{"id":24895,"date":"2021-03-16T00:00:15","date_gmt":"2021-03-16T00:00:15","guid":{"rendered":"http:\/\/toposuranos.com\/material\/?p=24895"},"modified":"2025-03-02T19:53:53","modified_gmt":"2025-03-02T19:53:53","slug":"conjuntos-numericos-dos-naturais-aos-complexos","status":"publish","type":"post","link":"https:\/\/toposuranos.com\/material\/pt\/conjuntos-numericos-dos-naturais-aos-complexos\/","title":{"rendered":"Conjuntos Num\u00e9ricos: Dos Naturais aos Complexos"},"content":{"rendered":"<p><!DOCTYPE html> <html lang=\"pt\"> <head>     <meta charset=\"UTF-8\">     <meta name=\"description\" content=\"Explora\u00e7\u00e3o detalhada dos conjuntos num\u00e9ricos, come\u00e7ando pelos n\u00fameros naturais e estendendo-se at\u00e9 os n\u00fameros complexos.\">     <meta name=\"keywords\" content=\"Matem\u00e1tica, N\u00fameros Naturais, N\u00fameros Inteiros, N\u00fameros Racionais, N\u00fameros Reais, N\u00fameros Complexos, \u00c1lgebra, Geometria\">     <meta name=\"author\" content=\"Giorgio Reveco\">     <title>Uma primeira aproxima\u00e7\u00e3o aos Conjuntos Num\u00e9ricos &#8211; ToposUranos.com<\/title> <\/head> <body> <\/p>\n<div style=\"background-color:#F3F3F3; padding:20px;\">\n<center><\/p>\n<h1>Uma Primeira Aproxima\u00e7\u00e3o aos Conjuntos Num\u00e9ricos: Dos Naturais aos Complexos<\/h1>\n<p><\/center><\/p>\n<p style=\"text-align:center;\"><em><strong>Resumo:<\/strong><\/br>Nesta aula, exploraremos como os n\u00fameros naturais podem ser usados como base para a constru\u00e7\u00e3o de outros conjuntos num\u00e9ricos para superar certas limita\u00e7\u00f5es operacionais. Come\u00e7aremos com os n\u00fameros inteiros, que nos permitem realizar subtra\u00e7\u00f5es de maneira ampla. Depois, avan\u00e7aremos para os n\u00fameros racionais, que nos fornecem a ferramenta de divis\u00e3o de maneira completa. Posteriormente, nos aprofundaremos nos n\u00fameros reais para poder trabalhar com ra\u00edzes en\u00e9simas, e mencionaremos como os n\u00fameros complexos s\u00e3o introduzidos para abordar cen\u00e1rios espec\u00edficos com ra\u00edzes en\u00e9simas. Atrav\u00e9s destes desenvolvimentos, compreender\u00e1 como cada novo conjunto num\u00e9rico surge para resolver problemas inerentes ao anterior.<\/em><\/p>\n<p style=\"text-align:center;\"><strong><u>Objetivos de Aprendizagem<\/u>:<\/strong><br \/>Ao concluir esta aula, o estudante ser\u00e1 capaz de:<\/p>\n<ol>\n<li><strong>Identificar<\/strong> as propriedades b\u00e1sicas dos n\u00fameros naturais, inteiros e racionais.<\/li>\n<li><strong>Interpretar<\/strong> as propriedades e opera\u00e7\u00f5es b\u00e1sicas que s\u00e3o herdadas ou modificadas ao transitar de um conjunto num\u00e9rico para outro.<\/li>\n<li><strong>Comparar<\/strong> as propriedades dos diferentes conjuntos num\u00e9ricos e como se relacionam entre si.<\/li>\n<\/ol>\n<p style=\"text-align:center;\"><strong><u>\u00cdNDICE DE CONTE\u00daDOS<\/u><\/strong><br \/>\n<a href=\"#1\">Introdu\u00e7\u00e3o<\/a><br \/>\n<a href=\"#2\">Propriedades dos N\u00fameros Naturais<\/a><br \/>\n<a href=\"#3\">Transi\u00e7\u00e3o dos N\u00fameros Naturais para os Inteiros<\/a><br \/>\n<a href=\"#4\">O Salto para os N\u00fameros Racionais<\/a><br \/>\n<a href=\"#5\">N\u00fameros Reais e Irracionais<\/a><br \/>\n<a href=\"#6\">Os Complexos: A Cl\u00e1usula Alg\u00e9brica dos N\u00fameros Reais<\/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>Introdu\u00e7\u00e3o<\/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>Os n\u00fameros reais, juntamente com outros conjuntos num\u00e9ricos que exploraremos nesta aula,<\/strong><\/span><\/a> s\u00e3o introduzidos atrav\u00e9s da expans\u00e3o dos n\u00fameros naturais. Acontece que, com quaisquer dois n\u00fameros naturais, nem sempre \u00e9 poss\u00edvel realizar opera\u00e7\u00f5es de subtra\u00e7\u00e3o ou divis\u00e3o, e estas expans\u00f5es visam resolver este inconveniente.<\/p>\n<p style=\"text-align: justify; color: #000000;\">Durante esta aula, revisaremos as <a href=\"https:\/\/toposuranos.com\/operacoes-com-numeros-naturais\/\" rel=\"noopener\" target=\"_blank\"><strong>opera\u00e7\u00f5es e propriedades dos n\u00fameros naturais,<\/strong><\/a> e com base nisso, avan\u00e7aremos para a constru\u00e7\u00e3o de todos os outros conjuntos num\u00e9ricos, at\u00e9 atingir os n\u00fameros reais e al\u00e9m.<\/p>\n<p><a name=\"2\"><\/a><\/p>\n<h2>Propriedades dos N\u00fameros Naturais<\/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;\">Ao abordar as opera\u00e7\u00f5es com n\u00fameros naturais,<\/span><\/strong><\/a> referimo-nos principalmente \u00e0 soma e ao produto, juntamente com suas respectivas opera\u00e7\u00f5es inversas. A seguir, resumem-se estas propriedades:<\/p>\n<p style=\"text-align: justify; color: #000000;\">Dado que <span class=\"katex-eq\" data-katex-display=\"false\">a,b,c\\in\\mathbb{N},<\/span> verifica-se 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> (no caso da subtra\u00e7\u00e3o, \u00e9 v\u00e1lida sempre que estiver bem definida)<\/p>\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>Transi\u00e7\u00e3o dos N\u00fameros Naturais para os Inteiros<\/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;\">O primeiro aspecto a notar \u00e9 que no caso das somas:<\/span><\/strong><\/a> <span class=\"katex-eq\" data-katex-display=\"false\">(\\forall a,b\\in\\mathbb{N})(a+b\\in\\mathbb{N})<\/span>, enquanto que para as subtra\u00e7\u00f5es: <span class=\"katex-eq\" data-katex-display=\"false\">(\\forall a,b\\in\\mathbb{N})(a+b\\in\\mathbb{N} \\leftrightarrow a\\gt b)<\/span>. Um inconveniente surge quando a subtra\u00e7\u00e3o entre dois n\u00fameros naturais <span class=\"katex-eq\" data-katex-display=\"false\">a<\/span> e <span class=\"katex-eq\" data-katex-display=\"false\">b<\/span> n\u00e3o faz sentido se <span class=\"katex-eq\" data-katex-display=\"false\">a\\leq b<\/span>; para remediar esta situa\u00e7\u00e3o, expandem-se os n\u00fameros naturais ao conjunto dos n\u00fameros inteiros, onde as subtra\u00e7\u00f5es desta natureza adquirem um valor bem definido. Denotamos este novo conjunto dos <strong>n\u00fameros inteiros<\/strong> com a letra <span class=\"katex-eq\" data-katex-display=\"false\">\\mathbb{Z}<\/span>, e comp\u00f5e-se de todos os n\u00fameros naturais, seus inversos aditivos e o zero.<\/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;\">Os n\u00fameros inteiros herdam todas as propriedades e opera\u00e7\u00f5es dos n\u00fameros naturais, com uma extens\u00e3o sobre a segunda propriedade, e introduzem-se as no\u00e7\u00f5es de inverso e neutro aditivo.<\/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;\">O elemento <span class=\"katex-eq\" data-katex-display=\"false\">b=-a<\/span> \u00e9 o que denominamos <strong>inverso aditivo<\/strong> de <span class=\"katex-eq\" data-katex-display=\"false\">a<\/span>.<\/p>\n<p><a name=\"4\"><\/a><\/p>\n<h2>O Salto para os N\u00fameros Racionais<\/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;\">Neste ponto, a \u00fanica opera\u00e7\u00e3o que nos resta sem definir corretamente \u00e9 a divis\u00e3o.<\/span><\/strong><\/a> Para resolver isso realizaremos uma expans\u00e3o sobre o conjunto dos n\u00fameros inteiros ao conjunto dos n\u00fameros racionais, que ser\u00e1 dado pelo seguinte conjunto:<\/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;\">Com isso adquire-se uma nova propriedade<\/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\">Todo racional n\u00e3o nulo tem um inverso multiplicativo. O inverso multiplicativo de <span class=\"katex-eq\" data-katex-display=\"false\">a<\/span> \u00e9 <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;\">Com estes n\u00fameros, opera\u00e7\u00f5es e propriedades definem-se novas opera\u00e7\u00f5es com suas propriedades. Nestes define-se a pot\u00eancia n-\u00e9sima de um racional <span class=\"katex-eq\" data-katex-display=\"false\">q<\/span> atrav\u00e9s de<\/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\\;vezes};<\/span> com <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;\">Notemos que, a partir disso, e sempre que <span class=\"katex-eq\" data-katex-display=\"false\">q\\neq 0<\/span>, podemos dizer 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;\">Al\u00e9m disso, sempre que aparecerem divis\u00f5es por zero, dados dois racionais quaisquer <span class=\"katex-eq\" data-katex-display=\"false\">a,b<\/span> , e dois inteiros <span class=\"katex-eq\" data-katex-display=\"false\">n,m<\/span> cumprir-se-\u00e3o as seguintes propriedades:<\/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>N\u00fameros Reais e Irracionais<\/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;\">Assim como a opera\u00e7\u00e3o da subtra\u00e7\u00e3o (inversa da soma) e a divis\u00e3o<\/span><\/strong><\/a> (inversa do produto) fizeram necess\u00e1rio expandir os naturais aos inteiros e racionais, respectivamente, para formar opera\u00e7\u00f5es bem definidas, de forma an\u00e1loga ocorre com as pot\u00eancias. A opera\u00e7\u00e3o inversa da <span class=\"katex-eq\" data-katex-display=\"false\">n<\/span>-\u00e9sima pot\u00eancia \u00e9 a raiz <span class=\"katex-eq\" data-katex-display=\"false\">n<\/span>-\u00e9sima.<\/p>\n<h3>Defini\u00e7\u00e3o de Raiz<\/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;\">Seja <span class=\"katex-eq\" data-katex-display=\"false\">n<\/span> um inteiro maior que 1<\/span><\/strong><\/a> e <span class=\"katex-eq\" data-katex-display=\"false\">p,q<\/span> n\u00fameros racionais quaisquer, define-se a raiz <span class=\"katex-eq\" data-katex-display=\"false\">n<\/span>-\u00e9sima de <span class=\"katex-eq\" data-katex-display=\"false\">q<\/span>, que representamos atrav\u00e9s das seguintes regras:<\/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 {\\;\u00e9\\;\u00edmpar} \\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;\">Em resumo, a <span class=\"katex-eq\" data-katex-display=\"false\">n<\/span>-\u00e9sima raiz de <span class=\"katex-eq\" data-katex-display=\"false\">q<\/span> \u00e9 um n\u00famero <span class=\"katex-eq\" data-katex-display=\"false\">p<\/span> tal que, ao ser elevado a <span class=\"katex-eq\" data-katex-display=\"false\">n<\/span>, te devolve o n\u00famero <span class=\"katex-eq\" data-katex-display=\"false\">q<\/span>. Nestes casos, quando <span class=\"katex-eq\" data-katex-display=\"false\">n=2<\/span>, em vez de escrever <span class=\"katex-eq\" data-katex-display=\"false\">\\sqrt[2]{q}<\/span>, por simplicidade escrevemos <span class=\"katex-eq\" data-katex-display=\"false\">\\sqrt{q}.<\/span>\n<h3>A Apari\u00e7\u00e3o dos N\u00fameros Irracionais<\/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;\">Chegados a este ponto \u00e9 quando nos perguntamos<\/span><\/strong><\/a> Estar\u00e1 bem definida a raiz n-\u00e9sima para todos os elementos de <span class=\"katex-eq\" data-katex-display=\"false\">\\mathbb{Q}<\/span>? A verdade, \u00e9 que apesar de n\u00e3o ser t\u00e3o evidente (em compara\u00e7\u00e3o ao visto com a subtra\u00e7\u00e3o e a divis\u00e3o), existem racionais que n\u00e3o t\u00eam raiz n-\u00e9sima racional. Para ver isso basta com revisar o seguinte exemplo:<\/p>\n<p style=\"text-align: center; color: #000000;\"><em><strong><span class=\"katex-eq\" data-katex-display=\"false\">\\sqrt{2}<\/span> n\u00e3o \u00e9 um n\u00famero racional.<\/strong><\/em><\/p>\n<p style=\"text-align: justify; color: #000080;\"><strong>DEMONSTRA\u00c7\u00c3O<\/strong><\/p>\n<p style=\"text-align: justify; color: #000000;\">Provaremos isso por redu\u00e7\u00e3o ao absurdo.<\/p>\n<p style=\"text-align: justify; color: #000000;\">Suponhamos que <span class=\"katex-eq\" data-katex-display=\"false\">\\sqrt{2}<\/span> seja um n\u00famero racional, isto \u00e9, que existem <span class=\"katex-eq\" data-katex-display=\"false\">p,q\\in\\mathbb{Z}<\/span>, com <span class=\"katex-eq\" data-katex-display=\"false\">q\\neq 0,<\/span> tais que <span class=\"katex-eq\" data-katex-display=\"false\">\\sqrt{2}=p\/q,<\/span> e que al\u00e9m disso foi simplificado at\u00e9 ficar irredut\u00edvel. Se o fazemos ent\u00e3o podemos dizer 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;\">Mas isso entra em contradi\u00e7\u00e3o com o fato de que <span class=\"katex-eq\" data-katex-display=\"false\">p\/q<\/span> estava escrito em forma irredut\u00edvel (agora resulta que se pode simplificar <span class=\"katex-eq\" data-katex-display=\"false\">(p\/q)^2<\/span> e seu resultado \u00e9 2). Como o supor que <span class=\"katex-eq\" data-katex-display=\"false\">\\sqrt{2}<\/span> \u00e9 racional produz uma contradi\u00e7\u00e3o, ent\u00e3o este n\u00e3o pode ser um n\u00famero racional e dizemos, em consequ\u00eancia, que \u00e9 irracional.<\/p>\n<h3>A Expans\u00e3o para os N\u00fameros Reais<\/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;\">Esses resultados evidenciam o fato de que,<\/span> <\/strong><\/a>para definir corretamente a raiz n-\u00e9sima, \u00e9 necess\u00e1rio ampliar os racionais para um novo conjunto, este \u00e9 o conjunto dos n\u00fameros reais, que denotamos por <span class=\"katex-eq\" data-katex-display=\"false\">\\mathbb{R}<\/span> e que cont\u00e9m tanto os racionais quanto os irracionais.<\/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>Os Complexos: A Cl\u00e1usula Alg\u00e9brica dos N\u00fameros Reais<\/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;\">Neste ponto, devemos notar duas coisas:<\/span><\/strong><\/a> (1) quando <span class=\"katex-eq\" data-katex-display=\"false\">n<\/span> \u00e9 par, a raiz n-\u00e9sima fica multivalorada e, (2) se tamb\u00e9m tentarmos calcular <span class=\"katex-eq\" data-katex-display=\"false\">\\sqrt[n]{q}<\/span> com <span class=\"katex-eq\" data-katex-display=\"false\">q\\lt 0,<\/span> veremos que tal n\u00famero n\u00e3o pode ser um n\u00famero real.<\/p>\n<p style=\"text-align: justify; color: #000000;\">O primeiro \u00e9 resolvido definindo a <strong>raiz principal<\/strong>, aplicando uma pequena altera\u00e7\u00e3o no ponto (17) que fala sobre a defini\u00e7\u00e3o da raiz, ficando da seguinte maneira:<\/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;\">O segundo \u00e9 conseguido expandindo o conjunto dos reais para o conjunto dos n\u00fameros complexos <span class=\"katex-eq\" data-katex-display=\"false\">\\mathbb{C},<\/span> mas essa constru\u00e7\u00e3o ser\u00e1 para mais tarde.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Uma primeira aproxima\u00e7\u00e3o aos Conjuntos Num\u00e9ricos &#8211; ToposUranos.com Uma Primeira Aproxima\u00e7\u00e3o aos Conjuntos Num\u00e9ricos: Dos Naturais aos Complexos Resumo:Nesta aula, exploraremos como os n\u00fameros naturais podem ser usados como base para a constru\u00e7\u00e3o de outros conjuntos num\u00e9ricos para superar certas limita\u00e7\u00f5es operacionais. Come\u00e7aremos com os n\u00fameros inteiros, que nos permitem realizar subtra\u00e7\u00f5es de maneira ampla. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":25032,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":8,"footnotes":""},"categories":[587,1033,571],"tags":[],"class_list":["post-24895","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-algebra-e-geometria","category-algebra-geral","category-matematica-pt"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Conjuntos Num\u00e9ricos: Dos Naturais aos Complexos - toposuranos.com\/material<\/title>\n<meta name=\"description\" content=\"Obtenha uma primeira vis\u00e3o de como s\u00e3o constru\u00eddos os conjuntos num\u00e9ricos, desde os n\u00fameros naturais at\u00e9 os complexos.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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