{"id":57,"date":"2024-02-03T12:00:00","date_gmt":"2024-02-03T11:00:00","guid":{"rendered":"https:\/\/www.maths-sup.com\/?p=57"},"modified":"2024-02-03T18:30:53","modified_gmt":"2024-02-03T17:30:53","slug":"introduction-aux-series-entieres","status":"publish","type":"post","link":"https:\/\/www.maths-sup.com\/index.php\/2024\/02\/03\/introduction-aux-series-entieres\/","title":{"rendered":"Introduction aux S\u00e9ries enti\u00e8res"},"content":{"rendered":"\n<p>Les <strong>s\u00e9ries enti\u00e8res<\/strong> constituent une cat\u00e9gorie essentielle dans l&rsquo;univers des <strong>s\u00e9ries de fonctions<\/strong>.<br>Elles jouent un r\u00f4le crucial dans de nombreux domaines des math\u00e9matiques.<\/p>\n\n\n\n<p>Cet article vise \u00e0 pr\u00e9senter les concepts fondamentaux des s\u00e9ries enti\u00e8res, en s&rsquo;adressant particuli\u00e8rement \u00e0 ceux qui souhaitent apprendre avec un minimum de pr\u00e9requis.<\/p>\n\n\n\n<p>Dans cet article, nous pr\u00e9sentons toutes les notions importantes \u00e0 conna\u00eetre sur les <strong>s\u00e9ries enti\u00e8res.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Qu&rsquo;est-ce qu&rsquo;une s\u00e9rie enti\u00e8re?<\/strong><\/h2>\n\n\n\n<p>Pour comprendre les <strong>s\u00e9ries enti\u00e8res<\/strong>, il est essentiel de rappeler d&rsquo;abord ce qu&rsquo;est une <strong>s\u00e9rie de fonctions<\/strong>.<\/p>\n\n\n\n<p>Une <strong>s\u00e9rie de fonctions<\/strong> est la donn\u00e9e de deux suites de fonctions <span class=\"katex-eq\" data-katex-display=\"false\">(S_n)_{n \\in \\mathbb{N}}<\/span> et <span class=\"katex-eq\" data-katex-display=\"false\">(u_n)_{n \\in \\mathbb{N}}<\/span> telles que:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><span class=\"katex-eq\" data-katex-display=\"false\">\\displaystyle \\forall N \\in \\mathbb{N}, \\forall x, \\quad S_N(x) = \\sum_{n=0}^N u_n(x)<\/span><\/p>\n\n\n\n<p>En g\u00e9n\u00e9ral, on consid\u00e8re des s\u00e9ries de fonctions d\u00e9finies de <span class=\"katex-eq\" data-katex-display=\"false\">\\mathbb{R}<\/span> vers <span class=\"katex-eq\" data-katex-display=\"false\">\\mathbb{R}<\/span> ou bien <span class=\"katex-eq\" data-katex-display=\"false\">\\mathbb{C}<\/span> vers <span class=\"katex-eq\" data-katex-display=\"false\">\\mathbb{C}<\/span>, auquel cas on note parfois la variable <span class=\"katex-eq\" data-katex-display=\"false\">z<\/span>.<br>On appelle <span class=\"katex-eq\" data-katex-display=\"false\">(u_n)_{n \\in \\mathbb{N}}<\/span> <strong>le terme g\u00e9n\u00e9ral de la s\u00e9rie<\/strong>.<br>Une s\u00e9rie de terme g\u00e9n\u00e9ral <span class=\"katex-eq\" data-katex-display=\"false\">(u_n)_{n \\in \\mathbb{N}}<\/span> est plus souvent not\u00e9e de mani\u00e8re synth\u00e9tique : <span class=\"katex-eq\" data-katex-display=\"false\">\\sum u_n<\/span> ou <span class=\"katex-eq\" data-katex-display=\"false\">\\sum u_n(x)<\/span>.<\/p>\n\n\n\n<p><strong>D\u00e9finition d&rsquo;une s\u00e9rie enti\u00e8re:<\/strong><br>Une <strong>s\u00e9rie enti\u00e8re<\/strong> est une s\u00e9rie de fonctions de la forme:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><span class=\"katex-eq\" data-katex-display=\"false\">\\displaystyle \\sum_{n \\in \\mathbb{N}} a_n x^n,<\/span><\/p>\n\n\n\n<p>avec <span class=\"katex-eq\" data-katex-display=\"false\">(a_n)_{n \\in \\mathbb{N}}<\/span> une suite de <span class=\"katex-eq\" data-katex-display=\"false\">\\mathbb{R}<\/span> ou de <span class=\"katex-eq\" data-katex-display=\"false\">\\mathbb{C}<\/span>.<\/p>\n\n\n\n<p>Une s\u00e9rie enti\u00e8re est donc en quelque sorte un \u00ab\u00a0polyn\u00f4me de degr\u00e9 infinie\u00a0\u00bb.<\/p>\n\n\n\n\n\n\n\n<h2 class=\"wp-block-heading\">Convergence d&rsquo;une s\u00e9rie enti\u00e8re<\/h2>\n\n\n\n<p>Lorsqu&rsquo;on a une s\u00e9rie ou une suite de fonctions, il est important de conna\u00eetre <strong>sa convergence<\/strong>.<\/p>\n\n\n\n<p>Le lemme suivant est premier r\u00e9sultat fondamental sur la <strong>convergence des s\u00e9ries enti\u00e8res<\/strong>.<\/p>\n\n\n\n<p><strong>Lemme d&rsquo;Abel:<\/strong><br>Soit <span class=\"katex-eq\" data-katex-display=\"false\">\\sum_{n \\in \\mathbb{N}} a_n x^n,<\/span> une s\u00e9rie enti\u00e8re \u00e0 valeurs dans <span class=\"katex-eq\" data-katex-display=\"false\">\\mathbb{R}<\/span>.<br>Soit <span class=\"katex-eq\" data-katex-display=\"false\">R&gt;0<\/span>. On suppose que la suite <span class=\"katex-eq\" data-katex-display=\"false\">(|a_n| \\cdot R^n)_{n}<\/span> est born\u00e9e.<br>Alors pour tout <span class=\"katex-eq\" data-katex-display=\"false\">r&lt;R<\/span>, la s\u00e9rie de fonctions <span class=\"katex-eq\" data-katex-display=\"false\">\\sum_{n \\in \\mathbb{N}} a_n x^n,<\/span> converge normalement sur l&rsquo;intervalle ferm\u00e9 <span class=\"katex-eq\" data-katex-display=\"false\">[-r, r]<\/span>.<\/p>\n\n\n\n<p><strong>Preuve du lemme d&rsquo;Abel:<\/strong><br>Soit <span class=\"katex-eq\" data-katex-display=\"false\">r&lt;R<\/span>.<br>Comme <span class=\"katex-eq\" data-katex-display=\"false\">(|a_n| \\cdot R^n)_{n}<\/span> est born\u00e9e, il existe <span class=\"katex-eq\" data-katex-display=\"false\">M&gt;0<\/span> tel que:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><span class=\"katex-eq\" data-katex-display=\"false\">\\forall n \\geq 0, \\quad |a_n| \\cdot R^n &lt; M.<\/span><\/p>\n\n\n\n<p>On a:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><span class=\"katex-eq\" data-katex-display=\"false\">\\forall n \\geq 0, \\quad \\mathrm{sup}_{x \\in [-r, r]} | a_n \\cdot x^n| =|a_n| r^n \\leq M \\cdot (r\/R)^n.<\/span><\/p>\n\n\n\n<p>On a <span class=\"katex-eq\" data-katex-display=\"false\">r\/R &lt; 1<\/span>, donc la s\u00e9rie g\u00e9om\u00e9trique <span class=\"katex-eq\" data-katex-display=\"false\">\\sum_n M \\cdot (r\/R)^n<\/span> converge.<br>Par <strong>th\u00e9or\u00e8me de domination sur les s\u00e9ries<\/strong>, la s\u00e9rie <span class=\"katex-eq\" data-katex-display=\"false\">\\sum_n \\mathrm{sup}_{x \\in [-r, r]} | a_n \\cdot x^n|<\/span> converge.<\/p>\n\n\n\n<p>Ce qui prouve que <span class=\"katex-eq\" data-katex-display=\"false\">\\sum_n a_n \\cdot x^n<\/span> converge normalement sur <span class=\"katex-eq\" data-katex-display=\"false\">[-r, r]<\/span>. <span class=\"katex-eq\" data-katex-display=\"false\">\\square<\/span><\/p>\n\n\n\n<p><strong>D\u00e9finition du rayon de convergence:<\/strong><br>Soit <span class=\"katex-eq\" data-katex-display=\"false\">\\sum_{n \\in \\mathbb{N}} a_n x^n,<\/span> une s\u00e9rie enti\u00e8re.<br>Son <strong>rayon de convergence<\/strong> est:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><span class=\"katex-eq\" data-katex-display=\"false\"> \\mathrm{sup} \\{ r \\in \\mathbb{R}_{\\geq 0} \\quad | \\quad (|a_n| r^n)_{n \\geq 0} \\text{ est born\u00e9e}  \\}<\/span><\/p>\n\n\n\n<p>On note de <span class=\"katex-eq\" data-katex-display=\"false\">R<\/span> le rayon de convergence.<br>Alors le lemme d&rsquo;Abel implique que:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>La s\u00e9rie converge simplement<\/strong> sur l&rsquo;intervalle ouvert <span class=\"katex-eq\" data-katex-display=\"false\">]-R, R[<\/span>.<\/li>\n\n\n\n<li>La convergence est <strong>normale sur tout intervalle compact<\/strong>.<\/li>\n\n\n\n<li>La fonction limite est <strong>continue<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p>D&rsquo;autre part on peut voir que pour tout <span class=\"katex-eq\" data-katex-display=\"false\">x<\/span> tel que <span class=\"katex-eq\" data-katex-display=\"false\">|x|&gt;R<\/span>, le terme g\u00e9n\u00e9ral de la s\u00e9rie num\u00e9rique <span class=\"katex-eq\" data-katex-display=\"false\">\\sum_n a_n \\cdot x^n<\/span> est <strong>non-born\u00e9e<\/strong>.<br>Donc en dehors du l&rsquo;intervalle ferm\u00e9 <span class=\"katex-eq\" data-katex-display=\"false\">[-R, R]<\/span> la s\u00e9rie enti\u00e8re <strong>diverge grossi\u00e8rement<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Exemples fondamentaux<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Exemple 1<\/h3>\n\n\n\n<p>Prenons la s\u00e9rie enti\u00e8re la plus simple: <span class=\"katex-eq\" data-katex-display=\"false\">\\sum_n x^n<\/span>.<\/p>\n\n\n\n<p>D&rsquo;apr\u00e8s la d\u00e9finition du rayon de convergence, on peut voir qu&rsquo;il vaut <span class=\"katex-eq\" data-katex-display=\"false\">R = 1<\/span>.<br>Ainsi, on peut en d\u00e9duire que la s\u00e9rie converge vers une fonction continue sur l&rsquo;intervalle ouvert <span class=\"katex-eq\" data-katex-display=\"false\">]-1,1[<\/span>.<\/p>\n\n\n\n<p>La formule de somme des suites g\u00e9om\u00e9triques, montre que la fonction limite est <span class=\"katex-eq\" data-katex-display=\"false\">x \\longmapsto \\frac{1}{1-x}<\/span>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Exemple 2<\/h2>\n\n\n\n<p>Prenons la s\u00e9rie enti\u00e8re: <span class=\"katex-eq\" data-katex-display=\"false\">\\sum_n  \\frac{x^n}{n!}<\/span>.<\/p>\n\n\n\n<p>On pose, pour tout <span class=\"katex-eq\" data-katex-display=\"false\">n \\geq 0<\/span>, <span class=\"katex-eq\" data-katex-display=\"false\">a_n = \\frac{1}{n!}<\/span>.<\/p>\n\n\n\n<p>Soit <span class=\"katex-eq\" data-katex-display=\"false\">R&gt;0<\/span>.<br>Par th\u00e9or\u00e8me de comparaison, la suite <span class=\"katex-eq\" data-katex-display=\"false\">(a_n \\cdot R^n)_{n \\geq 0}<\/span> tend vers 0, donc est born\u00e9e.<\/p>\n\n\n\n<p>Ainsi le rayon de convergence de <span class=\"katex-eq\" data-katex-display=\"false\">\\sum_n \\frac{x^n}{n!}<\/span> est <span class=\"katex-eq\" data-katex-display=\"false\">R = + \\infty<\/span>.<\/p>\n\n\n\n<p>Le s\u00e9rie converge donc vers une fonction continue sur <span class=\"katex-eq\" data-katex-display=\"false\">\\mathbb{R}<\/span>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ce qu&rsquo;il faut retenir<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Une <strong>s\u00e9rie enti\u00e8re<\/strong> est une s\u00e9rie de fonctions de la forme: <span class=\"katex-eq\" data-katex-display=\"false\">\\sum_n a_n \\cdot x^n<\/span>.<\/li>\n\n\n\n<li>Une s\u00e9rie enti\u00e8re admet un <strong>rayon de convergence<\/strong> <span class=\"katex-eq\" data-katex-display=\"false\">R<\/span>.<\/li>\n\n\n\n<li>La s\u00e9rie <strong>converge<\/strong> sur <span class=\"katex-eq\" data-katex-display=\"false\">]-R, R[<\/span> vers une <strong>fonction continue<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p>N&rsquo;h\u00e9site pas \u00e0 interagir et \u00e0 poser des questions en commentaire.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les s\u00e9ries enti\u00e8res constituent une cat\u00e9gorie essentielle dans l&rsquo;univers des s\u00e9ries de fonctions.Elles jouent un r\u00f4le crucial dans de nombreux domaines des math\u00e9matiques. Cet article vise \u00e0 pr\u00e9senter les concepts fondamentaux des s\u00e9ries enti\u00e8res, en s&rsquo;adressant particuli\u00e8rement \u00e0 ceux qui souhaitent apprendre avec un minimum de pr\u00e9requis. Dans cet article, [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":97,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[8,9,7],"tags":[],"class_list":["post-57","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analyse","category-lemme-dabel","category-serie-entiere"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Introduction aux S\u00e9ries enti\u00e8res - Maths-Sup<\/title>\n<meta name=\"description\" content=\"Plongez dans le monde des s\u00e9ries enti\u00e8res \ud83d\udcda\ud83d\udca1! Une intro simple et claire pour tous les passionn\u00e9s de maths \ud83e\uddee\ud83d\ude80. 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