{"id":9134,"date":"2024-07-08T17:40:33","date_gmt":"2024-07-08T08:40:33","guid":{"rendered":"https:\/\/home.hirosaki-u.ac.jp\/relativity\/?page_id=9134"},"modified":"2024-07-09T12:19:48","modified_gmt":"2024-07-09T03:19:48","slug":"%e8%a4%87%e7%b4%a0%e3%83%95%e3%83%bc%e3%83%aa%e3%82%a8%e4%bf%82%e6%95%b0%e3%82%92%e6%b1%82%e3%82%81%e3%82%8b%e4%be%8b%e9%a1%8c","status":"publish","type":"page","link":"https:\/\/home.hirosaki-u.ac.jp\/relativity\/%e7%90%86%e5%b7%a5%e7%b3%bb%e3%81%ae%e6%95%b0%e5%ad%a6c\/%e3%83%95%e3%83%bc%e3%83%aa%e3%82%a8%e8%a7%a3%e6%9e%90\/%e8%a4%87%e7%b4%a0%e3%83%95%e3%83%bc%e3%83%aa%e3%82%a8%e7%b4%9a%e6%95%b0\/%e8%a4%87%e7%b4%a0%e3%83%95%e3%83%bc%e3%83%aa%e3%82%a8%e4%bf%82%e6%95%b0%e3%82%92%e6%b1%82%e3%82%81%e3%82%8b%e4%be%8b%e9%a1%8c\/","title":{"rendered":"\u8907\u7d20\u30d5\u30fc\u30ea\u30a8\u4fc2\u6570\u3092\u6c42\u3081\u308b\u4f8b\u984c"},"content":{"rendered":"<p><!--more--><\/p>\n<h3>\u4f8b\u984c 1<\/h3>\n<p>$ -\\pi \\le x \\le \\pi$ \u3067\u5b9a\u7fa9\u3055\u308c\u305f\u95a2\u6570 $f(x) = x^2$ \u304c\uff0c\u533a\u9593\u5916\u3067\u5468\u671f $2 \\pi$ \u306e\u5468\u671f\u95a2\u6570\u3067\u3042\u308b\u3068\u304d\uff0c\u8907\u7d20\u30d5\u30fc\u30ea\u30a8\u4fc2\u6570 $c_n$ \u3092\u6c42\u3081\u3088\u3002<\/p>\n<h4>\u89e3\u7b54\u4f8b<\/h4>\n<p>\u8907\u7d20\u30d5\u30fc\u30ea\u30a8\u7d1a\u6570\u306e\u516c\u5f0f\u3067 $L = \\pi, \\ f(x) = x^2$ \u3068\u3057\u3066\uff0c<\/p>\n<p>\\begin{eqnarray}<br \/>\nf(x) = x^2 &amp;=&amp; \\sum_{n=-\\infty}^{\\infty} c_n \\, e^{i n x} \\\\<br \/>\nc_n &amp;=&amp; \\frac{1}{2 \\pi} \\int_{-\\pi}^{\\pi} x^2 \\, e^{-i n x} \\, dx<br \/>\n\\end{eqnarray}<\/p>\n<p>\u307e\u305a\uff0c$n=0$ \u306e\u3068\u304d\u306f<\/p>\n<p>$$c_0 = \\frac{1}{2\\pi} \\int_{-\\pi}^{\\pi} x^2\\, dx = \\frac{1}{2\\pi}\\,\\biggl[ \\frac{x^3}{3}\\biggr]_{-\\pi}^{\\pi} = \\frac{\\pi^2}{3}$$<\/p>\n<p>$n \\neq 0$ \u306e\u5834\u5408\u306f\u90e8\u5206\u7a4d\u5206\u30922\u56de\u307b\u3069\u3084\u3063\u3066&#8230;<\/p>\n<p>\\begin{eqnarray}<br \/>\nc_n &amp;=&amp; \\frac{1}{2 \\pi} \\int_{- \\pi}^{\\pi} x^2 \\, e^{- i n x} \\, dx \\\\<br \/>\n&amp;=&amp; \\frac{1}{2 \\pi} \\left\\{ \\biggl[ x^2 \\, \\frac{e^{-i n x}}{-i n}\\biggr]_{-\\pi}^{\\pi} -\\int_{-\\pi}^{\\pi} 2 x\u00a0 \\frac{e^{-i n x}}{-i n} \\, dx\\right\\} \\\\<br \/>\n&amp;=&amp; \\frac{1}{2 \\pi} \\left\\{ \\biggl[ x^2 \\, \\frac{e^{-i n x}}{-i n}\\biggr]_{-\\pi}^{\\pi}<br \/>\n-\\biggl[2 x\u00a0 \\frac{e^{-i n x}}{(-i n)^2} \\biggr]_{-\\pi}^{\\pi} +\\int_{-\\pi}^{\\pi} 2\u00a0\u00a0 \\frac{e^{-i n x}}{(-i n)^2} \\, dx\\right\\}\\\\<br \/>\n&amp;=&amp; \\frac{1}{2 \\pi} \\left\\{ \\biggl[ x^2 \\, \\frac{e^{-i n x}}{-i n}\\biggr]_{-\\pi}^{\\pi}<br \/>\n-\\biggl[2 x\u00a0 \\frac{e^{-i n x}}{(-i n)^2} \\biggr]_{-\\pi}^{\\pi}<br \/>\n+\\biggl[2\u00a0 \\frac{e^{-i n x}}{(-i n)^3} \\biggr]_{-\\pi}^{\\pi} \\right\\}\\\\<br \/>\n&amp;=&amp;\\frac{1}{2\\pi} \\biggl[\\left(\\frac{x^2}{-i n} &#8211; \\frac{2x}{(-i n)^2} + \\frac{2}{(-i n)^3} \\right)\u00a0 e^{-i n x}\\biggr]_{-\\pi}^{\\pi} \\\\<br \/>\n&amp;=&amp; \\frac{2\\cdot (-1)^n}{n^2}<br \/>\n\\end{eqnarray}<\/p>\n<p>\u3053\u3053\u3067\uff0c<\/p>\n<p>\\begin{eqnarray}<br \/>\ne^{-i n \\pi} &amp;=&amp; \\cos (n \\pi) -i \\sin (n \\pi) \\\\<br \/>\n&amp;=&amp; (-1)^n \\\\<br \/>\ne^{i n \\pi} &amp;=&amp;(-1)^n<br \/>\n\\end{eqnarray}<\/p>\n<p>\u3068\u306a\u308b\u3053\u3068\u3092\u4f7f\u3063\u305f\u3002<\/p>\n<p>\u8907\u7d20\u30d5\u30fc\u30ea\u30a8\u4fc2\u6570 $c_n$ \u306f\u4ee5\u4e0a\u306e\u3088\u3046\u306b\u3057\u3066\u6c42\u307e\u3063\u305f\u306e\u3067\uff0c\u3042\u3089\u305f\u3081\u3066\u8907\u7d20\u30d5\u30fc\u30ea\u30a8\u7d1a\u6570\u3092\u66f8\u3044\u3066\u307f\u308b\u3068\uff0c<\/p>\n<p>\\begin{eqnarray}<br \/>\nf(x) = x^2 &amp;=&amp; \\sum_{n=-\\infty}^{\\infty} c_n \\, e^{i n x} \\\\<br \/>\n&amp;=&amp; c_0 + \\sum_{n=1}^{\\infty} \\left\\{\\frac{2\\cdot (-1)^n}{n^2} \\, e^{i n x} + \\frac{2\\cdot (-1)^{(-n)}}{(-n)^2} \\, e^{-i n x} \\right\\}\\\\<br \/>\n&amp;=&amp; c_0\u00a0 + c_{+1}\\, e^{+ i x} \\ \\\u00a0 + c_{+2}\\,e^{+2 i x} \\ \\ + c_{+3}\\, e^{+3 i x} + \\cdots \\\\<br \/>\n&amp;&amp;\\ \\ \\ \\, + c_{ -1}\\, e^{ -i x} \\ \\ + c_{-2}\\,e^{-2 i x} \\ \\ + c_{-3}\\, e^{-3 i x} + \\cdots \\\\<br \/>\n&amp;=&amp; \\frac{\\pi^2}{3} -2 \\left(e^{+ i x} +e^{- i x} \\right) + \\frac{1}{2} \\left(e^{+2 i x} +e^{- 2 i x} \\right) &#8211; \\frac{2}{9} \\left(e^{+3 i x} +e^{- 3 i x} \\right) + \\cdots \\\\<br \/>\n&amp;=&amp; \\frac{\\pi^2}{3} -4 \\cos x + \\cos 2 x -\\frac{4}{9} \\cos 3 x + \\cdots<br \/>\n\\end{eqnarray}<\/p>\n<ul>\n<li>\u53c2\u8003\uff1a<a href=\"https:\/\/home.hirosaki-u.ac.jp\/relativity\/%e7%90%86%e5%b7%a5%e7%b3%bb%e3%81%ae%e6%95%b0%e5%ad%a6c\/%e3%83%95%e3%83%bc%e3%83%aa%e3%82%a8%e8%a7%a3%e6%9e%90\/%e3%83%95%e3%83%bc%e3%83%aa%e3%82%a8%e7%b4%9a%e6%95%b0\/%e5%91%a8%e6%9c%9f-2pi-%e3%81%ae%e3%83%95%e3%83%bc%e3%83%aa%e3%82%a8%e7%b4%9a%e6%95%b0%e5%b1%95%e9%96%8b%e3%81%ae%e4%be%8b\/\" target=\"_blank\" rel=\"noopener\">\u5468\u671f $2 \\pi$ \u306e\u30d5\u30fc\u30ea\u30a8\u7d1a\u6570\u5c55\u958b\u306e\u4f8b<\/a><\/li>\n<\/ul>\n<h3>\u4f8b\u984c 2<\/h3>\n<p>$ -1 \\le x \\le 1$ \u3067\u5b9a\u7fa9\u3055\u308c\u305f\u95a2\u6570 $f(x) = x$ \u304c\uff0c\u533a\u9593\u5916\u3067\u5468\u671f $2$ \u306e\u5468\u671f\u95a2\u6570\u3067\u3042\u308b\u3068\u304d\uff0c\u8907\u7d20\u30d5\u30fc\u30ea\u30a8\u4fc2\u6570 $c_n$ \u3092\u6c42\u3081\u3088\u3002<\/p>\n<ul>\n<li>\u53c2\u8003\uff1a<a href=\"https:\/\/home.hirosaki-u.ac.jp\/relativity\/%e7%90%86%e5%b7%a5%e7%b3%bb%e3%81%ae%e6%95%b0%e5%ad%a6c\/%e3%83%95%e3%83%bc%e3%83%aa%e3%82%a8%e8%a7%a3%e6%9e%90\/%e4%bb%bb%e6%84%8f%e3%81%ae%e5%91%a8%e6%9c%9f%e3%82%92%e3%82%82%e3%81%a4%e9%96%a2%e6%95%b0%e3%81%ae%e3%83%95%e3%83%bc%e3%83%aa%e3%82%a8%e7%b4%9a%e6%95%b0%e5%b1%95%e9%96%8b\/%e4%bb%bb%e6%84%8f%e5%91%a8%e6%9c%9f%e3%81%ae%e3%83%95%e3%83%bc%e3%83%aa%e3%82%a8%e7%b4%9a%e6%95%b0%e5%b1%95%e9%96%8b%e3%81%ae%e4%be%8b\/\" target=\"_blank\" rel=\"noopener\">\u4efb\u610f\u5468\u671f\u306e\u30d5\u30fc\u30ea\u30a8\u7d1a\u6570\u5c55\u958b\u306e\u4f8b<\/a><\/li>\n<\/ul>\n<h4>\u89e3\u7b54\u65b9\u91dd<\/h4>\n<p>\u8907\u7d20\u30d5\u30fc\u30ea\u30a8\u7d1a\u6570\u306e\u516c\u5f0f\u3067 $L = 1, \\ f(x) = x$ \u3068\u3057\u3066\uff0c<\/p>\n<p>\\begin{eqnarray}<br \/>\nf(x) = x &amp;=&amp; \\sum_{n=-\\infty}^{\\infty} c_n \\, e^{i n \\pi\\, x} \\\\<br \/>\nc_n &amp;=&amp; \\frac{1}{2} \\int_{-1}^{1} x \\, e^{-i n \\pi\\, x} \\, dx<br \/>\n\\end{eqnarray}<\/p>\n<p>\u3053\u308c\u3092\u3059\u306a\u304a\u306b\u8a08\u7b97\u3057\u3066\u3044\u304d\u307e\u3059\u3002\u7b54\u3048\u304c\u300c<a href=\"https:\/\/home.hirosaki-u.ac.jp\/relativity\/%e7%90%86%e5%b7%a5%e7%b3%bb%e3%81%ae%e6%95%b0%e5%ad%a6c\/%e3%83%95%e3%83%bc%e3%83%aa%e3%82%a8%e8%a7%a3%e6%9e%90\/%e4%bb%bb%e6%84%8f%e3%81%ae%e5%91%a8%e6%9c%9f%e3%82%92%e3%82%82%e3%81%a4%e9%96%a2%e6%95%b0%e3%81%ae%e3%83%95%e3%83%bc%e3%83%aa%e3%82%a8%e7%b4%9a%e6%95%b0%e5%b1%95%e9%96%8b\/%e4%bb%bb%e6%84%8f%e5%91%a8%e6%9c%9f%e3%81%ae%e3%83%95%e3%83%bc%e3%83%aa%e3%82%a8%e7%b4%9a%e6%95%b0%e5%b1%95%e9%96%8b%e3%81%ae%e4%be%8b\/\" target=\"_blank\" rel=\"noopener\">\u4efb\u610f\u5468\u671f\u306e\u30d5\u30fc\u30ea\u30a8\u7d1a\u6570\u5c55\u958b\u306e\u4f8b<\/a>\u300d\u306e\u30da\u30fc\u30b8\u306b\u66f8\u3044\u3066\u3042\u308b\u304b\u3089\u3068\u3044\u3063\u3066\uff0c\u624b\u3092\u629c\u304b\u305a\u306b\u4f8b\u984c 1 \u306e\u3088\u3046\u306b\u3061\u3083\u3093\u3068\u7a4d\u5206\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u8907\u7d20\u30d5\u30fc\u30ea\u30a8\u4fc2\u6570 $c_n$ \u304c\u6c42\u307e\u3063\u305f\u3089\uff0c\u3042\u3089\u305f\u3081\u3066\u8907\u7d20\u30d5\u30fc\u30ea\u30a8\u7d1a\u6570\u3082\u3064\u3089\u3064\u3089\u3068\u66f8\u3044\u3066\u307f\u308b\u3093\u3067\u3059\u3088\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":33,"featured_media":0,"parent":2368,"menu_order":10,"comment_status":"closed","ping_status":"closed","template":"","meta":{"inline_featured_image":false,"footnotes":""},"class_list":["post-9134","page","type-page","status-publish","hentry","nodate","item-wrap"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u4f8b\u984c 1 $ -\\pi \\le x \\le \\pi$ \u3067\u5b9a\u7fa9\u3055\u308c\u305f\u95a2\u6570 $f(x) = x^2$ \u304c\uff0c\u533a\u9593\u5916\u3067\" 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