{"id":9259,"date":"2010-10-02T13:30:00","date_gmt":"2010-10-02T13:30:00","guid":{"rendered":"http:\/\/melotopia.net\/b\/?p=9259"},"modified":"2010-10-02T13:30:00","modified_gmt":"2010-10-02T13:30:00","slug":"%ed%95%a8%ec%88%98-2-2","status":"publish","type":"post","link":"http:\/\/melotopia.net\/b\/?p=9259","title":{"rendered":"\ud568\uc218? 2"},"content":{"rendered":"<div class=\"desc\">\n        \ubca1\ud130\ub97c \ucc98\uc74c \ubc30\uc6b8 \ub54c, \ud654\uc0b4\ud45c\ub97c \uac16\uace0 \ubc30\uc6b4\ub2e4. \uadf8\ub9ac\uace0 \uac00\uc7a5 \uc27d\uac8c \uadf8\ub9b4 \uc218 \uc788\ub294 2\ucc28\uc6d0 \ud3c9\uba74 \uc704\uc5d0 \uc788\ub294 \ud654\uc0b4\ud45c\ub97c \uac16\uace0 \ubc30\uc6b4\ub2e4. 2\ucc28\uc6d0 \ud654\uc0b4\ud45c\ub294 2\uac1c\uc758 \uc218\ub85c \ud45c\ud604\ud560 \uc218 \uc788\ub2e4. (x, y) \ucc98\ub7fc. \ub9cc\uc57d 2\uac1c\uc758 \ud654\uc0b4\ud45c\uac00 \uc788\ub2e4\uba74 \ub354\ud560 \uc218 \uc788\ub2e4. (x, y) + (w, z) = (x+w, y+z) \ucc98\ub7fc. \uc774\uac83\uc740 \uc2e4\uc218(\ub610\ub294 \ubcf5\uc18c\uc218)\uc5d0\uc11c\ub9cc \uc815\uc758\ub41c +\ub77c\ub294 \uc5f0\uc0b0\uc758 \uc815\uc758\ub97c \ubca1\ud130\uc5d0 \ub300\ud574\uc11c \ud655\uc7a5\ud55c \uacbd\uc6b0\uc774\ub2e4. \uc774\uac78 \ub2e4\uc2dc \uc784\uc758\uc758 n\ucc28\uc6d0\uc5d0 \ub300\ud55c \ubca1\ud130\ub85c \ud655\uc7a5\ud558\uace0, n\uc774 \ubb34\ud55c\ub300\ub85c \uac08 \uacbd\uc6b0\uc5d0 \ub300\ud574 \uc0dd\uac01\ud55c\ub2e4. \uadf8\ub7fc \ubca1\ud130\uc758 \uac01 \uc131\ubd84\uc740 \uc5b4\ub5a4 \uc218\uc5f4\uc774 \ub420 \uac83\uc774\ub2e4. \uc218\uc5f4\uc758 \ucca8\uc790 n\uc744, \uc9c0\ub09c\ubc88\uc5d0 \ub9d0\ud588\ub4ef\uc774 \uc5f0\uc18d\uc131\uc744 \uac16\ub3c4\ub85d \uc0c8\ub86d\uac8c \uc815\uc758\ud558\uba74, \uc774\uc81c f(x)\ub77c \ubd80\ub974\ub294 \ud568\uc218\uac00 \uc0ac\uc2e4\uc740 \uc6b0\ub9ac\uac00 \uc798 \uc54c\ub358 \ud654\uc0b4\ud45c\uc758 \ud55c \ud615\ud0dc\ub77c\ub294 \uc0ac\uc2e4\uc744 \uc54c\uac8c \ub41c\ub2e4.<br \/>\n        <sup class=\"footnote\"><br \/>\n<a href=\"#footnote_2088_1\" id=\"footnote_link_2088_1\" onmouseout=\"tistoryFootnote.hide(2088,1)\" onmouseover=\"tistoryFootnote.show(this,2088,1)\" style=\"color:#f9650d;font-family:Verdana,Sans-serif\"><br \/>\n<span style=\"display:none\"><br \/>\n           [\uac01\uc8fc:<br \/>\n          <\/span><br \/>\n          1<br \/>\n          <span style=\"display:none\"><br \/>\n           ]<br \/>\n          <\/span><br \/>\n<\/a><br \/>\n<\/sup><\/p>\n<p>        \uadf8\ub7fc, \ud558\ub098\uc758 \ud654\uc0b4\ud45c\uc5d0 \ud558\ub098\uc758 \uc218\ub97c \ub300\uc751\uc2dc\ud0a4\ub294 \uaddc\uce59\uc774 \uc788\ub2e4\uba74, \uadf8\uac83 \ub610\ud55c \ud568\uc218\uc774\ub2e4. \uadf8\ub9ac\uace0 \uadf8\uac78 Functional\uc774\ub77c\uace0 \ubd80\ub978\ub2e4.<\/p>\n<p>        \uac00\uc7a5 \uc27d\uac8c \uc0dd\uac01\ud560 \uc218 \uc788\ub294 \uc608\uc81c\ub85c\ub294 \uc0ac\uc601(Projection)\uc774 \uc788\ub2e4. \uc774\uac74 \uc5b4\ub5a4 \ubca1\ud130A\uc758 k\ubc88\uc9f8 \uc131\ubd84\uc744 \uc120\ud0dd\ud558\ub294 \ud568\uc218\uc774\ub2e4. \uc784\uc758\uc758 \ubca1\ud130 A\uc5d0 \ub300\ud574\uc11c, f(A) = Ak\ub77c\uace0 \uc815\uc758\ud558\uba74 \ub41c\ub2e4. \ub9cc\uc57d \ubca1\ud130A\uac00 \uc218\uc5f4\uc774 \uc544\ub2c8\ub77c \uc5f0\uc18d\uc801\uc778 \ubcc0\uc218\ub97c \uac16\ub294 \ud568\uc218F\ub85c \uc8fc\uc5b4\uc838 \uc788\ub2e4\uba74 k\ub300\uc2e0\uc5d0 \ud2b9\uc815\ud55c \ubcc0\uc218 a\ub97c \uc368\uc11c f(F) = F(a)\ub77c\uace0 \uc815\uc758\ud558\uba74 \ub41c\ub2e4.<\/p>\n<p>        \ub610 \ub2e4\ub978 \uc608\uc81c\ub85c\ub294 \ub0b4\uc801(Inner product)\uc774 \uc788\ub2e4. \uc774\uac83\uc740 \ud2b9\uc815\ud55c \ubca1\ud130 \ud558\ub098\ub97c \uc815\ud574\ub193\uace0, \uadf8 \ubca1\ud130\uc640 \ub0b4\uc801\ud55c \uac12\uc744 \ud568\uc218\uac12\uc73c\ub85c \uc120\ud0dd\ud55c\ub2e4. \uac00\ub839, V\uac00 \uc815\ud574\uc838 \uc788\ub2e4\uace0 \ud558\uba74 f(A) = V$\\cdot$A \ub77c\uace0 \uc815\uc758\ud55c\ub2e4. \ubca1\ud130\uac00 \uc218\uc5f4\uc774 \uc544\ub2c8\ub77c \uc5f0\uc18d \ud568\uc218\ub85c \uc8fc\uc5b4\uc9c0\ub294 \uacbd\uc6b0\uc5d0\ub294 \ub367\uc148\uc774 \uc544\ub2c8\ub77c \uc801\ubd84\uc73c\ub85c \uadf8 \uac12\uc744 \uacc4\uc0b0\ud574\uc57c \ud558\uc9c0\ub9cc, \uacc4\uc0b0\uc774 \ubcf5\uc7a1\ud574\uc9c8 \ubfd0 \uadf8 \ubcf8\uc9c8\uc801\uc778 \uce21\uba74\uc5d0 \uc788\uc5b4\uc11c\ub294 \uc804\ud600 \ubcc0\ud558\uc9c0 \uc54a\ub294\ub2e4.<\/p>\n<p>        \uac00\uc7a5 \uc720\uba85\ud55c Functional\uc740, \uc774 \ube14\ub85c\uadf8\uc5d0\uc11c\ub3c4 \uc5ec\ub7ec\ubc88 \uc598\uae30\ud588\ub358 \uc801\uc774 \uc788\ub294 \ub77c\uadf8\ub791\uc9c0\uc548(Lagrangian)\uc774\ub2e4. \ub77c\uadf8\ub791\uc9c0\uc548\uc740 \uc704\uce58\uc640 \uc704\uce58\uc758 \ub3c4\ud568\uc218\uc5d0 \ub300\ud55c \ubc94\ud568\uc218\uc774\ub2e4. \uadf8\ub9ac\uace0 \uc704\uce58\ub294 \uc2dc\uac04\uc5d0 \ub300\ud55c \ud568\uc218\uc774\ub2e4.<br \/>\n        <sup class=\"footnote\"><br \/>\n<a href=\"#footnote_2088_2\" id=\"footnote_link_2088_2\" onmouseout=\"tistoryFootnote.hide(2088,2)\" onmouseover=\"tistoryFootnote.show(this,2088,2)\" style=\"color:#f9650d;font-family:Verdana,Sans-serif\"><br \/>\n<span style=\"display:none\"><br \/>\n           [\uac01\uc8fc:<br \/>\n          <\/span><br \/>\n          2<br \/>\n          <span style=\"display:none\"><br \/>\n           ]<br \/>\n          <\/span><br \/>\n<\/a><br \/>\n<\/sup><\/p>\n<p>        \uc774\uc81c \ubc94\ud568\uc218\uc758 \ubbf8\ubd84\uc5d0 \ub300\ud574\uc11c \uc0dd\uac01\ud574 \ubcf4\uc790. \uc0ac\uc2e4 \ubc94\ud568\uc218\uc758 \ubbf8\ubd84\uc740 \ud3b8\ubbf8\ubd84\uc758 \uc77c\ubc18\ud654\ub41c \ud615\ud0dc\uc774\ub2e4. \ubbf8\ubd84\uc744 \ucc98\uc74c \ubc30\uc6b8 \ub54c, f(x)\uc5d0 \ub300\ud574\uc11c f(x+D)\uac00 f(x)\uc640 \uc5bc\ub9c8\ub098 \ucc28\uc774\uac00 \ub0a0 \uc9c0 \uc0dd\uac01\ud574\uc11c, df\/dx = (f(x+D)-f(x))\/D\ub85c  \uc815\ud574\ub193\uace0 D\ub97c 0\uc73c\ub85c \ubcf4\ub0b4\ub294 \uadf9\ud55c\uc744 \ucde8\ud574\uc11c \uacc4\uc0b0\ud55c\ub2e4\uace0 \ubc30\uc6e0\ub2e4. \ud3b8\ubbf8\ubd84\uc740 x\uac00 \ud558\ub098\uc758 \uc218\uac00 \uc544\ub2c8\ub77c \ubca1\ud130\ub85c \uc8fc\uc5b4\uc838 \uc788\uc744 \ub54c, \uadf8 \ubca1\ud130\uc911\uc5d0\uc11c \ub2e4\ub978 \uc131\ubd84\uc740 \ub2e4 \uace0\uc815\ub418\uc5b4 \uc788\uace0 \uc5b4\ub5a4 k\ubc88\uc9f8 \uc131\ubd84\uc5d0 \ub300\ud55c \ud568\uc218\ub77c\uace0 \uc0dd\uac01\ud558\uace0 \ubbf8\ubd84\uc744 \uacc4\uc0b0\ud55c\ub2e4. \uadf8\ub7fc k\uac00 1\ubd80\ud130 n\uae4c\uc9c0 \ub2e4 \ub4f1\uc7a5\ud558\ubbc0\ub85c, \ud3b8\ubbf8\ubd84\ud55c \ud568\uc218\ub4e4\uc744 \ub2e4 \uae01\uc5b4\ubaa8\uc73c\uba74 \ud558\ub098\uc758 \ubca1\ud130\uac00 \ub4f1\uc7a5\ud55c\ub2e4. \uc5ec\uae30\uc5d0 \ub2e4\uc2dc \uc5b4\ub5a4 \ubc29\ud5a5\uc73c\ub85c \uc6c0\uc9c1\uc774\ub294\uc9c0\uc5d0 \ub300\ud55c \uc815\ubcf4\ub97c \uc54c\ub824 \uc8fc\uba74, \uadf8 \ubc29\ud5a5\uc73c\ub85c \ud5a5\ud560 \ub54c\uc758 \ub3c4\ud568\uc218\ub97c \uad6c\ud558\uac8c \ub41c\ub2e4.<\/p>\n<p>        \ubc94\ud568\uc218\uc758 \ubbf8\ubd84\uc740 \ud3b8\ubbf8\ubd84\uc758 \ucca8\uc790\ub97c \uc5f0\uc18d\uc801\uc73c\ub85c \uc77c\ubc18\ud654 \uc2dc\ud0a8 \ud615\ud0dc\uc774\ub2e4.<br \/>\n        <\/p>\n<div class=\"footnotes\">\n<ol class=\"footnotes\">\n<li id=\"footnote_2088_1\">\n           \uadf8\ub9ac\uace0 \uadf8\uac8c \uc0ac\uc2e4\uc774\uac74 \uc544\ub2c8\uac74 \uc0c1\uad00 \uc5c6\ub2e4\ub294 \uac83\ub3c4 \uc0ac\uc2e4\uc774\ub2e4. \ub9d8\uc5d0 \uc548\ub4e4\uba74 \uadf8\ub0e5 \uadf8\ub807\uac8c \uc815\uc758\ud588\ub2e4\uace0 \uce58\uba74 \ub418\ub2c8\uae4c. \ub2e4\ub974\uac8c \uc815\uc758\ud574\ub3c4 \uc0c1\uad00 \uc5c6\ub2e4. \ub2e8, \ub2e4\ub978 \uc218\ud559\uc790\ub4e4\uc774\ub791 \uc598\uae30\ud560 \ub54c \uc5b4\ub5bb\uac8c \uc815\uc758\ud588\ub294\uc9c0 \ud56d\uc0c1 \uc798~ \uc124\uba85\ud574\uc57c \ub35c \uace8\uce58\uc544\ud50c \uac83\uc774\ub2e4.<br \/>\n           <a href=\"#footnote_link_2088_1\"><br \/>\n            [\ubcf8\ubb38\uc73c\ub85c]<br \/>\n           <\/a>\n<\/li>\n<li id=\"footnote_2088_2\">\n           \ubb3c\ub860 \ub77c\uadf8\ub791\uc9c0\uc548\uc740 \uc120\ud615 \ubc94\ud568\uc218\uac00 \uc544\ub2c8\ub2e4.<br \/>\n           <a href=\"#footnote_link_2088_2\"><br \/>\n            [\ubcf8\ubb38\uc73c\ub85c]<br \/>\n           <\/a>\n<\/li>\n<\/ol>\n<\/div>\n<p><script type=\"text\/javascript\">\n         tistoryFootnote.add(2088,1,\"\\uadf8\\ub9ac\\uace0 \\uadf8\\uac8c \\uc0ac\\uc2e4\\uc774\\uac74 \\uc544\\ub2c8\\uac74 \\uc0c1\\uad00 \\uc5c6\\ub2e4\\ub294 \\uac83\\ub3c4 \\uc0ac\\uc2e4\\uc774\\ub2e4. \\ub9d8\\uc5d0 \\uc548\\ub4e4\\uba74 \\uadf8\\ub0e5 \\uadf8\\ub807\\uac8c \\uc815\\uc758\\ud588\\ub2e4\\uace0 \\uce58\\uba74 \\ub418\\ub2c8\\uae4c. \\ub2e4\\ub974\\uac8c \\uc815\\uc758\\ud574\\ub3c4 \\uc0c1\\uad00 \\uc5c6\\ub2e4. \\ub2e8, \\ub2e4\\ub978 \\uc218\\ud559\\uc790\\ub4e4\\uc774\\ub791 \\uc598\\uae30\\ud560 \\ub54c \\uc5b4\\ub5bb\\uac8c \\uc815\\uc758\\ud588\\ub294\\uc9c0 \\ud56d\\uc0c1 \\uc798~ \\uc124\\uba85\\ud574\\uc57c \\ub35c \\uace8\\uce58\\uc544\\ud50c \\uac83\\uc774\\ub2e4.\");\ntistoryFootnote.add(2088,2,\"\\ubb3c\\ub860 \\ub77c\\uadf8\\ub791\\uc9c0\\uc548\\uc740 \\uc120\\ud615 \\ubc94\\ud568\\uc218\\uac00 \\uc544\\ub2c8\\ub2e4.\");\n        <\/script><\/p>\n<div style=\"width:100%;margin-top:30px;clear:both;height:30px\">\n<div style=\"width:31px;float:left;\">\n<a href=\"\/toolbar\/popup\/abuseReport\/?entryId=2088\" onclick=\"window.open(this.href, 'tistoryThisBlogPopup', 'width=550, height=510, toolbar=no, menubar=no, status=no, scrollbars=no'); return false;\"><br \/>\n<img data-recalc-dims=\"1\" decoding=\"async\" alt=\"\uc2e0\uace0\" src=\"https:\/\/i0.wp.com\/t1.daumcdn.net\/tistory_admin\/static\/ico\/ico_spam_report.png\" style=\"border:0\"\/><br \/>\n<\/a>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\ubca1\ud130\ub97c \ucc98\uc74c \ubc30\uc6b8 \ub54c, \ud654\uc0b4\ud45c\ub97c \uac16\uace0 \ubc30\uc6b4\ub2e4. \uadf8\ub9ac\uace0 \uac00\uc7a5 \uc27d\uac8c \uadf8\ub9b4 \uc218 \uc788\ub294 2\ucc28\uc6d0 \ud3c9\uba74 \uc704\uc5d0 \uc788\ub294 \ud654\uc0b4\ud45c\ub97c \uac16\uace0 \ubc30\uc6b4\ub2e4. 2\ucc28\uc6d0 \ud654\uc0b4\ud45c\ub294 2\uac1c\uc758 \uc218\ub85c \ud45c\ud604\ud560 \uc218 \uc788\ub2e4. (x, y) \ucc98\ub7fc. \ub9cc\uc57d 2\uac1c\uc758 \ud654\uc0b4\ud45c\uac00 \uc788\ub2e4\uba74 \ub354\ud560 \uc218 \uc788\ub2e4. (x, y) + (w, z) = (x+w, y+z) \ucc98\ub7fc. \uc774\uac83\uc740 \uc2e4\uc218(\ub610\ub294 \ubcf5\uc18c\uc218)\uc5d0\uc11c\ub9cc \uc815\uc758\ub41c +\ub77c\ub294 \uc5f0\uc0b0\uc758 \uc815\uc758\ub97c \ubca1\ud130\uc5d0 \ub300\ud574\uc11c [&hellip;]<\/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-9259","post","type-post","status-publish","format-standard","hentry","category-academic"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8o6gA-2pl","jetpack-related-posts":[],"jetpack_likes_enabled":true,"_links":{"self":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts\/9259","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=9259"}],"version-history":[{"count":0,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts\/9259\/revisions"}],"wp:attachment":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=9259"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=9259"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=9259"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}