{"id":8771,"date":"2009-11-04T14:44:00","date_gmt":"2009-11-04T14:44:00","guid":{"rendered":"http:\/\/melotopia.net\/b\/?p=8771"},"modified":"2009-11-04T14:44:00","modified_gmt":"2009-11-04T14:44:00","slug":"%ed%95%a8%ec%88%98-%ea%b3%b5%ea%b0%84%ec%9d%98-%ec%b0%a8%ec%9b%90","status":"publish","type":"post","link":"http:\/\/melotopia.net\/b\/?p=8771","title":{"rendered":"\ud568\uc218 \uacf5\uac04\uc758 \ucc28\uc6d0"},"content":{"rendered":"
\n \ub204\uac00 \ubc29\uba85\ub85d\uc5d0 \ubb3c\uc5b4\ubd10\uc11c…<\/p>\n

\uc2e4\uc218 \ud568\uc218 \uacf5\uac04\uc758 \ucc28\uc6d0\uc740 \ubb34\ud55c\ub300\uc774\ub2e4. \uac04\ub2e8\ud788 \uc99d\uba85\ud574 \ubcf4\uc790.<\/p>\n

\uc77c\ub2e8 \uc5b4\ub514\uc11c \ubb58 \uac16\uace0 \ub180\uc9c0 \uc815\ud574\uc57c \ud558\ub294\ub370, \uc2e4\uc218 \uc804\uccb4 \uad6c\uac04\uc5d0\uc11c \uc2e4\uc218\ub85c \uac00\ub294 \ud568\uc218 f(x)\ub4e4 \uc911 \ubb34\ud55c\ubc88 \ubbf8\ubd84 \uac00\ub2a5\ud558\uace0 f(x)\uc758 \uc808\ub300\uac12\uc758 \uc81c\uacf1\uc744 \uc2e4\uc218 \uc804\uccb4\ub97c \ub300\uc0c1\uc73c\ub85c \ud558\uc5ec \uc801\ubd84\ud558\ub354\ub77c\ub3c4 \uadf8 \uc801\ubd84\uac12\uc774 \ubb34\ud55c\ub300\ub85c \ubc1c\uc0b0\ud558\uc9c0 \uc54a\ub294, \uc989, \uc5b4\ub5a4 \ud2b9\uc815\ud55c \uc2e4\uc218\ub85c \uc218\ub834\ud558\ub294 \uadf8\ub7f0 \ud568\uc218\ub4e4\ub9cc\uc744 \ub300\uc0c1\uc73c\ub85c \ud558\uc790.<\/p>\n

\uc0ac\uc2e4\uc740 \uadf8\ub0e5 \ubbf8\ubd84\ub9cc \uc798 \ub418\ub354\ub77c\ub3c4 \uc0c1\uad00 \uc5c6\uc9c0\ub9cc…-_-;<\/p>\n

\uc774\ub7f0 \ud568\uc218\ub4e4\uc740 \ud14c\uc77c\ub7ec \uae09\uc218 \uc804\uac1c\ub97c \uc774\uc6a9\ud574\uc11c \ub2e4\ud56d\uc2dd\uc73c\ub85c \uc804\uac1c\ud558\uc5ec \ub098\ud0c0\ub0bc \uc218 \uc788\ub2e4.<\/p>\n

$f(x) = a_0 + a_1 x + a_2 x^2 + a_3 x^3 + … =\\sum a_n x^n$
\n
\n \ud14c\uc77c\ub7ec \uae09\uc218 \uc804\uac1c\uc5d0\uc11c $a_n$\ub4e4\uc774 \uc5b4\ub5bb\uac8c \uacb0\uc815\ub418\ub294\uc9c0\ub294 \ub300\ucda9 \uc5b4\ub518\uac00\uc5d0\uc11c \ub4e4\uc5b4\ubd10\uc11c \ub2e4\ub4e4 \uc54c\uace0 \uc788\uc744 \uac83\uc774\ub77c \ubbff\uace0 \ub118\uc5b4\uac04\ub2e4.<\/p>\n

\uc774\uc81c \ub0b4\uac00 \ud558\uace0\uc2f6\uc740 \uc598\uae30\ub294 $S=\\{x^n : n = $an positive integer or zero$\\}$\uac00 f(x) \uacf5\uac04\uc758 \uae30\uc800\uac00 \ub41c\ub2e4\ub294 \uac83\uc744 \uc598\uae30\ud558\uace0 \uc2f6\ub2e4. \ubb3c\ub860 f(x)\uacf5\uac04\uc774 \ubca1\ud130 \uacf5\uac04\uc784\uc740 \uc27d\uac8c \uc99d\uba85\ud560 \uc218 \uc788\ub2e4.<\/p>\n

\uc138 \ud568\uc218 f(x), g(x), h(x)\uac00 \uc788\uace0 \uc2e4\uc218 a, b\uac00 \uc788\uc744 \ub54c
\n
\n f(x)+g(x)\ub3c4 \ud568\uc218\uace0, af(x)\ub3c4 \ud568\uc218\uc774\uba70, g(x)+f(x)=f(x)+g(x)\uc774\uace0, (f+g)+h=f+(g+h)\uc774\uace0, … \ub4f1\ub4f1. \ubca1\ud130 \uacf5\uac04\uc758 10\uac00\uc9c0 \uc131\uc9c8\uc744 \ub9cc\uc871\ud55c\ub2e4\ub294 \uac83\uc740 \uc27d\uac8c \uc99d\uba85\ud574\ubcfc \uc218 \uc788\ub2e4. \uadc0\ucc2e\uc73c\ub2c8 \uc0dd\ub7b5\ud558\uc790. (\uc774 \uae00\uc740 \uc218\ud559 \uad50\uacfc\uc11c\uac00 \uc544\ub2c8\ubbc0\ub85c)<\/p>\n

\uc5b4\uca0c\ub4e0 \ubca1\ud130 \uacf5\uac04\uc5d0\uc11c \uc5b4\ub5a4 \ud2b9\uc815\ud55c \uc9d1\ud569\uc774 \uc788\uc5b4\uc11c, \uadf8 \uc9d1\ud569\uc5d0 \uc788\ub294 \uc6d0\uc18c\ub4e4\ub9cc \uc788\uc73c\uba74 \uadf8 \uc9d1\ud569\uc758 \uc6d0\uc18c\ub4e4\uc758 \uc120\ud615 \uacb0\ud569\uc73c\ub85c \uadf8 \uacf5\uac04\uc758 \ubaa8\ub4e0 \uc6d0\uc18c\ub97c \ud45c\ud604\ud560 \uc218 \uc788\ub294 \uc9d1\ud569\uc744 \uae30\uc800 \ubca1\ud130\ub77c\uace0 \ubd80\ub978\ub2e4. \uc774\uac83\uc774 \uadf8\uac83\uc774 \ub418\ub824\uba74 \ubaa8\ub4e0 \uc6d0\uc18c\ub97c \ud45c\ud604\ud560 \uc218 \uc788\uace0, \uc11c\ub85c \uc911\ubcf5\ub418\uc9c0 \uc54a\ub294\ub2e4\ub294 \uac83\uc744 \uc99d\uba85\ud574\uc57c \ud55c\ub2e4.<\/p>\n

\uc704\uc5d0\uc11c \ub9d0\ud55c S\uac00 \ubc14\ub85c \uadf8\ub7f0 \uc9d1\ud569\uc774\ub77c\ub294 \uac83\uc744 \uc99d\uba85\ud574 \ubcf4\uc790. \uc77c\ub2e8, \uc11c\ub85c \uc911\ubcf5\ub418\uc9c0 \uc54a\ub294\ub2e4\ub294 \uac83\uc740 \uc27d\uac8c \uc54c \uc218 \uc788\ub2e4.
\n
\n $x^n = x^m$
\n
\n \uc5b4\ub290 \ub450 \ud568\uc218\uac00 \uac19\uae30 \uc704\ud574\uc11c\ub294 \ubaa8\ub4e0 \uc2e4\uc218\uc5d0 \ub300\ud574\uc11c \uc774 \ub4f1\uc2dd\uc774 \uc131\ub9bd\ud574\uc57c \ud558\ub294\ub370, \uc774 \ub4f1\uc2dd\uc740 n=m\uc778 \uacbd\uc6b0\uc5d0\ub9cc \uc131\ub9bd\ud55c\ub2e4. x=0\uc774\ub77c\ub294 \ud2b9\uc815\ud55c \uacbd\uc6b0\uc5d0\ub294 \ubaa8\ub4e0 n, m\uc5d0 \ub300\ud574\uc11c \uc131\ub9bd\ud558\ub2c8\uae4c x\uac00 0\uc774 \uc544\ub2c8\ub77c \ud558\uace0, \uc591\ubcc0\uc744 $x^m$\uc73c\ub85c \ub098\ub220\ubcf4\uc790. \uadf8\ub7fc $x^{(n-m)} =1$ \uc774 \ub41c\ub2e4. \ubb3c\ub860 \uc774 \ud568\uc218\ub294 x=0\uc774\uc678\uc758 \uadfc\uc744 \uac16\uc9c0 \uc54a\uc73c\uba70, \uc774 \ub4f1\uc2dd\uc740 x=0\uc774 \uc544\ub2cc \uacbd\uc6b0\uc5d0\ub294 \uc131\ub9bd\ud558\uc9c0 \uc54a\ub294\ub2e4. \uc5b4\uca0c\ub4e0 \uc99d\uba85\ub41c\ub2e4.<\/p>\n

\ud558\uc9c0\ub9cc \uae30\uc800 \uc9d1\ud569\uc774\ub77c\ub294 \uac83\uc744 \uc99d\uba85\ud558\ub824\uba74 \uc870\uae08 \ub354 \ubcf5\uc7a1\ud55c \uacfc\uc815\uc774 \uc788\ub294\ub370, \uc11c\ub85c \uc911\ubcf5\ub418\uc9c0 \uc54a\ub294\ub2e4\ub294 \uac83 \ubfd0\ub9cc \uc544\ub2c8\ub77c \uc11c\ub85c\uac00 \uc120\ud615 \ub3c5\ub9bd\uc774\ub77c\ub294 \uac83\uc744 \ubcf4\uc5ec\uc57c \ud55c\ub2e4. \uc989, \uadf8 \uc9d1\ud569\uc758 \uc5b4\ub290 \ud55c \uc6d0\uc18c\uac00 \ub098\uba38\uc9c0 \ub2e4\ub978 \uc6d0\uc18c\ub4e4\uc758 \uc120\ud615 \uacb0\ud569\uc73c\ub85c \ud45c\ud604\ub420 \uc218 \uc5c6\ub2e4\ub294 \uac83\uc744 \ubcf4\uc5ec\uc918\uc57c \ud55c\ub2e4.
\n
\n \ubb3c\ub860 \uc27d\uac8c \uc99d\uba85\ud560 \uc218 \uc788\ub2e4.
\n
\n $x^n = a_0 + a_1 x + … + a_{n-1} x^{n-1} + a_{n+1} x^{n+1} + … $
\n
\n \uac00 \uc131\ub9bd\ud558\ub294 \uc801\ub2f9\ud55c $a_i$ \ub4e4\uc774 \uc788\ub2e4\uace0 \ud574 \ubcf4\uc790. \uc5c6\uc744\uac83 \uac19\uc9c0\ub9cc, \uc77c\ub2e8 \uadf8\ub807\ub2e4\uace0 \uce58\uc790. \uc5b4\uca0c\uac70\ub098 x=0\uc774\uc678\uc758 \ubaa8\ub4e0 \uc2e4\uc218\uc5d0\uc11c \ub2e4 \uc131\ub9bd\ud574\uc57c \ud558\ub2c8\uae4c, \uc77c\ub2e8 x=0\uc774 \uc544\ub2c8\ub77c\uace0 \ud558\uc790. \uadf8\ub7fc \ub9c8\ucc2c\uac00\uc9c0\ub85c $x^n$\uc73c\ub85c \uc591\ubcc0\uc744 \ub098\ub20c \uc218 \uc788\ub2e4. \uadf8\ub7fc \uc88c\ubcc0\uc740 1\uc774\ub77c\ub294 \uc0c1\uc218\uac00 \ub418\uace0, \uc6b0\ubcc0\uc740 \ubb54\uac00 \ubcf5\uc7a1\ud574 \ubcf4\uc774\uc9c0\ub9cc \uc5b4\uca0c\ub4e0 x\uc5d0 \ub530\ub77c\uc11c \uac12\uc774 \ubcc0\ud558\uac8c \ub41c\ub2e4. x=0\uc77c\ub54c\uc5d0\ub3c4, \uc801\ub2f9\ud788 \uacc4\uc218\ub97c \uc9dc\ub9de\ucdb0\uc11c \ubc1c\uc0b0\ud558\uc9c0 \uc54a\uac8c \ud588\ub2e4 \ud558\ub354\ub77c\ub3c4 \uc808\ub300\ub85c \uc6b0\ubcc0\uc740 \ubaa8\ub4e0 \uc2e4\uc218\uc5d0 \ub300\ud574\uc11c 1\uc774 \ub420 \uc218\uac00 \uc5c6\ub2e4.<\/p>\n

\uc5b4\uca0c\uac70\ub098 \uc120\ud615 \ub3c5\ub9bd\uc774\ub2e4.<\/p>\n

S\uac00 \uae30\uc800 \uc9d1\ud569\uc774\ub77c\ub294 \uac83\uc744 \uc99d\uba85\ud558\ub824\uba74 \ud55c\uac00\uc9c0\ub97c \ub354 \ubcf4\uc5ec\uc918\uc57c \ud558\ub294\ub370, S\uc758 \uc6d0\uc18c\ub4e4\uc758 \uc120\ud615 \uacb0\ud569\uc73c\ub85c \ubaa8\ub4e0 \ud568\uc218\ub97c \ud45c\ud604 \uac00\ub2a5\ud574\uc57c \ud55c\ub2e4\ub294 \uac83\uc774\ub2e4. \ubb3c\ub860 \uc774\uac83\uc740 \ud14c\uc77c\ub7ec \uc815\ub9ac\uac00 \ubcf4\uc99d\ud558\ub294 \ubc14\uc774\ub2e4.<\/p>\n

\uc99d\uba85 \ub05d.<\/p>\n

S\uc758 \uc6d0\uc18c\ub294 \ubb34\ud55c\ud788 \ub9ce\uc73c\ubbc0\ub85c \ud568\uc218 \uacf5\uac04\uc758 \ucc28\uc6d0\uc740 \ubb34\ud55c\ub300\uc774\ub2e4.
\n
\n \ubb50, \uad73\uc774 S\uc758 \ub18d\ub3c4\ub97c \ubb3b\ub294\ub2e4\uba74 \ub2f9\uc5f0\ud788 \uc790\uc5f0\uc218\uc640 \uac19\ub2e4.<\/p>\n

(\uc751?!)
\n <\/p>\n

\n
\n
\n\"\uc2e0\uace0\"
\n<\/a>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

\ub204\uac00 \ubc29\uba85\ub85d\uc5d0 \ubb3c\uc5b4\ubd10\uc11c… \uc2e4\uc218 \ud568\uc218 \uacf5\uac04\uc758 \ucc28\uc6d0\uc740 \ubb34\ud55c\ub300\uc774\ub2e4. \uac04\ub2e8\ud788 \uc99d\uba85\ud574 \ubcf4\uc790. \uc77c\ub2e8 \uc5b4\ub514\uc11c \ubb58 \uac16\uace0 \ub180\uc9c0 \uc815\ud574\uc57c \ud558\ub294\ub370, \uc2e4\uc218 \uc804\uccb4 \uad6c\uac04\uc5d0\uc11c \uc2e4\uc218\ub85c \uac00\ub294 \ud568\uc218 f(x)\ub4e4 \uc911 \ubb34\ud55c\ubc88 \ubbf8\ubd84 \uac00\ub2a5\ud558\uace0 f(x)\uc758 \uc808\ub300\uac12\uc758 \uc81c\uacf1\uc744 \uc2e4\uc218 \uc804\uccb4\ub97c \ub300\uc0c1\uc73c\ub85c \ud558\uc5ec \uc801\ubd84\ud558\ub354\ub77c\ub3c4 \uadf8 \uc801\ubd84\uac12\uc774 \ubb34\ud55c\ub300\ub85c \ubc1c\uc0b0\ud558\uc9c0 \uc54a\ub294, \uc989, \uc5b4\ub5a4 \ud2b9\uc815\ud55c \uc2e4\uc218\ub85c \uc218\ub834\ud558\ub294 \uadf8\ub7f0 \ud568\uc218\ub4e4\ub9cc\uc744 \ub300\uc0c1\uc73c\ub85c \ud558\uc790. \uc0ac\uc2e4\uc740 \uadf8\ub0e5 \ubbf8\ubd84\ub9cc \uc798 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-8771","post","type-post","status-publish","format-standard","hentry","category-academic"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8o6gA-2ht","jetpack-related-posts":[],"jetpack_likes_enabled":true,"_links":{"self":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts\/8771","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=8771"}],"version-history":[{"count":0,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts\/8771\/revisions"}],"wp:attachment":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8771"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8771"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8771"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}