{"id":40,"date":"2023-04-19T17:58:33","date_gmt":"2023-04-19T17:58:33","guid":{"rendered":"https:\/\/www.prepaplus.tv\/blog\/?p=40"},"modified":"2023-04-19T17:58:33","modified_gmt":"2023-04-19T17:58:33","slug":"Methode-explications-de-la-resolution-par-recurrence","status":"publish","type":"post","link":"https:\/\/www.prepaplus.tv\/blog\/Methode-explications-de-la-resolution-par-recurrence\/","title":{"rendered":"M\u00e9thode : les explications de la r\u00e9solution par r\u00e9currence"},"content":{"rendered":"\n<p id=\"docs-internal-guid-86b9c3ca-7fff-26c4-099f-5c3a04d9e99b\" class=\"wp-block-paragraph\">La <strong>r\u00e9solution par r\u00e9currence<\/strong> est une m\u00e9thode que vous apprenez en premi\u00e8re ann\u00e9e de classe pr\u00e9paratoire. La r\u00e9currence est une <strong>m\u00e9thode classique qui tombe fr\u00e9quemment aux concours.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u2019est pourquoi vous retrouverez toutes les explications concernant la r\u00e9solution par r\u00e9currence et ses sp\u00e9cificit\u00e9s dans cet article&nbsp;!<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><br><br><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les sp\u00e9cificit\u00e9s de la r\u00e9solution par r\u00e9currence<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Le but de la r\u00e9currence est de <strong>montrer qu\u2019une proposition est vraie pour l\u2019ensemble des termes d\u2019un ensemble ou d\u2019un intervalle<\/strong><strong>.<\/strong> Pour montrer cela, la m\u00e9thode de la r\u00e9currence se constitue de trois \u00e9tapes&nbsp;:&nbsp;<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n\n\n\n<li>\n<strong>L\u2019initialisation<\/strong>\n<\/li>\n\n\n\n\n\n\n<li>\n<strong>L\u2019h\u00e9r\u00e9dit\u00e9<\/strong>\n<\/li>\n\n\n\n\n\n\n<li>\n<strong>La conclusion<\/strong>\n<\/li>\n\n\n\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Avant de commencer la r\u00e9currence, il vous faut \u00e9noncer ce que vous souhaitez montrer \u00e0 travers cette m\u00e9thode.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Exemple de phrase d\u2019introduction \u00e0 la r\u00e9solution par r\u00e9currence&nbsp;: Montrons par r\u00e9currence, pour tout n \u2208 \u2115, que P(n)&nbsp;: \u00ab la proposition que vous souhaitez montrer&nbsp;\u00bb est vraie.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Voyons maintenant la m\u00e9thode pour chacune des \u00e9tapes de la r\u00e9currence.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tout d\u2019abord <strong>l\u2019initialisation<\/strong>, le but de l\u2019initialisation est de <strong>montrer que la proposition est vraie pour le premier terme de l\u2019ensemble, de l\u2019intervalle.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En reprenant l\u2019exemple plus haut, puisque notre ensemble de d\u00e9finition est \u2115, le premier terme pour lequel nous allons montrer que la proposition est vraie est 0.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Autre <strong>exemple<\/strong>&nbsp;: Si l\u2019ensemble de d\u00e9finition \u00e9tait \u2115*, alors le premier terme pour lequel il faut montrer que la proposition est vraie serait 1.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Maintenant que vous avez montr\u00e9 l\u2019initialisation, vient l\u2019\u00e9tape la plus compliqu\u00e9e de la r\u00e9currence, <strong>l\u2019h\u00e9r\u00e9dit\u00e9<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le but de l\u2019h\u00e9r\u00e9dit\u00e9 est de <strong>montrer que si la proposition est vraie pour un terme n, quelconque, alors la proposition est aussi vraie pour le terme suivant, donc vraie pour n+1.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Exemple<\/strong> d\u2019introduction \u00e0 l\u2019h\u00e9r\u00e9dit\u00e9&nbsp;: Soit n \u2208 \u2115, supposons que P(n) est vraie, montrons maintenant que P(n+1)&nbsp;:&nbsp;\u00ab&nbsp;La proposition en n+1&nbsp;\u00bb est vraie.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Attention \u00e0 bien sp\u00e9cifier la proposition en n+1 et \u00e0 ne pas se tromper dans son \u00e9criture&nbsp;!!<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dans l\u2019h\u00e9r\u00e9dit\u00e9, vous devrez utiliser \u00e0 un certain moment le <strong>principe de r\u00e9currence<\/strong>, c\u2019est-\u00e0-dire utiliser le fait que la proposition P(n) soit vraie pour arriver \u00e0 P(n+1) soit par des implications, soit par des \u00e9quivalences.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Attention, lorsque vous utilisez ce principe, il est primordial que vous l\u2019\u00e9nonciez avec une phrase \u00e0 droite des implications \/ \u00e9quivalence. Par exemple&nbsp;: \u00e0 droite des implications \/ \u00e9quivalences \u00ab&nbsp;Par principe de r\u00e9currence&nbsp;\u00bb.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nous voil\u00e0 maintenant arriv\u00e9 \u00e0 la derni\u00e8re \u00e9tape de la r\u00e9solution, <strong>qui est la plus simple la <\/strong><strong>conclusion.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Vous avez, avant d\u2019arriver \u00e0 la conclusion, montrer l\u2019initialisation et l\u2019h\u00e9r\u00e9dit\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Il vous fait maintenant conclure quant \u00e0 cette r\u00e9solution par r\u00e9currence.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Exemple<\/strong> de conclusion \u00e0 la r\u00e9currence&nbsp;: Par principe de r\u00e9currence, nous avons montr\u00e9 que pour tout n \u2208 \u2115, que P(n)&nbsp;: \u00ab la proposition que vous souhaitez montrer&nbsp;\u00bb.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><br><br><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Dans quelles situations utilise-t-on la r\u00e9solution par r\u00e9currence&nbsp;?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Maintenant que vous connaissez chacune des \u00e9tapes de la r\u00e9currence, il vous faut maintenant savoir dans quelle situation l\u2019utiliser&nbsp;!<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Comme nous l\u2019avons dit, <strong>la r\u00e9solution par r\u00e9currence sert \u00e0 montrer qu\u2019une proposition est vraie pour tous les termes d\u2019un ensemble ou d\u2019un intervalle.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lorsque vous voyez ce type de question&nbsp;: Montrer que pour tout n \u2208 \u2115, \u2026 Souvent s\u2019il n\u2019y a pas de m\u00e9thode simple pour montrer la proposition, une r\u00e9solution par r\u00e9currence s\u2019impose.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Par exemple, dans un exercice, vous avez une suite Un, quelconque, sa relation de r\u00e9currence, o\u00f9 Un+1 exprim\u00e9 en fonction de Un, et son premier terme U0. On vous demande alors de montrer que cette suite Un avec n d\u00e9finie sur \u2115 est strictement positif. <br>Dans ce cas, le meilleur moyen de montrer cela est d\u2019utiliser la r\u00e9solution par r\u00e9currence.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><br><br><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">R\u00e9sum\u00e9<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n\n\n\n<li>\nLa r\u00e9solution par r\u00e9currence se compose de trois \u00e9tapes&nbsp;: <strong>Initialisation, H\u00e9r\u00e9dit\u00e9 et Conclusion<\/strong>\n<\/li>\n\n\n\n\n\n\n<li>\nElle sert \u00e0 <strong>montrer qu\u2019une proposition est vraie pour tous les termes d\u2019un ensemble ou d\u2019un intervalle<\/strong>\n<\/li>\n\n\n\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>&nbsp; &nbsp; &nbsp;&nbsp;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lire plus :&nbsp;<a href=\"https:\/\/www.prepaplus.tv\/blog\/34\/Methode-reussir-raisonnement-par-l-absurde\">M\u00e9thode r\u00e9ussir un raisonnement par l\u2019absurde&nbsp;<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>La r\u00e9solution par r\u00e9currence est une m\u00e9thode que vous apprenez en premi\u00e8re ann\u00e9e de classe pr\u00e9paratoire. La r\u00e9currence est une m\u00e9thode classique qui tombe fr\u00e9quemment aux concours.<\/p>\n","protected":false},"author":2,"featured_media":109,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[5],"tags":[],"class_list":["post-40","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cours-maths-prepa-ecg"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>M\u00e9thode : les explications de la r\u00e9solution par r\u00e9currence  - Pr\u00e9pa +<\/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:\/\/www.prepaplus.tv\/blog\/Methode-explications-de-la-resolution-par-recurrence\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"M\u00e9thode : les explications de la r\u00e9solution par r\u00e9currence  - Pr\u00e9pa +\" \/>\n<meta property=\"og:description\" content=\"La r\u00e9solution par r\u00e9currence est une m\u00e9thode que vous apprenez en premi\u00e8re ann\u00e9e de classe pr\u00e9paratoire. 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