{"id":365,"date":"2023-07-04T12:33:10","date_gmt":"2023-07-04T12:33:10","guid":{"rendered":"https:\/\/mathority.org\/pt\/funcoes-limitadas\/"},"modified":"2023-07-04T12:33:10","modified_gmt":"2023-07-04T12:33:10","slug":"funcoes-limitadas","status":"publish","type":"post","link":"https:\/\/mathority.org\/pt\/funcoes-limitadas\/","title":{"rendered":"Fun\u00e7\u00f5es limitadas"},"content":{"rendered":"<p>Neste artigo explicamos o que s\u00e3o fun\u00e7\u00f5es limitadas (superiores e inferiores). Al\u00e9m disso, mostraremos o que significa uma fun\u00e7\u00e3o ser limitada em um ponto e, por fim, voc\u00ea encontrar\u00e1 as propriedades desse tipo de fun\u00e7\u00e3o.<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%c2%bfque-es-una-funcion-acotada\"><\/span> O que \u00e9 uma fun\u00e7\u00e3o limitada?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Uma <strong>fun\u00e7\u00e3o limitada<\/strong> \u00e9 uma fun\u00e7\u00e3o cujo gr\u00e1fico est\u00e1 dentro dos limites. Ou seja, uma fun\u00e7\u00e3o \u00e9 limitada acima se existe um n\u00famero K tal que n\u00e3o h\u00e1 valor da fun\u00e7\u00e3o maior que K (f(x)\u2264K), e uma fun\u00e7\u00e3o \u00e9 limitada abaixo se existe um n\u00famero K tal que \u00e9 menor que todos os valores da fun\u00e7\u00e3o (f(x)\u2265K). Portanto, uma fun\u00e7\u00e3o limitada \u00e9 uma fun\u00e7\u00e3o limitada acima e abaixo. <\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/uploads\/2023\/07\/fonction-bornee.webp\" alt=\"fun\u00e7\u00e3o limitada\" class=\"wp-image-427\" width=\"481\" height=\"231\" srcset=\"\" sizes=\"auto, \"><\/figure>\n<\/div>\n<p> Por exemplo, a fun\u00e7\u00e3o seno trigonom\u00e9trica, representada graficamente acima, \u00e9 limitada na parte superior por f(x)=1 e \u00e9 limitada na parte inferior por f(x)=-1 (linhas pontilhadas vermelhas), uma vez que todos os valores do fun\u00e7\u00e3o est\u00e3o dentro desses dois limites. Voc\u00ea pode ver mais propriedades desta fun\u00e7\u00e3o no seguinte link:<\/p>\n<p> <span style=\"color:#ff951b\">\u27a4<\/span> <strong>Veja:<\/strong> <span style=\"text-decoration: underline;\"><a href=\"https:\/\/mathority.org\/pt\/funcao-seno\/\">Caracter\u00edsticas da fun\u00e7\u00e3o seno<\/a><\/span> <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"funcion-acotada-superiormente\"><\/span>fun\u00e7\u00e3o limitada acima<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> No entanto, nem todas as fun\u00e7\u00f5es s\u00e3o limitadas acima e abaixo; uma fun\u00e7\u00e3o s\u00f3 pode ser limitada acima ou abaixo.<\/p>\n<p> As <strong>fun\u00e7\u00f5es limitadas acima<\/strong> s\u00e3o aquelas que n\u00e3o ultrapassam um determinado valor, ou seja, a seguinte condi\u00e7\u00e3o \u00e9 atendida:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-d1b0912c8106b6c93144cda220414684_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)\\leq K\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"74\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> onde o valor K \u00e9 o limite superior da fun\u00e7\u00e3o.<\/p>\n<p> Por exemplo, a seguinte <span style=\"text-decoration: underline;\"><a href=\"https:\/\/mathority.org\/pt\/funcao-de-parabola-quadratica\/\">par\u00e1bola<\/a><\/span> \u00e9 limitada na parte superior por K=7, mas a fun\u00e7\u00e3o n\u00e3o \u00e9 limitada na parte inferior, uma vez que os seus ramos se estendem at\u00e9 ao infinito. <\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/uploads\/2023\/07\/exercice-resolu-etape-par-etape-de-la-fonction-quadratique.webp\" alt=\"\" class=\"wp-image-139\" width=\"279\" height=\"334\" srcset=\"\" sizes=\"auto, \"><\/figure>\n<\/div>\n<p> Logicamente, se a fun\u00e7\u00e3o for limitada por K=7, ela tamb\u00e9m ser\u00e1 limitada por K=8 e valores superiores.<\/p>\n<p> O menor limite superior \u00e9 chamado de limite superior e \u00e9 representado por <em>sup(f)<\/em> . Al\u00e9m disso, se a fun\u00e7\u00e3o atingir o referido limite superior no seu dom\u00ednio, diremos que este ponto \u00e9 o <strong>m\u00e1ximo absoluto<\/strong> da fun\u00e7\u00e3o.<\/p>\n<p> <span style=\"color:#ff951b\">\u27a4<\/span> <strong>Veja:<\/strong> <span style=\"text-decoration: underline;\"><a href=\"https:\/\/mathority.org\/pt\/maximos-minimos-de-uma-funcao-extremos-relativos\/\">quais s\u00e3o os m\u00e1ximos e m\u00ednimos de uma fun\u00e7\u00e3o?<\/a><\/span><\/p>\n<p> No nosso caso, a fun\u00e7\u00e3o \u00e9 geometricamente limitada por K=7, sendo portanto o extremo superior e o m\u00e1ximo absoluto da fun\u00e7\u00e3o. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"funcion-acotada-inferiormente\"><\/span>fun\u00e7\u00e3o delimitada abaixo<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> As <strong>fun\u00e7\u00f5es delimitadas a seguir<\/strong> s\u00e3o aquelas que n\u00e3o possuem valor inferior a um determinado n\u00famero, ou seja, satisfazem a seguinte express\u00e3o matem\u00e1tica:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-6428bb46a6513be54693aaeb3c70fdc3_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)\\geq K\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"74\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Onde o valor K \u00e9 o limite inferior da fun\u00e7\u00e3o.<\/p>\n<p> Abaixo voc\u00ea tem a representa\u00e7\u00e3o gr\u00e1fica de uma fun\u00e7\u00e3o exponencial que \u00e9 delimitada abaixo por K=3: <\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/uploads\/2023\/07\/probleme-de-fonction-exponentielle.webp\" alt=\"\" class=\"wp-image-253\" width=\"264\" height=\"321\" srcset=\"\" sizes=\"auto, \"><\/figure>\n<\/div>\n<p> Obviamente, a fun\u00e7\u00e3o tamb\u00e9m \u00e9 limitada por valores menores que K=3.<\/p>\n<p> Como antes, o maior limite inferior \u00e9 chamado de limite inferior e \u00e9 representado por <em>inf(f)<\/em> . Al\u00e9m disso, se a fun\u00e7\u00e3o atingir o referido extremo inferior no seu dom\u00ednio, diremos que este ponto \u00e9 o <strong>m\u00ednimo absoluto<\/strong> da fun\u00e7\u00e3o.<\/p>\n<p> Neste caso, K=3 n\u00e3o \u00e9 o m\u00ednimo absoluto da fun\u00e7\u00e3o, pois a fun\u00e7\u00e3o atinge este valor no infinito e, portanto, est\u00e1 fora do seu dom\u00ednio. Em outras palavras, f(x)=3 \u00e9 uma <span style=\"text-decoration: underline;\"><a href=\"https:\/\/mathority.org\/pt\/assintota-horizontal\/\">ass\u00edntota horizontal da fun\u00e7\u00e3o<\/a><\/span> .<\/p>\n<p> Existe um teorema que permite saber se uma fun\u00e7\u00e3o \u00e9 limitada na parte superior e inferior sem sua representa\u00e7\u00e3o gr\u00e1fica. Clique aqui para ver o que \u00e9 o teorema de Weierstrass.<\/p>\n<p> <span style=\"color:#ff951b\">\u27a4<\/span> <strong>Veja:<\/strong> <span style=\"text-decoration: underline;\"><a href=\"https:\/\/mathority.org\/pt\/teorema-de-weierstrass\/\">Teorema de Weierstrass<\/a><\/span> <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"funcion-acotada-en-un-punto\"><\/span> Fun\u00e7\u00e3o limitada em um ponto<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Acabamos de estudar a no\u00e7\u00e3o de delimita\u00e7\u00e3o de uma fun\u00e7\u00e3o em geral, mas tamb\u00e9m \u00e9 poss\u00edvel analisar se uma fun\u00e7\u00e3o \u00e9 ou n\u00e3o limitada numa vizinhan\u00e7a menor, ou seja, numa parte da fun\u00e7\u00e3o.<\/p>\n<p> Sim<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"a\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 um ponto no dom\u00ednio da fun\u00e7\u00e3o e<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-c409433a9e2dfcdb83360a974d243f18_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"r\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"8\" style=\"vertical-align: 0px;\"><\/p>\n<p> qualquer valor, diremos que a fun\u00e7\u00e3o \u00e9 limitada acima\/abaixo no ponto<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"a\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"><\/p>\n<p> se houver um ambiente<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-35809b342e97743c17fcf00c8f1fcaa9_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"V(a,r)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"53\" style=\"vertical-align: -5px;\"><\/p>\n<p> onde a fun\u00e7\u00e3o \u00e9 limitada acima\/abaixo.<\/p>\n<p> Portanto, uma <strong>fun\u00e7\u00e3o \u00e9 limitada no ponto<\/strong><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"a\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"><\/p>\n<p> se for delimitado na parte superior e inferior de uma vizinhan\u00e7a<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-bad21933de1c285515285d51686beea1_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"V(a,r).\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"58\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Obviamente, se uma fun\u00e7\u00e3o \u00e9 limitada em geral, tamb\u00e9m o ser\u00e1 em cada um dos seus pontos. Por\u00e9m, o oposto \u00e9 falso, ou seja, uma fun\u00e7\u00e3o pode ser limitada em cada um dos seus pontos e n\u00e3o em todo o seu dom\u00ednio.<\/p>\n<p> Por exemplo, a seguinte fun\u00e7\u00e3o afim \u00e9 parcialmente limitada em cada um dos seus pontos, mas n\u00e3o \u00e9 uma fun\u00e7\u00e3o limitada. <\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/uploads\/2023\/07\/exemple-de-representation-d-une-fonction-lineaire-ou-affine.webp\" alt=\"\" class=\"wp-image-104\" width=\"263\" height=\"265\" srcset=\"\" sizes=\"auto, \"><\/figure>\n<\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"propiedades-de-las-funciones-acotadas\"><\/span> Propriedades de fun\u00e7\u00f5es limitadas<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Fun\u00e7\u00f5es limitadas t\u00eam as seguintes propriedades:<\/p>\n<ul>\n<li> Sim\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a7ee323bc5a3f73ad5e066b13bed5504_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"34\" style=\"vertical-align: -5px;\"><\/p>\n<p> E<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-6a5054ad96fb0978182340eb214bb125_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"g(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"32\" style=\"vertical-align: -5px;\"><\/p>\n<p> s\u00e3o duas fun\u00e7\u00f5es limitadas, a adi\u00e7\u00e3o (ou subtra\u00e7\u00e3o) das duas fun\u00e7\u00f5es<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-e24299805ed877ea052cd135c96e7c28_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)\\pm g(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"88\" style=\"vertical-align: -5px;\"><\/p>\n<p> tamb\u00e9m \u00e9 uma fun\u00e7\u00e3o limitada.<\/li>\n<li> Sim\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a7ee323bc5a3f73ad5e066b13bed5504_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"34\" style=\"vertical-align: -5px;\"><\/p>\n<p> E<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-6a5054ad96fb0978182340eb214bb125_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"g(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"32\" style=\"vertical-align: -5px;\"><\/p>\n<p> s\u00e3o duas fun\u00e7\u00f5es limitadas, o produto das duas fun\u00e7\u00f5es<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-d47b381826b8c5e901bf202b6d4b14c8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)\\cdot g(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"79\" style=\"vertical-align: -5px;\"><\/p>\n<p> tamb\u00e9m \u00e9 uma fun\u00e7\u00e3o limitada.<\/li>\n<li> Se uma fun\u00e7\u00e3o tiver uma ass\u00edntota vertical, ela n\u00e3o pode ser totalmente limitada. Por outro lado, a fun\u00e7\u00e3o pode ser limitada acima ou abaixo.<\/li>\n<li> Qualquer fun\u00e7\u00e3o cont\u00ednua e limitada em um intervalo \u00e9 integr\u00e1vel.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Neste artigo explicamos o que s\u00e3o fun\u00e7\u00f5es limitadas (superiores e inferiores). Al\u00e9m disso, mostraremos o que significa uma fun\u00e7\u00e3o ser limitada em um ponto e, por fim, voc\u00ea encontrar\u00e1 as propriedades desse tipo de fun\u00e7\u00e3o. O que \u00e9 uma fun\u00e7\u00e3o limitada? Uma fun\u00e7\u00e3o limitada \u00e9 uma fun\u00e7\u00e3o cujo gr\u00e1fico est\u00e1 dentro dos limites. Ou seja, &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/mathority.org\/pt\/funcoes-limitadas\/\"> <span class=\"screen-reader-text\">Fun\u00e7\u00f5es limitadas<\/span> Leia mais &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"","footnotes":""},"categories":[22],"tags":[],"class_list":["post-365","post","type-post","status-publish","format-standard","hentry","category-representacao-de-funcao"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Fun\u00e7\u00f5es limitadas - Mathority<\/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:\/\/mathority.org\/pt\/funcoes-limitadas\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fun\u00e7\u00f5es limitadas - Mathority\" \/>\n<meta property=\"og:description\" content=\"Neste artigo explicamos o que s\u00e3o fun\u00e7\u00f5es limitadas (superiores e inferiores). Al\u00e9m disso, mostraremos o que significa uma fun\u00e7\u00e3o ser limitada em um ponto e, por fim, voc\u00ea encontrar\u00e1 as propriedades desse tipo de fun\u00e7\u00e3o. O que \u00e9 uma fun\u00e7\u00e3o limitada? Uma fun\u00e7\u00e3o limitada \u00e9 uma fun\u00e7\u00e3o cujo gr\u00e1fico est\u00e1 dentro dos limites. 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