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Il est int\u00e9ressant de constater que cette structure g\u00e9om\u00e9trique se retrouve presque \u00e0 l’identique dans la nature, comme en t\u00e9moigne la photo ci-dessus \u00e0 droite d’une euphorbia tirucalli<\/em>, prise \u00e0 l’exposition ELK qui s’est tenue en septembre \u00e0 Blankenberge (Belgique). Cette manifestation annuelle rassemble des centaines d’exposants proposant aux passionn\u00e9s de cactus, plantes \u00e0 caudex,… des exemplaires rares dont chacun est un \u00e9merveillement et donne raison \u00e0 Buffon s’extasiant devant l’infinie vari\u00e9t\u00e9 des spectacles de la Nature.<\/p>\n","protected":false},"excerpt":{"rendered":"Le r\u00e9seau de Bethe, ou encore arbre de Cayley, est une arborescence sans boucle dont chaque n\u0153ud poss\u00e8de un nombre fixe (coordinance) de premiers voisins ; la figure montre \u00e0 gauche un arbre de coordinance 3. Cet objet a priori purement g\u00e9om\u00e9trique est la base d’un grand nombre de mod\u00e8les allant de la biophysique (r\u00e9activit\u00e9 … Continuer la lecture de R\u00e9seau de Bethe (arbre de Cayley)<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":9,"featured_media":531,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[99,6],"tags":[],"class_list":["post-513","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-loisirs","category-sciences"],"yoast_head":"\nR\u00e9seau de Bethe (arbre de Cayley), par Claude Aslangul<\/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:\/\/blogs.futura-sciences.com\/aslangul\/2014\/12\/01\/reseau-bethe\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"R\u00e9seau de Bethe (arbre de Cayley), par Claude Aslangul\" \/>\n<meta property=\"og:description\" content=\"Le r\u00e9seau de Bethe, ou encore arbre de Cayley, est une arborescence sans boucle dont chaque n\u0153ud poss\u00e8de un nombre fixe (coordinance) de premiers voisins ; la figure montre \u00e0 gauche un arbre de coordinance 3. Cet objet a priori purement g\u00e9om\u00e9trique est la base d’un grand nombre de mod\u00e8les allant de la biophysique (r\u00e9activit\u00e9 … Continuer la lecture de R\u00e9seau de Bethe (arbre de Cayley) →\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.futura-sciences.com\/aslangul\/2014\/12\/01\/reseau-bethe\/\" \/>\n<meta property=\"og:site_name\" content=\"PHYSMATIQUES, le blog de Claude ASLANGUL, physicien th\u00e9oricien\" \/>\n<meta property=\"article:published_time\" content=\"2014-12-01T14:57:45+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2015-04-17T20:24:54+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blogs.futura-sciences.com\/aslangul\/wp-content\/uploads\/sites\/10\/2014\/12\/CayleyBethe.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"429\" \/>\n\t<meta property=\"og:image:height\" content=\"322\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/aslangul\/2014\/12\/01\/reseau-bethe\/\",\"url\":\"https:\/\/blogs.futura-sciences.com\/aslangul\/2014\/12\/01\/reseau-bethe\/\",\"name\":\"R\u00e9seau de Bethe (arbre de Cayley), par Claude Aslangul\",\"isPartOf\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/aslangul\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/aslangul\/2014\/12\/01\/reseau-bethe\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/aslangul\/2014\/12\/01\/reseau-bethe\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blogs.futura-sciences.com\/aslangul\/wp-content\/uploads\/sites\/10\/2014\/12\/CayleyBethe.jpg\",\"datePublished\":\"2014-12-01T14:57:45+00:00\",\"dateModified\":\"2015-04-17T20:24:54+00:00\",\"author\":{\"@id\":\"\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/blogs.futura-sciences.com\/aslangul\/2014\/12\/01\/reseau-bethe\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/aslangul\/2014\/12\/01\/reseau-bethe\/#primaryimage\",\"url\":\"https:\/\/blogs.futura-sciences.com\/aslangul\/wp-content\/uploads\/sites\/10\/2014\/12\/CayleyBethe.jpg\",\"contentUrl\":\"https:\/\/blogs.futura-sciences.com\/aslangul\/wp-content\/uploads\/sites\/10\/2014\/12\/CayleyBethe.jpg\",\"width\":429,\"height\":322},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/aslangul\/#website\",\"url\":\"https:\/\/blogs.futura-sciences.com\/aslangul\/\",\"name\":\"PHYSMATIQUES, le blog de Claude ASLANGUL, physicien th\u00e9oricien\",\"description\":\""Si la vie est complexe, c'est parce qu'elle a une partie r\u00e9elle et une partie imaginaire." 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