{"id":637,"date":"2024-04-29T13:13:34","date_gmt":"2024-04-29T13:13:34","guid":{"rendered":"https:\/\/www.ilsupereserciziario.it\/home\/?p=637"},"modified":"2025-04-24T14:47:40","modified_gmt":"2025-04-24T14:47:40","slug":"esercizio-2-ordine-di-un-gruppo","status":"publish","type":"post","link":"https:\/\/www.ilsupereserciziario.it\/home\/universita\/esercizio-2-ordine-di-un-gruppo\/","title":{"rendered":"Esercizio 2 &#8211; Ordine di un gruppo"},"content":{"rendered":"<p><head><meta name=\"viewport\" content=\"width=1060px, maximum-scale=1.0\" \/><\/head><\/p>\n<div style=\"padding: 10px; background-color: #abb8c3;\"><strong style=\"color: #000000#;\"> Esercizio 2.<\/strong> <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ilsupereserciziario.it\/home\/wp-content\/ql-cache\/quicklatex.com-1878e4f41f2f4cc0b2094de41ad3c89c_l3.png\" class=\"ql-img-inline-formula \" alt=\" &#40;&#92;&#98;&#105;&#103;&#115;&#116;&#97;&#114;&#92;&#108;&#97;&#114;&#103;&#101;&#119;&#104;&#105;&#116;&#101;&#115;&#116;&#97;&#114;&#92;&#108;&#97;&#114;&#103;&#101;&#119;&#104;&#105;&#116;&#101;&#115;&#116;&#97;&#114;&#41;\" title=\"Rendered by QuickLaTeX.com\" height=\"21\" width=\"86\" style=\"vertical-align: -5px;\"\/><br \/>\nSia <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ilsupereserciziario.it\/home\/wp-content\/ql-cache\/quicklatex.com-aca66b6ed63fe3309b1fb1288395ea4b_l3.png\" class=\"ql-img-inline-formula \" alt=\"&#71;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"15\" style=\"vertical-align: 0px;\"\/> un gruppo e sia <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ilsupereserciziario.it\/home\/wp-content\/ql-cache\/quicklatex.com-ee315844020da1cf8b1713b95c4ea262_l3.png\" class=\"ql-img-inline-formula \" alt=\"&#97;&#32;&#92;&#105;&#110;&#32;&#71;\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"48\" style=\"vertical-align: -1px;\"\/> di ordine <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ilsupereserciziario.it\/home\/wp-content\/ql-cache\/quicklatex.com-e5e9e37cfca8a13c47ff26d9ae6222c6_l3.png\" class=\"ql-img-inline-formula \" alt=\"&#110;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"11\" style=\"vertical-align: 0px;\"\/>.<br \/>\na) Provare che <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ilsupereserciziario.it\/home\/wp-content\/ql-cache\/quicklatex.com-a17a6f441ba53d1f3745ed57d141e23b_l3.png\" class=\"ql-img-inline-formula \" alt=\"&#40;&#98;&#97;&#98;&#94;&#123;&#45;&#49;&#125;&#41;&#94;&#110;&#61;&#101;\" title=\"Rendered by QuickLaTeX.com\" height=\"22\" width=\"103\" style=\"vertical-align: -5px;\"\/>;<br \/>\nb) Provare che l&#8217;ordine <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ilsupereserciziario.it\/home\/wp-content\/ql-cache\/quicklatex.com-6108f73f6f49cbb7d059846206ea880e_l3.png\" class=\"ql-img-inline-formula \" alt=\"&#98;&#97;&#98;&#94;&#123;&#45;&#49;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"44\" style=\"vertical-align: 0px;\"\/> \u00e8 esattamente <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ilsupereserciziario.it\/home\/wp-content\/ql-cache\/quicklatex.com-e5e9e37cfca8a13c47ff26d9ae6222c6_l3.png\" class=\"ql-img-inline-formula \" alt=\"&#110;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"11\" style=\"vertical-align: 0px;\"\/>.\n<\/div>\n<p><strong>Svolgimento. <\/strong><br \/>\na) Dobbiamo provare che <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ilsupereserciziario.it\/home\/wp-content\/ql-cache\/quicklatex.com-a17a6f441ba53d1f3745ed57d141e23b_l3.png\" class=\"ql-img-inline-formula \" alt=\"&#40;&#98;&#97;&#98;&#94;&#123;&#45;&#49;&#125;&#41;&#94;&#110;&#61;&#101;\" title=\"Rendered by QuickLaTeX.com\" height=\"22\" width=\"103\" style=\"vertical-align: -5px;\"\/>.<br \/>\nL&#8217;uguaglianza di sinistra pu\u00f2 essere scritta come <\/p>\n<p class=\"ql-left-displayed-equation\" style=\"line-height: 204px;\"><span class=\"ql-right-eqno\"> &nbsp; <\/span><span class=\"ql-left-eqno\"> &nbsp; <\/span><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ilsupereserciziario.it\/home\/wp-content\/ql-cache\/quicklatex.com-ea92487d8371a9d4c61d13c0df870861_l3.png\" height=\"204\" width=\"371\" class=\"ql-img-displayed-equation \" alt=\"&#92;&#98;&#101;&#103;&#105;&#110;&#123;&#101;&#113;&#110;&#97;&#114;&#114;&#97;&#121;&#42;&#125; &#38;&#40;&#98;&#97;&#98;&#94;&#123;&#45;&#49;&#125;&#41;&#94;&#110;&#32;&#38;&#61;&#92;&#117;&#110;&#100;&#101;&#114;&#98;&#114;&#97;&#99;&#101;&#123;&#98;&#97;&#98;&#94;&#123;&#45;&#49;&#125;&#92;&#99;&#100;&#111;&#116;&#32;&#98;&#97;&#98;&#94;&#123;&#45;&#49;&#125;&#92;&#99;&#100;&#111;&#116;&#32;&#98;&#97;&#98;&#94;&#123;&#45;&#49;&#125;&#46;&#46;&#46;&#92;&#99;&#100;&#111;&#116;&#32;&#98;&#97;&#98;&#94;&#123;&#45;&#49;&#125;&#125;&#95;&#123;&#110;&#32;&#92;&#32;&#118;&#111;&#108;&#116;&#101;&#125; &#92;&#92;&#32;&#38;&#38;&#61;&#32;&#98;&#97;&#92;&#117;&#110;&#100;&#101;&#114;&#98;&#114;&#97;&#99;&#101;&#123;&#40;&#98;&#94;&#123;&#45;&#49;&#125;&#98;&#41;&#125;&#95;&#101;&#97;&#92;&#117;&#110;&#100;&#101;&#114;&#98;&#114;&#97;&#99;&#101;&#123;&#40;&#98;&#94;&#123;&#45;&#49;&#125;&#98;&#41;&#125;&#95;&#101;&#92;&#99;&#100;&#111;&#116;&#46;&#46;&#46;&#92;&#99;&#100;&#111;&#116;&#32;&#92;&#117;&#110;&#100;&#101;&#114;&#98;&#114;&#97;&#99;&#101;&#123;&#40;&#98;&#94;&#123;&#45;&#49;&#125;&#98;&#41;&#125;&#95;&#101;&#97;&#98;&#94;&#123;&#45;&#49;&#125; &#92;&#92;&#32;&#38;&#38;&#61;&#98;&#97;&#92;&#99;&#100;&#111;&#116;&#32;&#101;&#92;&#99;&#100;&#111;&#116;&#32;&#97;&#92;&#99;&#100;&#111;&#116;&#46;&#46;&#46;&#92;&#99;&#100;&#111;&#116;&#32;&#101;&#92;&#99;&#100;&#111;&#116;&#32;&#97;&#98; &#92;&#92;&#38;&#38;&#61;&#98;&#97;&#94;&#110;&#98;&#94;&#123;&#45;&#49;&#125; &#92;&#92;&#38;&#38;&#61;&#98;&#101;&#98;&#94;&#123;&#45;&#49;&#125;&#32;&#92;&#32;&#92;&#32;&#92;&#32;&#92;&#32;&#92;&#116;&#101;&#120;&#116;&#123;&#112;&#101;&#114;&#32;&#105;&#112;&#111;&#116;&#101;&#115;&#105;&#125;&#32;&#92;&#32;&#97;&#94;&#110;&#61;&#101; &#92;&#92;&#38;&#38;&#61;&#98;&#98;&#94;&#123;&#45;&#49;&#125;&#61;&#101; &#92;&#101;&#110;&#100;&#123;&#101;&#113;&#110;&#97;&#114;&#114;&#97;&#121;&#42;&#125;\" title=\"Rendered by QuickLaTeX.com\"\/><\/p>\n<p>come richiesto.<br \/>\nb) Grazie al punto precedente, sappiamo che l&#8217;ordine di <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ilsupereserciziario.it\/home\/wp-content\/ql-cache\/quicklatex.com-6108f73f6f49cbb7d059846206ea880e_l3.png\" class=\"ql-img-inline-formula \" alt=\"&#98;&#97;&#98;&#94;&#123;&#45;&#49;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"44\" style=\"vertical-align: 0px;\"\/> non \u00e8 maggiore di <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ilsupereserciziario.it\/home\/wp-content\/ql-cache\/quicklatex.com-e5e9e37cfca8a13c47ff26d9ae6222c6_l3.png\" class=\"ql-img-inline-formula \" alt=\"&#110;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"11\" style=\"vertical-align: 0px;\"\/>.<br \/>\nSupponiamo ora per assurdo che l&#8217;ordine di <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ilsupereserciziario.it\/home\/wp-content\/ql-cache\/quicklatex.com-6108f73f6f49cbb7d059846206ea880e_l3.png\" class=\"ql-img-inline-formula \" alt=\"&#98;&#97;&#98;&#94;&#123;&#45;&#49;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"44\" style=\"vertical-align: 0px;\"\/> sia <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ilsupereserciziario.it\/home\/wp-content\/ql-cache\/quicklatex.com-b4a173061433b580fb97f445fa9c2614_l3.png\" class=\"ql-img-inline-formula \" alt=\"&#109;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"16\" style=\"vertical-align: 0px;\"\/> con <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ilsupereserciziario.it\/home\/wp-content\/ql-cache\/quicklatex.com-4f5016a0c8345ba2f547c3714eea9f38_l3.png\" class=\"ql-img-inline-formula \" alt=\"&#109;&#32;&#60;&#32;&#110;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"53\" style=\"vertical-align: -2px;\"\/>, deve essere<\/p>\n<p class=\"ql-left-displayed-equation\" style=\"line-height: 23px;\"><span class=\"ql-right-eqno\"> &nbsp; <\/span><span class=\"ql-left-eqno\"> &nbsp; <\/span><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ilsupereserciziario.it\/home\/wp-content\/ql-cache\/quicklatex.com-62d610d838cc8013d0121a7977b9fa5d_l3.png\" height=\"23\" width=\"202\" class=\"ql-img-displayed-equation \" alt=\"&#92;&#98;&#101;&#103;&#105;&#110;&#123;&#101;&#113;&#110;&#97;&#114;&#114;&#97;&#121;&#42;&#125; &#38;&#101;&#61;&#40;&#98;&#97;&#98;&#94;&#123;&#45;&#49;&#125;&#41;&#94;&#109;&#32;&#38;&#61;&#98;&#97;&#94;&#109;&#98;&#94;&#123;&#45;&#49;&#125; &#92;&#101;&#110;&#100;&#123;&#101;&#113;&#110;&#97;&#114;&#114;&#97;&#121;&#42;&#125;\" title=\"Rendered by QuickLaTeX.com\"\/><\/p>\n<p>Di conseguenza si ha <\/p>\n<p class=\"ql-left-displayed-equation\" style=\"line-height: 103px;\"><span class=\"ql-right-eqno\"> &nbsp; <\/span><span class=\"ql-left-eqno\"> &nbsp; <\/span><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ilsupereserciziario.it\/home\/wp-content\/ql-cache\/quicklatex.com-e31617d5afdede92179e15eff98bfda2_l3.png\" height=\"103\" width=\"168\" class=\"ql-img-displayed-equation \" alt=\"&#92;&#98;&#101;&#103;&#105;&#110;&#123;&#101;&#113;&#110;&#97;&#114;&#114;&#97;&#121;&#42;&#125; &#38;&#101;&#38;&#61;&#98;&#94;&#123;&#45;&#49;&#125;&#101;&#98; &#92;&#92;&#38;&#38;&#32;&#61;&#98;&#94;&#123;&#45;&#49;&#125;&#40;&#98;&#97;&#94;&#109;&#98;&#94;&#123;&#45;&#49;&#125;&#41;&#98; &#92;&#92;&#38;&#38;&#32;&#61;&#40;&#98;&#94;&#123;&#45;&#49;&#125;&#98;&#41;&#97;&#94;&#109;&#40;&#98;&#94;&#123;&#45;&#49;&#125;&#98;&#41; &#92;&#92;&#38;&#38;&#32;&#61;&#97;&#94;&#109;&#32; &#92;&#101;&#110;&#100;&#123;&#101;&#113;&#110;&#97;&#114;&#114;&#97;&#121;&#42;&#125;\" title=\"Rendered by QuickLaTeX.com\"\/><\/p>\n<p>Questo implica che l&#8217;ordine di <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ilsupereserciziario.it\/home\/wp-content\/ql-cache\/quicklatex.com-477f63b50bad9c2f4101a6e4ecdff30a_l3.png\" class=\"ql-img-inline-formula \" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"10\" style=\"vertical-align: 0px;\"\/> sia minore di n, in contraddizione con l&#8217;ipotesi che l&#8217;elemento <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ilsupereserciziario.it\/home\/wp-content\/ql-cache\/quicklatex.com-477f63b50bad9c2f4101a6e4ecdff30a_l3.png\" class=\"ql-img-inline-formula \" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"10\" style=\"vertical-align: 0px;\"\/> sia esattamente <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ilsupereserciziario.it\/home\/wp-content\/ql-cache\/quicklatex.com-e5e9e37cfca8a13c47ff26d9ae6222c6_l3.png\" class=\"ql-img-inline-formula \" alt=\"&#110;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"11\" style=\"vertical-align: 0px;\"\/>. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Esercizio 2. Sia un gruppo e sia di ordine . a) Provare che ; b) Provare che l&#8217;ordine \u00e8 esattamente . Svolgimento. a) Dobbiamo provare che . L&#8217;uguaglianza di sinistra pu\u00f2 essere scritta come &nbsp; &nbsp; come richiesto. b) Grazie al punto precedente, sappiamo che l&#8217;ordine di non \u00e8 maggiore di . Supponiamo ora per [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"blank","format":"standard","meta":{"footnotes":""},"categories":[9,37,1],"tags":[10],"class_list":["post-637","post","type-post","status-publish","format-standard","hentry","category-algebra","category-gruppi","category-universita","tag-algebra"],"_links":{"self":[{"href":"https:\/\/www.ilsupereserciziario.it\/home\/wp-json\/wp\/v2\/posts\/637","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ilsupereserciziario.it\/home\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ilsupereserciziario.it\/home\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ilsupereserciziario.it\/home\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ilsupereserciziario.it\/home\/wp-json\/wp\/v2\/comments?post=637"}],"version-history":[{"count":25,"href":"https:\/\/www.ilsupereserciziario.it\/home\/wp-json\/wp\/v2\/posts\/637\/revisions"}],"predecessor-version":[{"id":1638,"href":"https:\/\/www.ilsupereserciziario.it\/home\/wp-json\/wp\/v2\/posts\/637\/revisions\/1638"}],"wp:attachment":[{"href":"https:\/\/www.ilsupereserciziario.it\/home\/wp-json\/wp\/v2\/media?parent=637"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ilsupereserciziario.it\/home\/wp-json\/wp\/v2\/categories?post=637"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ilsupereserciziario.it\/home\/wp-json\/wp\/v2\/tags?post=637"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}