de Didon.<\/p>\n<p>Ainsi, en voulant se r\u00e9server un acc\u00e8s \u00e0 la mer, Didon a trac\u00e9 un arc de cercle, ce qui constitue la solution isop\u00e9rim\u00e9trique des courbes non ferm\u00e9es.<\/p>\n<p>En ce sens, le ratio aire-p\u00e9rim\u00e8tre est le plus simple quand il s&rsquo;agit du cercle, la sph\u00e8re \u00e9tant la surfa ce qui a le plus gros volume int\u00e9rieur.<\/p>\n<p>Didon a donc r\u00e9solu un probl\u00e8me isop\u00e9rim\u00e9trique c&rsquo;est \u00e0 dire qu&rsquo;elle a maximis\u00e9 une aire pour un p\u00e9rim\u00e8tre donn\u00e9. Les math\u00e9maticiens parleront de multiplicateur de Lagrange ou d&rsquo;\u00e9quation Euler-Lagrange.<\/p>\n<p>Ne se contentant pas d&rsquo;\u00eatre une reine math\u00e9maticienne, Didon a \u00e9galement fond\u00e9 sa nouvelle cit\u00e9 de Carthage sous le signe de la transaction. Car l&rsquo;achat d&rsquo;un terrain n&rsquo;est en aucun cas le recours \u00e0 la guerre ou la conqu\u00eate de territoire et structure une d\u00e9marche pacifique.<\/p>\n<p>Nous n&rsquo;avons pas fini de d\u00e9couvrir les multiples ressorts de la reine Didon&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>L&rsquo;\u00e9quation de la reine Didon ou comment la fondatrice de Carthage inspire les maths !<\/p>\n","protected":false},"author":3229,"featured_media":326232,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2596],"tags":[2600],"class_list":["post-187362","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chroniques","tag-guerre"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>L&#039;\u00e9quation de la reine Didon 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