{"id":24900,"date":"2021-03-16T01:47:00","date_gmt":"2021-03-16T01:47:00","guid":{"rendered":"http:\/\/toposuranos.com\/material\/?p=24900"},"modified":"2025-03-02T19:55:46","modified_gmt":"2025-03-02T19:55:46","slug":"ensembles-numeriques-des-naturels-aux-complexes","status":"publish","type":"post","link":"http:\/\/toposuranos.com\/material\/fr\/ensembles-numeriques-des-naturels-aux-complexes\/","title":{"rendered":"Ensembles Num\u00e9riques : Des Naturels aux Complexes"},"content":{"rendered":"<p><!DOCTYPE html> <html lang=\"fr\"> <head>     <meta charset=\"UTF-8\">     <meta name=\"description\" content=\"Exploration d\u00e9taill\u00e9e des ensembles num\u00e9riques, en commen\u00e7ant par les nombres naturels et en s'\u00e9tendant jusqu'aux nombres complexes.\">     <meta name=\"keywords\" content=\"Math\u00e9matiques, Nombres Naturels, Nombres Entiers, Nombres Rationnels, Nombres R\u00e9els, Nombres Complexes, Alg\u00e8bre, G\u00e9om\u00e9trie\">     <meta name=\"author\" content=\"Giorgio Reveco\">     <title>Une premi\u00e8re approche des Ensembles Num\u00e9riques &#8211; ToposUranos.com<\/title> <\/head> <body> <\/p>\n<div style=\"background-color:#F3F3F3; padding:20px;\">\n<center><\/p>\n<h1>Une Premi\u00e8re Approche des Ensembles Num\u00e9riques : Des Naturels aux Complexes<\/h1>\n<p><\/center><\/p>\n<p style=\"text-align:center;\"><em><strong>R\u00e9sum\u00e9 :<\/strong><\/br>Dans cette classe, nous explorerons comment les nombres naturels peuvent \u00eatre utilis\u00e9s comme base pour la construction d&#8217;autres ensembles num\u00e9riques pour surmonter certaines limitations op\u00e9rationnelles. Nous commencerons par les nombres entiers, qui nous permettent d&#8217;effectuer des soustractions de mani\u00e8re large. Ensuite, nous progresserons vers les nombres rationnels, qui nous fournissent l&#8217;outil de la division de mani\u00e8re compl\u00e8te. Plus tard, nous nous plongerons dans les nombres r\u00e9els pour pouvoir travailler avec les racines n-i\u00e8mes, et nous mentionnerons comment les nombres complexes sont introduits pour traiter des sc\u00e9narios sp\u00e9cifiques avec des racines n-i\u00e8mes. \u00c0 travers ces d\u00e9veloppements, on comprendra comment chaque nouvel ensemble num\u00e9rique \u00e9merge pour r\u00e9soudre les probl\u00e8mes inh\u00e9rents au pr\u00e9c\u00e9dent.<\/em><\/p>\n<p style=\"text-align:center;\"><strong><u>Objectifs d&#8217;Apprentissage<\/u>:<\/strong><br \/>\u00c0 la fin de cette classe, l&#8217;\u00e9tudiant sera capable de :<\/p>\n<ol>\n<li><strong>Identifier<\/strong> les propri\u00e9t\u00e9s de base des nombres naturels, entiers et rationnels.<\/li>\n<li><strong>Interpr\u00e9ter<\/strong> les propri\u00e9t\u00e9s et les op\u00e9rations de base qui sont h\u00e9rit\u00e9es ou modifi\u00e9es lors du passage d&#8217;un ensemble num\u00e9rique \u00e0 un autre.<\/li>\n<li><strong>Comparer<\/strong> les propri\u00e9t\u00e9s des diff\u00e9rents ensembles num\u00e9riques et comment ils sont interreli\u00e9s.<\/li>\n<\/ol>\n<p style=\"text-align:center;\"><strong><u>INDEX DES CONTENUS<\/u><\/strong><br \/>\n<a href=\"#1\">Introduction<\/a><br \/>\n<a href=\"#2\">Propri\u00e9t\u00e9s des Nombres Naturels<\/a><br \/>\n<a href=\"#3\">Transition des Nombres Naturels aux Entiers<\/a><br \/>\n<a href=\"#4\">Le Saut aux Nombres Rationnels<\/a><br \/>\n<a href=\"#5\">Nombres R\u00e9els et Irrationnels<\/a><br \/>\n<a href=\"#6\">Les Complexes : La Clause Alg\u00e9brique des Nombres R\u00e9els<\/a>\n<\/p>\n<p><center><iframe class=\"lazyload\" width=\"560\" height=\"315\" data-src=\"https:\/\/www.youtube.com\/embed\/PfK-pIlyCj4\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/center>\n<\/div>\n<p><a name=\"1\"><\/a><\/p>\n<h2>Introduction<\/h2>\n<div class=\"content\">\n<p style=\"text-align: justify; color: #000000;\"><a href=\"https:\/\/www.youtube.com\/watch?v=PfK-pIlyCj4&amp;t=96s\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #ff0000;\"><strong>Les nombres r\u00e9els, ainsi que d&#8217;autres ensembles num\u00e9riques que nous explorerons dans cette classe,<\/strong><\/span><\/a> sont introduits par l&#8217;expansion des nombres naturels. Il se trouve qu&#8217;avec deux nombres naturels quelconques, il n&#8217;est pas toujours possible d&#8217;effectuer des op\u00e9rations de soustraction ou de division, et ces expansions visent \u00e0 r\u00e9soudre ce probl\u00e8me.<\/p>\n<p style=\"text-align: justify; color: #000000;\">Pendant cette classe, nous r\u00e9viserons les <a href=\"https:\/\/toposuranos.com\/operaciones-con-numeros-naturales\/\" rel=\"noopener\" target=\"_blank\"><strong>op\u00e9rations et propri\u00e9t\u00e9s des nombres naturels,<\/strong><\/a> et sur cette base, nous progresserons vers la construction de tous les autres ensembles num\u00e9riques, jusqu&#8217;\u00e0 atteindre les nombres r\u00e9els et au-del\u00e0.<\/p>\n<p><a name=\"2\"><\/a><\/p>\n<h2>Propri\u00e9t\u00e9s des Nombres Naturels<\/h2>\n<p style=\"text-align: justify; color: #000000;\"><a href=\"https:\/\/www.youtube.com\/watch?v=PfK-pIlyCj4&amp;t=214s\" target=\"_blank\" rel=\"noopener\"><strong><span style=\"color: #ff0000;\">En abordant les op\u00e9rations avec des nombres naturels,<\/span><\/strong><\/a> nous faisons principalement r\u00e9f\u00e9rence \u00e0 l&#8217;addition et \u00e0 la multiplication, ainsi qu&#8217;\u00e0 leurs op\u00e9rations inverses respectives. Ci-dessous, ces propri\u00e9t\u00e9s sont r\u00e9sum\u00e9es :<\/p>\n<p style=\"text-align: justify; color: #000000;\">\u00c9tant donn\u00e9 que <span class=\"katex-eq\" data-katex-display=\"false\">a,b,c\\in\\mathbb{N},<\/span> il est v\u00e9rifi\u00e9 que :<\/p>\n<table>\n<tbody>\n<tr style=\"text-align: justify; color: #000000;\">\n<td>1.     <\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">a + b = b + a<\/span>\n<\/td>\n<\/tr>\n<tr style=\"text-align: left; color: #000000;\">\n<td>2.     <\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">a \\pm (b \\pm c) = (a\\pm b)\\pm c <\/span> (dans le cas de la soustraction, elle est valide \u00e0 condition qu&#8217;elle soit bien d\u00e9finie)\n<\/td>\n<\/tr>\n<tr style=\"text-align: left; color: #000000;\">\n<td>3.     <\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">a\\cdot b = b \\cdot a <\/span>\n<\/td>\n<\/tr>\n<tr style=\"text-align: left; color: #000000;\">\n<td>4.     <\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">a\\cdot(b\\cdot c)= (a\\cdot b)\\cdot c <\/span>\n<\/td>\n<\/tr>\n<tr style=\"text-align: left; color: #000000;\">\n<td>5.<span class=\"katex-eq\" data-katex-display=\"false\">\\;\\;\\;\\;\\;<\/span><\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">a\\cdot b = a \\leftrightarrow b=1 <\/span>\n<\/td>\n<\/tr>\n<tr style=\"text-align: left; color: #000000;\">\n<td>6.<\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">\\displaystyle \\frac{a}{b}\\in\\mathbb{N} \\leftrightarrow (\\exists k\\in\\mathbb{N})(a=b\\cdot k) <\/span>\n<\/td>\n<\/tr>\n<tr style=\"text-align: left; color: #000000;\">\n<td>7.<\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">a\\cdot(b+c)=a\\cdot b + a \\cdot c <\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><a name=\"3\"><\/a><\/p>\n<h2>Transition des Nombres Naturels aux Entiers<\/h2>\n<p style=\"text-align: justify; color: #000000;\"><a href=\"https:\/\/www.youtube.com\/watch?v=PfK-pIlyCj4&amp;t=418s\" target=\"_blank\" rel=\"noopener\"><strong><span style=\"color: #ff0000;\">Le premier aspect \u00e0 noter est que dans le cas des sommes :<\/span><\/strong><\/a> <span class=\"katex-eq\" data-katex-display=\"false\">(\\forall a,b\\in\\mathbb{N})(a+b\\in\\mathbb{N})<\/span>, tandis que pour les soustractions : <span class=\"katex-eq\" data-katex-display=\"false\">(\\forall a,b\\in\\mathbb{N})(a+b\\in\\mathbb{N} \\leftrightarrow a\\gt b)<\/span>. Un probl\u00e8me se pose lorsque la soustraction entre deux nombres naturels <span class=\"katex-eq\" data-katex-display=\"false\">a<\/span> et <span class=\"katex-eq\" data-katex-display=\"false\">b<\/span> n&#8217;a pas de sens si <span class=\"katex-eq\" data-katex-display=\"false\">a\\leq b<\/span> ; pour rem\u00e9dier \u00e0 cette situation, les nombres naturels sont \u00e9tendus \u00e0 l&#8217;ensemble des nombres entiers, o\u00f9 les soustractions de cette nature acqui\u00e8rent une valeur bien d\u00e9finie. Nous d\u00e9notons ce nouveau ensemble des <strong>nombres entiers<\/strong> par la lettre <span class=\"katex-eq\" data-katex-display=\"false\">\\mathbb{Z}<\/span>, et il se compose de tous les nombres naturels, de leurs inverses additifs et du z\u00e9ro.<\/p>\n<p style=\"text-align: center; color: #000000;\"><span class=\"katex-eq\" data-katex-display=\"false\">\\mathbb{Z} = \\{\\cdots, -3,-2,-1,0,1,2,3,\\cdots \\}<\/span>\n<p style=\"text-align: justify; color: #000000;\">Les nombres entiers h\u00e9ritent de toutes les propri\u00e9t\u00e9s et op\u00e9rations des nombres naturels, avec une extension sur la deuxi\u00e8me propri\u00e9t\u00e9, et les notions d&#8217;inverse et de neutre additif sont introduites.<\/p>\n<table>\n<tbody>\n<tr style=\"text-align: left; color: #000000;\">\n<td>2*.<\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">a \\pm (b \\pm c) = (a\\pm b) \\pm c <\/span><\/td>\n<\/tr>\n<tr style=\"text-align: left; color: #000000;\">\n<td>8.<\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">(\\forall a\\in\\mathbb{Z})(\\exists ! b\\in\\mathbb{Z})(a+b=0 \\leftrightarrow b=-a)<\/span><\/td>\n<\/tr>\n<tr style=\"text-align: left; color: #000000;\">\n<td>9.<\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">(\\forall a\\in\\mathbb{Z})(\\exists ! b\\in\\mathbb{Z})(a+b=a \\leftrightarrow b=0)<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"text-align: justify; color: #000000;\">L&#8217;\u00e9l\u00e9ment <span class=\"katex-eq\" data-katex-display=\"false\">b=-a<\/span> est ce que nous appelons <strong>l&#8217;inverse additif<\/strong> de <span class=\"katex-eq\" data-katex-display=\"false\">a<\/span>.<\/p>\n<p><a name=\"4\"><\/a><\/p>\n<h2>Le Saut aux Nombres Rationnels<\/h2>\n<p style=\"text-align: justify; color: #000000;\"><a href=\"https:\/\/www.youtube.com\/watch?v=PfK-pIlyCj4&amp;t=755s\" target=\"_blank\" rel=\"noopener\"><strong><span style=\"color: #ff0000;\">\u00c0 ce stade, la seule op\u00e9ration qui reste \u00e0 d\u00e9finir correctement est la division.<\/span><\/strong><\/a> Pour r\u00e9soudre cela, nous ferons une extension de l&#8217;ensemble des nombres entiers \u00e0 l&#8217;ensemble des nombres rationnels, qui sera donn\u00e9 par l&#8217;ensemble suivant :<\/p>\n<p style=\"text-align: center; color: #000000;\"><span class=\"katex-eq\" data-katex-display=\"false\">\\mathbb{Q}=\\left\\{a= \\displaystyle\\frac{n}{m}\\;|\\;n,m\\in\\mathbb{Z}\\wedge m\\neq 0 \\right\\}<\/span>\n<p style=\"text-align: justify; color: #000000;\">Cela acquiert une nouvelle propri\u00e9t\u00e9<\/p>\n<table>\n<tbody>\n<tr style=\"text-align: justify; color: #000000;\">\n<td>10.<\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">(\\forall a \\in \\mathbb{Q}\\setminus\\{0\\})(\\exists ! b \\in \\mathbb{Q})<\/span> <span class=\"katex-eq\" data-katex-display=\"false\">\\left[(a\\cdot b = 1) \\leftrightarrow \\left( b = \\displaystyle \\frac{1}{a} = a^{-1} \\right)\\right]<\/span><\/td>\n<\/tr>\n<tr style=\"text-align: justify; color: #000000;\">\n<td colspan=\"2\">Tout rationnel non nul a un inverse multiplicatif. L&#8217;inverse multiplicatif de <span class=\"katex-eq\" data-katex-display=\"false\">a<\/span> est <span class=\"katex-eq\" data-katex-display=\"false\">a^{-1}<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"text-align: justify; color: #000000;\">Avec ces nombres, op\u00e9rations et propri\u00e9t\u00e9s, de nouvelles op\u00e9rations avec leurs propri\u00e9t\u00e9s sont d\u00e9finies. Dans ceux-ci est d\u00e9finie la puissance n-i\u00e8me d&#8217;un rationnel <span class=\"katex-eq\" data-katex-display=\"false\">q<\/span> \u00e0 travers<\/p>\n<p style=\"text-align: center; color: #000000;\"><span class=\"katex-eq\" data-katex-display=\"false\">q^n = \\underbrace{q\\cdot q \\cdot \\cdots \\cdot q}_{n\\;fois};<\/span> avec <span class=\"katex-eq\" data-katex-display=\"false\">n\\in\\mathbb{N}<\/span>\n<p style=\"text-align: center; color: #000000;\"><span class=\"katex-eq\" data-katex-display=\"false\">q^{-n}= \\displaystyle \\frac{1}{q^n}<\/span>\n<p style=\"text-align: center; color: #000000;\">Remarquons que, \u00e0 partir de cela, et \u00e0 condition que <span class=\"katex-eq\" data-katex-display=\"false\">q\\neq 0<\/span>, nous pouvons dire que<\/p>\n<p style=\"text-align: center; color: #000000;\"><span class=\"katex-eq\" data-katex-display=\"false\">q^0 = 1<\/span>\n<p style=\"text-align: justify; color: #000000;\">De plus, chaque fois que des divisions par z\u00e9ro apparaissent, \u00e9tant donn\u00e9s deux rationnels quelconques <span class=\"katex-eq\" data-katex-display=\"false\">a,b<\/span> , et deux entiers <span class=\"katex-eq\" data-katex-display=\"false\">n,m<\/span> les propri\u00e9t\u00e9s suivantes seront remplies :<\/p>\n<table>\n<tbody>\n<tr style=\"text-align: justify; color: #000000;\">\n<td>11.<\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">a^n \\cdot a^m = a^{n+m} <\/span>\n<\/td>\n<\/tr>\n<tr style=\"text-align: justify; color: #000000;\">\n<td>12.<\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">(a^n)^m = a^{n\\cdot m} <\/span>\n<\/td>\n<\/tr>\n<tr style=\"text-align: justify; color: #000000;\">\n<td>13.<\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">(a\\cdot b)^n = a^{n} \\cdot a^{m} <\/span>\n<\/td>\n<\/tr>\n<tr style=\"text-align: justify; color: #000000;\">\n<td>14.<\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">\\left(\\displaystyle \\frac{a}{a}\\right)^n = \\frac{a^n}{a^n} <\/span>\n<\/td>\n<\/tr>\n<tr style=\"text-align: justify; color: #000000;\">\n<td>15.<\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">\\displaystyle \\frac{a^n}{a^m} = a^{n-m} = \\frac{1}{a^{m-n}} <\/span>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><a name=\"5\"><\/a><\/p>\n<h2>Nombres R\u00e9els et Irrationnels<\/h2>\n<p style=\"text-align: justify; color: #000000;\"><a href=\"https:\/\/www.youtube.com\/watch?v=PfK-pIlyCj4&amp;t=1031s\" target=\"_blank\" rel=\"noopener\"><strong><span style=\"color: #ff0000;\">Tout comme l&#8217;op\u00e9ration de soustraction (inverse de l&#8217;addition) et la division<\/span><\/strong><\/a> (inverse du produit) ont rendu n\u00e9cessaire l&#8217;expansion des naturels aux entiers et rationnels, respectivement, pour former des op\u00e9rations bien d\u00e9finies, il en va de m\u00eame pour les puissances. L&#8217;op\u00e9ration inverse de la <span class=\"katex-eq\" data-katex-display=\"false\">n<\/span>-i\u00e8me puissance est la racine <span class=\"katex-eq\" data-katex-display=\"false\">n<\/span>-i\u00e8me.<\/p>\n<h3>D\u00e9finition de Racine<\/h3>\n<p style=\"text-align: justify; color: #000000;\"><a href=\"https:\/\/www.youtube.com\/watch?v=PfK-pIlyCj4&amp;t=1071s\" target=\"_blank\" rel=\"noopener\"><strong><span style=\"color: #ff0000;\">Soit <span class=\"katex-eq\" data-katex-display=\"false\">n<\/span> un entier sup\u00e9rieur \u00e0 1<\/span><\/strong><\/a> et <span class=\"katex-eq\" data-katex-display=\"false\">p,q<\/span> des nombres rationnels quelconques, on d\u00e9finit la racine <span class=\"katex-eq\" data-katex-display=\"false\">n<\/span>-i\u00e8me de <span class=\"katex-eq\" data-katex-display=\"false\">q<\/span>, que nous repr\u00e9sentons \u00e0 travers les r\u00e8gles suivantes :<\/p>\n<table>\n<tbody>\n<tr style=\"text-align: justify; color: #000000;\">\n<td>16.<\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">q=0 \\rightarrow \\sqrt[n]{q} = 0<\/span><\/td>\n<\/tr>\n<tr style=\"text-align: justify; color: #000000;\">\n<td>17.<\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">q \\gt 0 \\rightarrow \\left[ \\sqrt[n]{q} = p \\leftrightarrow p^n = q \\right]<\/span><\/td>\n<\/tr>\n<tr style=\"text-align: justify; color: #000000;\">\n<td>18.<\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\"> \\left[ q \\lt 0 \\wedge n {\\;est\\;impair} \\right]\\rightarrow \\left[ \\sqrt[n]{q} = p \\leftrightarrow p^n = q \\right]<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"text-align: justify; color: #000000;\">En r\u00e9sum\u00e9, la <span class=\"katex-eq\" data-katex-display=\"false\">n<\/span>-i\u00e8me racine de <span class=\"katex-eq\" data-katex-display=\"false\">q<\/span> est un nombre <span class=\"katex-eq\" data-katex-display=\"false\">p<\/span> tel que, lorsqu&#8217;il est \u00e9lev\u00e9 \u00e0 la puissance <span class=\"katex-eq\" data-katex-display=\"false\">n<\/span>, il vous redonne le nombre <span class=\"katex-eq\" data-katex-display=\"false\">q<\/span>. Dans ces cas, lorsque <span class=\"katex-eq\" data-katex-display=\"false\">n=2<\/span>, au lieu d&#8217;\u00e9crire <span class=\"katex-eq\" data-katex-display=\"false\">\\sqrt[2]{q}<\/span>, nous \u00e9crivons simplement <span class=\"katex-eq\" data-katex-display=\"false\">\\sqrt{q}.<\/span>\n<h3>L&#8217;Apparition des Nombres Irrationnels<\/h3>\n<p style=\"text-align: justify; color: #000000;\"><a href=\"https:\/\/www.youtube.com\/watch?v=PfK-pIlyCj4&amp;t=1216s\" target=\"_blank\" rel=\"noopener\"><strong><span style=\"color: #ff0000;\">Arriv\u00e9s \u00e0 ce point, nous nous demandons<\/span><\/strong><\/a> la racine n-i\u00e8me sera-t-elle bien d\u00e9finie pour tous les \u00e9l\u00e9ments de <span class=\"katex-eq\" data-katex-display=\"false\">\\mathbb{Q}<\/span> ? La v\u00e9rit\u00e9, c&#8217;est que bien que ce ne soit pas si \u00e9vident (compar\u00e9 \u00e0 ce qui a \u00e9t\u00e9 vu avec la soustraction et la division), il existe des rationnels qui n&#8217;ont pas de racine n-i\u00e8me rationnelle. Pour voir cela, il suffit de revoir l&#8217;exemple suivant :<\/p>\n<p style=\"text-align: center; color: #000000;\"><em><strong><span class=\"katex-eq\" data-katex-display=\"false\">\\sqrt{2}<\/span> n&#8217;est pas un nombre rationnel.<\/strong><\/em><\/p>\n<p style=\"text-align: justify; color: #000080;\"><strong>D\u00c9MONSTRATION<\/strong><\/p>\n<p style=\"text-align: justify; color: #000000;\">Nous prouverons ceci par r\u00e9duction \u00e0 l&#8217;absurde.<\/p>\n<p style=\"text-align: justify; color: #000000;\">Supposons que <span class=\"katex-eq\" data-katex-display=\"false\">\\sqrt{2}<\/span> est un nombre rationnel, c&#8217;est-\u00e0-dire qu&#8217;il existe des <span class=\"katex-eq\" data-katex-display=\"false\">p,q\\in\\mathbb{Z}<\/span>, avec <span class=\"katex-eq\" data-katex-display=\"false\">q\\neq 0,<\/span> tels que <span class=\"katex-eq\" data-katex-display=\"false\">\\sqrt{2}=p\/q,<\/span> et que de plus il a \u00e9t\u00e9 simplifi\u00e9 jusqu&#8217;\u00e0 \u00eatre irr\u00e9ductible. Si nous le faisons alors nous pouvons dire que<\/p>\n<p style=\"text-align: center; color: #000000;\"><span class=\"katex-eq\" data-katex-display=\"false\">2 = \\left(\\sqrt{2} \\right)^2 =\\displaystyle \\frac{p^2}{q^2} = <\/span> <span style=\"color: #800000;\"><span class=\"katex-eq\" data-katex-display=\"false\">\\left(\\displaystyle \\frac{p}{q}\\right)^2<\/span>\n<\/span><\/p>\n<p style=\"text-align: justify; color: #000000;\">Mais ceci entre en contradiction avec le fait que <span class=\"katex-eq\" data-katex-display=\"false\">p\/q<\/span> \u00e9tait \u00e9crit sous forme irr\u00e9ductible (maintenant il s&#8217;av\u00e8re que l&#8217;on peut simplifier <span class=\"katex-eq\" data-katex-display=\"false\">(p\/q)^2<\/span> et son r\u00e9sultat est 2). Comme supposer que <span class=\"katex-eq\" data-katex-display=\"false\">\\sqrt{2}<\/span> est rationnel produit une contradiction, alors celui-ci ne peut pas \u00eatre un nombre rationnel et nous disons, en cons\u00e9quence, qu&#8217;il est irrationnel.<\/p>\n<h3>L&#8217;Expansion aux Nombres R\u00e9els<\/h3>\n<p style=\"text-align: justify; color: #000000;\"><a href=\"https:\/\/www.youtube.com\/watch?v=PfK-pIlyCj4&amp;t=1514s\" target=\"_blank\" rel=\"noopener\"><strong><span style=\"color: #ff0000;\">Ces r\u00e9sultats mettent en \u00e9vidence le fait que,<\/span> <\/strong><\/a>pour d\u00e9finir correctement la n-i\u00e8me racine, il est n\u00e9cessaire d&#8217;\u00e9largir les rationnels \u00e0 un nouvel ensemble, c&#8217;est l&#8217;ensemble des nombres r\u00e9els, que nous d\u00e9notons par <span class=\"katex-eq\" data-katex-display=\"false\">\\mathbb{R}<\/span> et qui contient \u00e0 la fois les rationnels et les irrationnels<\/p>\n<p style=\"text-align: center; color: #000000;\"><span class=\"katex-eq\" data-katex-display=\"false\">\\mathbb{R}= \\mathbb{Q}\\cup \\mathbb{Q}^*<\/span>\n<p><a name=\"6\"><\/a><\/p>\n<h2>Les Complexes : La Clause Alg\u00e9brique des Nombres R\u00e9els<\/h2>\n<p style=\"text-align: justify; color: #000000;\"><a href=\"https:\/\/www.youtube.com\/watch?v=PfK-pIlyCj4&amp;t=1532s\" target=\"_blank\" rel=\"noopener\"><strong><span style=\"color: #ff0000;\">\u00c0 ce stade, nous devons noter deux choses :<\/span><\/strong><\/a> (1) quand <span class=\"katex-eq\" data-katex-display=\"false\">n<\/span> est pair, la racine n-i\u00e8me devient multivari\u00e9e et, (2) si en plus nous essayons de calculer <span class=\"katex-eq\" data-katex-display=\"false\">\\sqrt[n]{q}<\/span> avec <span class=\"katex-eq\" data-katex-display=\"false\">q\\lt 0,<\/span> nous verrons que ce nombre ne peut pas \u00eatre un nombre r\u00e9el.<\/p>\n<p style=\"text-align: justify; color: #000000;\">Le premier est r\u00e9solu en d\u00e9finissant la <strong>racine principale<\/strong> en appliquant un l\u00e9ger changement sur le point (17) qui parle de la d\u00e9finition de la racine, en restant de la mani\u00e8re suivante :<\/p>\n<table>\n<tbody>\n<tr style=\"text-align: justify; color: #000000;\">\n<td>17*.<\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">q\\gt 0 \\rightarrow \\left[ 0\\lt p=\\sqrt[n]{q} \\leftrightarrow p^n=q \\right]<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"text-align: justify; color: #000000;\">Le second est atteint en \u00e9largissant l&#8217;ensemble des r\u00e9els \u00e0 l&#8217;ensemble des nombres complexes <span class=\"katex-eq\" data-katex-display=\"false\">\\mathbb{C},<\/span> mais cette construction sera pour plus tard.<\/p>\n<p><\/html><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Une premi\u00e8re approche des Ensembles Num\u00e9riques &#8211; ToposUranos.com Une Premi\u00e8re Approche des Ensembles Num\u00e9riques : Des Naturels aux Complexes R\u00e9sum\u00e9 :Dans cette classe, nous explorerons comment les nombres naturels peuvent \u00eatre utilis\u00e9s comme base pour la construction d&#8217;autres ensembles num\u00e9riques pour surmonter certaines limitations op\u00e9rationnelles. Nous commencerons par les nombres entiers, qui nous permettent d&#8217;effectuer [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":25042,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":19,"footnotes":""},"categories":[585,1043,569],"tags":[],"class_list":["post-24900","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-algebre-et-geometrie","category-algebre-generale","category-mathematiques"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ensembles Num\u00e9riques : Des Naturels aux Complexes - toposuranos.com\/material<\/title>\n<meta name=\"description\" content=\"Obtenez une premi\u00e8re vision de comment les ensembles num\u00e9riques sont construits, des nombres naturels aux complexes.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/toposuranos.com\/material\/fr\/ensembles-numeriques-des-naturels-aux-complexes\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ensembles Num\u00e9riques : Des Naturels aux Complexes\" \/>\n<meta property=\"og:description\" content=\"Obtenez une premi\u00e8re vision de comment les ensembles num\u00e9riques sont construits, des nombres naturels aux complexes.\" \/>\n<meta property=\"og:url\" content=\"http:\/\/toposuranos.com\/material\/fr\/ensembles-numeriques-des-naturels-aux-complexes\/\" \/>\n<meta property=\"og:site_name\" content=\"toposuranos.com\/material\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/groups\/toposuranos\" \/>\n<meta property=\"article:published_time\" content=\"2021-03-16T01:47:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-03-02T19:55:46+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/toposuranos.com\/material\/wp-content\/uploads\/2021\/03\/naturales-captura-1024x585.jpg\" \/>\n<meta name=\"author\" content=\"giorgio.reveco\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Ensembles Num\u00e9riques : Des Naturels aux Complexes\" \/>\n<meta name=\"twitter:description\" content=\"Obtenez une premi\u00e8re vision de comment les ensembles num\u00e9riques sont construits, des nombres naturels aux complexes.\" \/>\n<meta name=\"twitter:image\" content=\"http:\/\/toposuranos.com\/material\/wp-content\/uploads\/2021\/03\/naturales-captura.jpg\" \/>\n<meta name=\"twitter:creator\" content=\"@topuranos\" \/>\n<meta name=\"twitter:site\" content=\"@topuranos\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"giorgio.reveco\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tiempo de lectura\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"http:\\\/\\\/toposuranos.com\\\/material\\\/fr\\\/ensembles-numeriques-des-naturels-aux-complexes\\\/#article\",\"isPartOf\":{\"@id\":\"http:\\\/\\\/toposuranos.com\\\/material\\\/fr\\\/ensembles-numeriques-des-naturels-aux-complexes\\\/\"},\"author\":{\"name\":\"giorgio.reveco\",\"@id\":\"http:\\\/\\\/toposuranos.com\\\/material\\\/#\\\/schema\\\/person\\\/e15164361c3f9a2a02cf6c234cf7fdc1\"},\"headline\":\"Ensembles Num\u00e9riques : Des Naturels aux Complexes\",\"datePublished\":\"2021-03-16T01:47:00+00:00\",\"dateModified\":\"2025-03-02T19:55:46+00:00\",\"mainEntityOfPage\":{\"@id\":\"http:\\\/\\\/toposuranos.com\\\/material\\\/fr\\\/ensembles-numeriques-des-naturels-aux-complexes\\\/\"},\"wordCount\":1743,\"commentCount\":0,\"publisher\":{\"@id\":\"http:\\\/\\\/toposuranos.com\\\/material\\\/#organization\"},\"image\":{\"@id\":\"http:\\\/\\\/toposuranos.com\\\/material\\\/fr\\\/ensembles-numeriques-des-naturels-aux-complexes\\\/#primaryimage\"},\"thumbnailUrl\":\"http:\\\/\\\/toposuranos.com\\\/material\\\/wp-content\\\/uploads\\\/2021\\\/03\\\/conjuntosnumericos-7.jpg\",\"articleSection\":[\"Alg\u00e8bre et G\u00e9om\u00e9trie\",\"Alg\u00e8bre G\u00e9n\u00e9rale\",\"Math\u00e9matiques\"],\"inLanguage\":\"es\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"http:\\\/\\\/toposuranos.com\\\/material\\\/fr\\\/ensembles-numeriques-des-naturels-aux-complexes\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"http:\\\/\\\/toposuranos.com\\\/material\\\/fr\\\/ensembles-numeriques-des-naturels-aux-complexes\\\/\",\"url\":\"http:\\\/\\\/toposuranos.com\\\/material\\\/fr\\\/ensembles-numeriques-des-naturels-aux-complexes\\\/\",\"name\":\"Ensembles Num\u00e9riques : Des Naturels aux Complexes - 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