
{"id":3356,"date":"2008-12-18T15:30:00","date_gmt":"2008-12-18T06:30:00","guid":{"rendered":"https:\/\/mathematicians.korea.ac.kr\/ywkim\/?p=3356"},"modified":"2021-09-02T16:16:30","modified_gmt":"2021-09-02T07:16:30","slug":"%eb%af%b8%eb%b6%84%ea%b8%b0%ed%95%98%ed%95%99ii-2k8-%ea%b0%80%ec%9d%84-%ed%95%99%ea%b8%b0","status":"publish","type":"post","link":"https:\/\/mathematicians.korea.ac.kr\/ywkim\/2008\/12\/18\/%eb%af%b8%eb%b6%84%ea%b8%b0%ed%95%98%ed%95%99ii-2k8-%ea%b0%80%ec%9d%84-%ed%95%99%ea%b8%b0\/","title":{"rendered":"\ubbf8\ubd84\uae30\ud558\ud559II 2K8 \uac00\uc744 \ud559\uae30"},"content":{"rendered":"<p> (TableOfContents) <\/p>\n<div id=\"outline-container-org691456c\" class=\"outline-2\">\n<h2 id=\"org691456c\">\uac15\uc758 \uc9c4\ub3c4<\/h2>\n<div class=\"outline-text-2\" id=\"text-org691456c\">\n<ul class=\"org-ul\">\n<li>(11\/26)<\/li>\n<li>(11\/24)<\/li>\n<li>(11\/19)<\/li>\n<li>(11\/17)<\/li>\n<li>(11\/12)<\/li>\n<li>(11\/10)<\/li>\n<li>(11\/5)<\/li>\n<li>(11\/3)<\/li>\n<li>(10\/29)<\/li>\n<li>(10\/27)<\/li>\n<li>(10\/22)<\/li>\n<li>(10\/20) \uc911\uac04\uc2dc\ud5d8<\/li>\n<li>(10\/15) \ud734\uac15<\/li>\n<li>(10\/13) \uce21\uc9c0\uace1\ub960<\/li>\n<li>(10\/8) geodesic\uc758 \ubc29\uc815\uc2dd<\/li>\n<li>(10\/6) \ud68c\uc804\uba74\uc758 geodesic<\/li>\n<li>(10\/1) geodesic\uc758 \ubc29\uc815\uc2dd<\/li>\n<li>(9\/29) Codazzi-Mainardi\ubc29\uc815\uc2dd\uacfc \uace1\uba74\ub860\uc758 \uae30\ubcf8\uc815\ub9ac<\/li>\n<li>(9\/24) \uac00\uc6b0\uc2a4\uc758 \ub180\ub77c\uc6b4 \uc815\ub9ac<\/li>\n<li>(9\/22) \uacc4\ub7c9\uae30\uc758 \uacc4\uc0b0: \uad6c\uba74<\/li>\n<li>(9\/17) \uacc4\ub7c9\uae30\uc758 \uacc4\uc0b0: \ud3c9\uba74\uacfc \uc6d0\uae30\ub465, \uc6d0\ubfd4 \ub4f1<\/li>\n<li>(9\/10) \uacc4\ub7c9\uae30\uc758 \uc815\uc758<\/li>\n<li>(9\/8) \ud574\uc11d\ud559 review: \ubbf8\ubd84\ud615\uc2dd\uc774\ub780?<\/li>\n<li>(9\/3) \uc120\ud615\ub300\uc218 review<\/li>\n<li>(9\/1) \uc624\ub9ac\uc5d4\ud14c\uc774\uc158<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div id=\"outline-container-orgb754559\" class=\"outline-2\">\n<h2 id=\"orgb754559\">\uacf5\uc9c0<\/h2>\n<div class=\"outline-text-2\" id=\"text-orgb754559\">\n<ol class=\"org-ol\">\n<li>\ud559\uae30\ub9d0\uc2dc\ud5d8\uc740 12\uc6d4 17\uc77c \uc218\uc694\uc77c \uac15\uc758\uc2dc\uac04\uc5d0 \uc804\uc0b0\uc2e4\uc5d0\uc11c \uce58\ub985\ub2c8\ub2e4. 1\uc2dc\uac04 30\ubd84 \uc2dc\ud5d8\uc785\ub2c8\ub2e4.<\/li>\n<li>\uc911\uac04\uc2dc\ud5d8\uc740 10\uc6d4 20\uc77c \uc6d4\uc694\uc77c \uac15\uc758\uc2dc\uac04\uc5d0 \uc804\uc0b0\uc2e4\uc5d0\uc11c \uce58\ub985\ub2c8\ub2e4. 1\uc2dc\uac04 30\ubd84 \uc2dc\ud5d8\uc785\ub2c8\ub2e4.<\/li>\n<li>\uc9c0\ub09c\ubc88 \ub3c4\uc6b0\ubbf8\uc870\uad50\ub97c \uc6d0\ud55c\ub2e4\uace0 \ud559\uc0dd\uc740 \ub2e4\uc74c\uc5d0 \uac8c\uc2dc\ub420 \uc77c\uc815\uc5d0 \uc870\uad50\uc640 \ub9cc\ub098\uae30 \ubc14\ub798\uc694. \uac70\uae30\uc11c \uc870\uad50\uc120\uc0dd\ub2d8\uc744 \ubc30\uc815\ud558\uace0 \uc870\uad50\uc120\uc0dd\ub2d8\uacfc \uc2dc\uac04\uc744 \uc815\ud560 \uac83\uc785\ub2c8\ub2e4.\n<ul class=\"org-ul\">\n<li>\uccab \ub9cc\ub0a8: \ub2e4\uc74c \uc8fc \uc6d4\uc694\uc77c(10\/6) \uac15\uc758\uc2dc\uac04 \uc9c1\ud6c4 \uc6b0\ub9ac \uac15\uc758\uc2e4(\uc218\ud559\uacfc \uc804\uc0b0\uc2e4)\uc5d0\uc11c<\/li>\n<\/ul>\n<\/li>\n<li>lec note: <a href=\"https:\/\/mathematicians.korea.ac.kr\/ywkim\/wp-content\/uploads\/sites\/8\/attachments\/DiffGeometry2k8Fall\/dg2k7_ln_01_rev_la.pdf\">dg2k7_ln_01_rev_la.pdf<\/a> <a href=\"https:\/\/mathematicians.korea.ac.kr\/ywkim\/wp-content\/uploads\/sites\/8\/attachments\/DiffGeometry2k8Fall\/dg2k7_ln_02_rev_ana.pdf\">dg2k7_ln_02_rev_ana.pdf<\/a><\/li>\n<li>\uc774\ubbf8 \uacf5\uc9c0\ub418\uc5b4 \uc788\ub294\ub300\ub85c \uac15\uc758\ub294 \uc218\ud559\uacfc \uc804\uc0b0\uc2e4\uc5d0\uc11c \uc774\ub8e8\uc5b4\uc9d1\ub2c8\ub2e4. \uac15\uc758 \uad50\uc7ac\ub294 \uc591\uc131\ub355\uad50\uc218\ub2d8\uc758 \uac15\uc758\ub85d 2\ud559\uae30\ubd84\uc744 \uc0ac\uc6a9\ud558\ub294\ub370 \uc870\ub9cc\uac04\uc5d0 \ubcf5\uc0ac\ud560 \uc218 \uc788\uc744 \uac83\uc785\ub2c8\ub2e4.<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<div id=\"outline-container-org0816829\" class=\"outline-2\">\n<h2 id=\"org0816829\">\uc9c8\ubb38\ud558\uc138\uc694 Q&amp;A<\/h2>\n<div class=\"outline-text-2\" id=\"text-org0816829\">\n<p> Q: \uc9c8\ubb38 <\/p>\n<p> \uc548\ub155 \ud558\uc138\uc694 \ubbf8\ubd84\uae30\ud558 \uc218\uac15\ud559\uc0dd\uc785\ub2c8\ub2e4^^ \uacf5\ubd80\ud558\ub358 \uc911 \uc9c8\ubb38\uc774 \uc788\uc5b4\uc11c \uc5ec\ucb48\uc5b4 \ubcfc\uae4c \ud569\ub2c8\ub2e4. \uac00\uc6b0\uc2a4\uc758 \uc704\ub300\ud55c \uc815\ub9ac\uc5d0\uc11c <\/p>\n<p> \uad50\uc7ac 131\ucabd\uc5d0 6.9\uc758 \uc2dd\uc744 \ubcf4\uba74 <\/p>\n<p> X121\uc758 X2\uacc4\uc218\ub4e4\ub9cc \ucc3e\ub294 \uacfc\uc815\uc778\ub370 <\/p>\n<p> \ub9e8\ub9c8\uc9c0\ub9c9\uc5d0 fa21\uc774\ub77c \ub418\uc5b4 \uc788\ub294\ub370 \uad50\uc218\ub2d8 \uacc4\uc0b0 \ud574\uc8fc\uc168\uc744 \ub54c\ub3c4 \uadf8\ub807\uace0 a12\uac00 \ub098\uc624\ub354\ub77c\uad6c\uc694.. \uc65c\ub0d0\ud558\uba74  129\ucabd \ub9e8 \uc704\uc5d0 N1 \uad6c\ud558\ub294 \uacfc\uc815\uc5d0\uc11c\ub3c4 X2\uc758 \uacc4\uc218\ub294 a12\uac00 \ub9de\ub294\ub370 \uc65c \ucc45\uc5d4 a21\uc774\ub77c \ub418\uc5b4 \uc788\uace0 \ub610 \uc774\ub807\uac8c \ub418\uc5b4\uc57c \uac00\uc6b0\uc2a4 \uace1\ub960\ub85c \uc815\ud655\ud788 \ub098\uc624\ub098\uc694?.. \uacc4\uc0b0\uacfc\uc815\uc5d0\uc11c \ubb34\uc5c7\uc774 \ubb38\uc81c \uc778\uc9c0 \uc798 \ubaa8\ub974\uaca0\uc2b5\ub2c8\ub2e4&#x2026; <\/p>\n<p> \ub2f5\ubcc0\uc880 \ubd80\ud0c1 \ub4dc\ub9b4\uac8c\uc694.. <\/p>\n<p> \uac10\uc0ac\ud569\ub2c8\ub2e4. <\/p>\n<p> A: <\/p>\n<p> \\[ \\begin{equation} \\begin{pmatrix} a_{11} &amp; a_{12} \\\\ a_{21} &amp; a_{22}  \\end{pmatrix}= \\begin{pmatrix} e &amp; f \\\\ f &amp; g \\end{pmatrix} \\times \\begin{pmatrix} E &amp; F \\\\ F &amp; G \\end{pmatrix}^{-1} \\end{equation} \\] <\/p>\n<p>  \uad50\uacfc\uc11c\uc758 \\[ a_{21} \\] \uc744 \\[ a_{12} \\] \ub85c \ubc14\uafb8\uace0 \uc704 \uc2dd (1)\uc5d0 \ub123\uc5b4\uc11c \ub2e4\uc2dc \uacc4\uc0b0\ud574 \ubcf4\uc138\uc694. \uadf8\ub7ec\uba74 \uacb0\uacfc\ub294 \ub9de\uac8c \ub098\uc635\ub2c8\ub2e4.  donsen 18OCT08 <\/p>\n<hr \/>\n<p> \uc544 \ub2f5\ubcc0 \uac10\uc0ac\ub4dc\ub9bd\ub2c8\ub2e4. \ub2e4\ub978 \uba87\uac00\uc9c0 \uc9c8\ubb38 \uc880 \ub4dc\ub9ac\uace0\uc790 \ud569\ub2c8\ub2e4. <\/p>\n<p> Q1.\ucf54\ub2e4\uc9c0-\uba54\ub098\ub514 \uc2dd \uc720\ub3c4\uacfc\uc815\uc744 \uc880 \uc5ec\ucb64\ubcf4\uace0\uc790 \ud569\ub2c8\ub2e4. <\/p>\n<p> Nu = (a11)Xu+(a12)Xv Nv = (a21)Xu+(a22)Xv \ub85c \ub193\uace0(\uc544\uc9c1a\uac12\ub4e4\uc740 \ub300\uc785 \uc548\ud558\uace0) \uc0c1\ud0dc\uc5d0\uc11c \uba3c\uc800 \uc704\uc758\uc2dd\uc740v\uc5d0 \ub300\ud574, \uc544\ub798 \uc2dd\uc740 u\uc5d0 \ub300\ud574 \uac01\uac01 \ubbf8\ubd84\ud558\uace0 a\uac12\ub4e4\uc744 \ub300\uc785\ud558\ub824 \ud558\ub294\ub370 a\ub97c u\ub098 v\ub85c \ubbf8\ubd84\ud558\ub294 \uacfc\uc815\uc5d0\uc11c \uc2dd\uc774 \ub9e4\uc6b0 \uae38\uac8c \ub298\uc5b4\uc9c0\ub294\ub370 \uc81c\ub300\ub85c \ud55c \uac83\uc778\uc9c0 \uc798 \ubaa8\ub974\uaca0\uc2b5\ub2c8\ub2e4..\ubcf8\ub798 \uc774\ub807\uac8c \ubcf5\uc7a1\ud55c \uacfc\uc815\uc744 \uac70\uccd0\uc57c \ud558\ub294\uc9c0, \uc544\ub2c8\uba74 \uc81c\uac00 \uc798\ubabb\uc54c\uace0 \uc788\ub294\uac83\uc778\uc9c0.. \uc720\ub3c4\ud558\ub294 \uae30\ubcf8 \uc694\ub839\uc744 \uc880 \uc54c\ub824 \uc8fc\uc2dc\uba74 \uac10\uc0ac\ud558\uaca0\uc2b5\ub2c8\ub2e4. <\/p>\n<p> A: \uc5f0\uc2b5\uc2dc\uac04\uc5d0 \ub2e4\ub8ec \ub0b4\uc6a9\uc785\ub2c8\ub2e4.  \uc5f0\ub77d\uc8fc\uc138\uc694.  donsen 190CT08 <\/p>\n<p> Q2)\uad50\uc7ac 137\ucabd \uc704\uc5d0\uc11c \ub450\ubc88\uc9f8 \uc2dd\uc744 \ubcf4\uba74 g*ds(ui)*uj=g*ui*ds(uj)\ub77c \ub098\uc640 \uc788\ub294\ub370     gij=gji\uac00 \uadf8 \uc774\uc720\ub77c \uc368 \uc788\uc2b5\ub2c8\ub2e4. \uadf8\ub7f0\ub370 \uadf8\ub807\ub2e4 \ud574\ub3c4 \uc6b0\uc120     ds(ui)\uc640 ds(uj)\ub294 \ub2e4\ub978 \uac12\uc774\uc9c0 \uc54a\ub098\uc694? \ub2e8\uc9c0 (g*ds(ui)*uj)+(g*ui*ds(uj))\ub97c     2(g*ui*ds(uj))\ub77c \uc4f8 \uc218 \uc788\ub294 \uc774\uc720\ub294 i,j\uac12\uc774 \uc784\uc758\ub85c \ubcc0\ud560 \ub54c     (gij*ds(ui)*uj)\uc640 (gji*ds(ui)*uj)\ub450 \ud56d\uc774 \ub098\uc624\ub294\ub370 \uadf8 \ub54c gij=gji\ub2c8\uae4c \ub458\uc744 \uac19\uac8c \ubcf4\uc544     \uc2dd\uc744 \uc7ac \uc870\ud569\ud558\uc5ec 137\ucabd \uc704\uc5d0\uc11c \uc14b\uc9f8 \uc904 \ucc98\ub7fc \uc4f8 \uc218 \uc788\ub294\uac83 \uc544\ub2cc\uac00\uc694?     (\uc815\ub9ac\ud574\uc11c.. 137\ucabd \ub450\ubc88\uc9f8 \uc904 \uc2dd\uc740 \ub9de\uc9c0 \uc54a\uc9c0\ub9cc i,j\uac00 \ubcc0\ud568\uc5d0 \ub530\ub77c \ub098\uc624\ub294 \ud56d\ub4e4\uc758 \ud569\uc5d0\uc11c     \uba87\uac1c \uc6d0\uc18c \uc704\uce58\ub97c \uc7ac\ubc30\ucc44 \ud574\uc8fc\uba74 3\uc9f8 \uc904 \ucc98\ub7fc \uc4f8 \uc218 \uc788\ub294\uac8c \uc544\ub2cc\uac00 \ud558\ub294\uac8c \uc800\uc758 \uc0dd\uac01\uc785\ub2c8\ub2e4.) <\/p>\n<p> A: \uc5f0\uc2b5\uc2dc\uac04\uc5d0 \ub2e4\ub8ec \ub0b4\uc6a9\uc785\ub2c8\ub2e4.  \uc5f0\ub77d\uc8fc\uc138\uc694.  donsen 190CT08 <\/p>\n<p> Q3)\ud3c9\uade0\uace1\ub960H\uac00 \ub0b4\uc7ac\uc801 \uc591\uc774 \uc544\ub2c8\ub77c\ub294 \uac83\uc744 \uc5b4\ub5bb\uac8c \uc99d\uba85\ud560 \uc218 \uc788\ub098\uc694? K\ub294 \ud45c\ud604\ubc29\uc2dd\uc774 E,F,G\uc640 \uc774\uac83\ub4e4\uc758 \ubbf8\ubd84\ub4e4\ub85c \ud45c\ud604\ud560 \uc218 \uc788\uc73c\ubbc0\ub85c \ub0b4\uc7ac\uc801\ub7c9\uc778\uac8c \uc99d\uba85\uc774 \ub418\uc5c8\uc9c0\ub9cc H\uac00 \uadf8\ub807\uac8c \ub420 \uc218 \uc5c6\ub2e4\ub294 \uac83\uc740 \uc5b4\ub5bb\uac8c \ubcf4\uc77c \uc218 \uc788\ub294\uc9c0 \uad81\uae08\ud569\ub2c8\ub2e4. <\/p>\n<p> \uac10\uc0ac\ud569\ub2c8\ub2e4. <\/p>\n<p> A:\uadf8 \ubb38\uc81c\uc758 \ud78c\ud2b8\ub300\ub85c \uacc4\uc0b0\ud574\ubcf4\uba74 \uc54c \uc218 \uc788\uc5b4\uc694.  \uc6d0\uc8fc\uba74\uacfc \ud3c9\uba74\uc758 \uacc4\ub7c9\uae30\ub294 \ub4f1\uc7a5\uc801(isometric )\uc774\uc9c0\ub9cc \ud3c9\uade0 \uace1\ub960\uc744 \uacc4\uc0b0\ud574\ubcf4\uba74 \ud3c9\uba74\uc740 0\uc774 \ub098\uc624\uace0  \uc6d0\uc8fc\uba74\uc740 0\uc774 \ub098\uc624\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.   \ub2e4\uc74c\ubd80\ud130\ub294 \uc5f0\uc2b5\uc2dc\uac04\uc5d0 \uc9c8\ubb38\ud574 \uc8fc\uc138\uc694-   donsen 19OCT08 <\/p>\n<hr \/>\n<p> \uad50\uc218\ub2d8 \uc548\ub155\ud558\uc138\uc694. \ubbf8\ubd84\uae30\ud558 \uc218\uac15\ud558\uace0 \uc788\ub294 04\ud559\ubc88 \uc774\uc0c1\uaddc \uc785\ub2c8\ub2e4. <\/p>\n<p> \uc30d\uace1\ud3c9\uba74\uc5d0\uc11c\uc758 \uacc4\ub7c9\uae30\uac00 \uc798 \uc774\ud574\uac00\uc9c0 \uc54a\uc544 \uc9c8\ubb38\uc744 \ub4dc\ub9ac\uace0\uc790 \ud569\ub2c8\ub2e4. <\/p>\n<p> Q1) \uc30d\uace1\ud3c9\uba74 \uacc4\ub7c9\uae30 \uc815\uc758\uc5d0\uc11c E <code>1\/y^2, F<\/code> 0, G=1\/y^2 \uc73c\ub85c \ubcf4\ub294\uac8c \ub9de\ub098\uc694?  &#8221;&#8217;A&#8221;&#8217;: Upper Half Plane\uc774\uba74 \uc774\uac83\uc774 \ub9de\uc544\uc694. <\/p>\n<p> Q2) \ub9cc\uc77c \uadf8\uac8c \ub9de\ub2e4\uba74 \uc774\uac83\uc740 \uccab\uc9f8 \uae30\ubcf8 \ud615\uc2dd\uc5d0 \uc758\ud574 \uc815\uc758 \ub41c\uac8c \uc544\ub2c8\ub77c \uc784\uc758\ub85c \uc815\uc758\ub41c \uac83\uc774\ub77c \ud558\ub294\ub370 167\ucabd  \uc608\uc81c53 \uc911\uac04 \uc2dd\uc5d0 (Ex^2 + Fxy + Gy^2)^1\/2\ucc98\ub7fc \uc4f4 \uc774\uc720\ub294 \ubb34\uc5c7\uc778\uac00\uc694?(x=x\ubbf8\ubd84\uac12, y=y\ubbf8\ubd84\uac12)   &#8221;&#8217;A&#8221;&#8217;: \uc6b0\uc120 \uc774\ub807\uac8c \uc815\uc758\ud55c \uac83\uc774 \uc6b0\ub9ac \ub9c8\uc74c\ub300\ub85c \uc815\uc758\ud588\ub2e4\uace0 \ud558\ub354\ub77c\ub3c4 \uc6b0\ub9ac\uac00 \ubca1\ud130\uc758 \uae38\uc774\ub97c \uc774\uac83\uc744 \uc0ac\uc6a9\ud558\ub294 \uac83\uc73c\ub85c\ub9cc\ub3c4 \uc774\uac83\uc744 (\uc77c\ubc18\ud654\ub41c) \uc81c\uc77c\uae30\ubcf8\ud615\uc2dd\uc774\ub77c\uace0 \ud560 \uc218 \uc788\uc9c0\uc694.  \uc774\ub7f0 \ubaa8\uc591\uc73c\ub85c \uc4f0\ub294 \uc774\uc720\ub294 \ubb34\uc5c7\uc778\uac00\uc694?..121\ucabd \uc544\ub798\ucabd\uc5d0 3\ucc28\uc6d0\uc77c \ub54c 1\ud615\uc2dd\uacfc \ube44\uad50\ud55c \uac83\uacfc \ubcf4\uc558\uc744 \ub54c \uc65c \uadf8\ub7f0\uc9c0 \uc774\ud574\uac00 \uc798 \uac00\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. xy \ud56d\uc774 \uc788\ub294\uac83\uc774..   &#8221;&#8217;A&#8221;&#8217;: xy\ud56d\uc740 \uadf8\ub0e5 \uacf5\uc2dd\uc774\ub77c\uc11c \uc788\ub294 \uac83\uc774\uc9c0 F=0\uc774\ub2c8\uae4c \uc548 \uc4f4 \uac83\uc774\ub098 \ub9c8\ucc2c\uac00\uc9c0\uc774\uc9c0\uc694.  r(t)\uc758 \ub3c4\uba54\uc778\uc740 t\uc778\ub370, \ub808\uc778\uc9c0 \uc601\uc5ed\uc758 x,y\ub85c \ud45c\ud604 \ud55c \uac83\uc740 \uc5b4\ucc0c \ub41c\uac83\uc778\uc9c0 \uc774\ud574\uac00 \uc798 \uac00\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.   &#8221;&#8217;A&#8221;&#8217;: r(t)\uc758 \uc601\uc5ed\uacfc \uc0c1\uad00 \uc5c6\uc774 \uc6b0\ub9ac\ub294 \uc18d\ub3c4\ubca1\ud130\uc778 $ r'(t)$ \uc758 \ud06c\uae30\ub97c \uacc4\uc0b0\ud574\uc57c \ud558\ubbc0\ub85c, $ (\\dot{x}(t), \\dot{y}(t))$ \ub97c \uc81c1\uae30\ubcf8\ud615\uc2dd\uc744 \uc0ac\uc6a9\ud574\uc11c \ud06c\uae30\ub97c \uad6c\ud55c \uac81\ub2c8\ub2e4. <\/p>\n<p> Q3)\uadf8\ub9ac\uace0 \ud06c\ub9ac\uc2a4\ud1a0\ud384 \uc2ec\ubcfc \uacc4\uc0b0 \uacfc\uc815\uc5d0\uc11c \uadf8\uac83\uc740 3\ucc28\uc6d0\uc77c\ub54c X1,X2, N\uc758 \uacc4\uc218\ub4e4\ub85c X11, X22, X12\ub4f1\uc744 \ud45c\ud604\ud55c \uac83\uc778\ub370 \uc5ec\uae30\uc120 2\ucc28\uc6d0\uc778\ub370 \uc774\uac83\uc744 \uc5b4\ub5bb\uac8c \uc801\uc6a9\uc2dc\ud0a8\uac83\uc778\uc9c0 \uad81\uae08\ud569\ub2c8\ub2e4. \uadf8\ub0e5 3\ucc28\uc6d0\uc5d0 \uc788\ub294 \ud3c9\uba74 \uac1c\ub150\uc73c\ub85c \uc30d\uace1\ud3c9\uba74\uc744 \uc774\ud574\ud558\uac8c \ub418\ub294 \uac74\uac00\uc694?  &#8221;&#8217;A&#8221;&#8217;: \uc6b0\ub9ac\uac00 \uc55e\uc5d0\uc11c $ &Gamma;$ \ub97c \uacc4\uc0b0\ud560 \ub54c\ub294 $ N$ \uc744 \uc0ac\uc6a9\ud574\uc11c \uacc4\uc0b0\ud588\uc9c0\ub9cc \ub098\uc911\uc5d0 \uc774\uac83\uc740 $ N$ \uc744 \uc0ac\uc6a9\ud558\uc9c0 \uc54a\uace0 intrinsic\ud558\uac8c \uacc4\uc0b0\ud560 \uc218 \uc788\ub2e4\ub294 \uac83\uc744 \uc54c\uc558\uc9c0\uc694? $  g_{ij}$ \ub97c \uc368\uc11c \ud558\ub294 \uac70\uc9c0\uc694. \uadf8\ub7ec\ub2c8\uae4c \uc774\uc81c\ub294 3\ucc28\uc6d0 \uc548\uc5d0 \ub193\uc778 \uace1\uba74\uc774 \uc544\ub2c8\ub77c\ub3c4 $ g_{ij}$ \ub9cc \uc788\uc73c\uba74 $ &Gamma;$ \ub4e4\uc744 \uacc4\uc0b0\ud558\uace0 \uc0ac\uc6a9\ud560 \uc218 \uc788\uac8c \ub41c\uac70\uc9c0\uc694. \uc774\uac8c intrinsic geometry\uc774\uace0\uc694. <\/p>\n<p> \ub4a4\ub2a6\uac8c \uc9c8\ubb38\ub4dc\ub824 \uc8c4\uc1a1\ud569\ub2c8\ub2e4.. \uae30\ubcf8\uac1c\ub150\uc774 \ub9ce\uc774 \ubd80\uc871\ud55c\ub4ef\ud574\uc11c \uc798 \uc774\ud574\ud558\uc9c0 \ubabb\ud55c \ub4ef \ud569\ub2c8\ub2e4.\u3160 \ubaa8\ucabc\ub85d \ub2f5\ubcc0 \ubd80\ud0c1\ub4dc\ub9ac\uaca0\uc2b5\ub2c8\ub2e4. \uac10\uc0ac\ud569\ub2c8\ub2e4. <\/p>\n<p> \ub2f5\ubcc0 \uac10\uc0ac\ub4dc\ub9bd\ub2c8\ub2e4^^ 1\ub144\ub3d9\uc548 \uac10\uc0ac\ud569\ub2c8\ub2e4. \uc88b\uc740 \ubc29\ud559 \ub418\uc2dc\uae38 \ubc14\ub784\uac8c\uc694. <\/p>\n<\/div>\n<\/div>\n<div id=\"outline-container-orgba0b66f\" class=\"outline-2\">\n<h2 id=\"orgba0b66f\">[wiki:DiffGeometry2k8FallWithTutors \ub3c4\uc6b0\ubbf8 \uc120\uc0dd\ub2d8\uc774\ub791 \ud398\uc774\uc9c0]<\/h2>\n<div class=\"outline-text-2\" id=\"text-orgba0b66f\">\n<p> {{|\uc774\uacf3\uc5d0\uc11c \ub3c4\uc6b0\ubbf8 \uc120\uc0dd\ub2d8\uacfc \uc5f0\ub77d\ud558\uace0 \uc9c8\ubb38\ud558\uace0 \ud560 \uc218 \uc788\uc5b4\uc694. |}} <\/p>\n<hr \/>\n<p> {{|\ub3c4\uc6b0\ubbf8 \uc5f0\uc2b5 12\uc6d4 6\uc77c \uc6d4\uc694\uc77c \uc624\uc804 9\uc2dc-12\uc2dc \uc774\uacfc\ub300\ud559 107\ud638. email- donsen2@hotmail.com <\/p>\n<p> \ub3c4\uc6b0\ubbf8 \uc2e0\uccad\ud558\uc2e0 \ubd84\uc740 \ud559\ubc88\uc774\ub791 \uc774\ub984\uc744 \uc800\uc5d0\uac8c \ubcf4\ub0b4\uc8fc\uc154\uc57c \uc81c\uac00 \ucd5c\uc885 \ucc38\uc5ec \uc778\uc6d0 \uba85\ub2e8\uc744 \uc791\uc131\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.|}} <\/p>\n<hr \/>\n<p> CategoryKUMath <\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>(TableOfContents) \uac15\uc758 \uc9c4\ub3c4 (11\/26) (11\/24) (11\/19) (11\/17) (11\/12) (11\/10) (11\/5) (11\/3) (10\/29) (10\/27) (10\/22) (10\/20) \uc911\uac04\uc2dc\ud5d8 (10\/15) \ud734\uac15 (10\/13) \uce21\uc9c0\uace1\ub960 (10\/8) geodesic\uc758 \ubc29\uc815\uc2dd (10\/6) \ud68c\uc804\uba74\uc758 geodesic (10\/1) geodesic\uc758 \ubc29\uc815\uc2dd (9\/29) Codazzi-Mainardi\ubc29\uc815\uc2dd\uacfc \uace1\uba74\ub860\uc758 \uae30\ubcf8\uc815\ub9ac (9\/24) \uac00\uc6b0\uc2a4\uc758 \ub180\ub77c\uc6b4 \uc815\ub9ac (9\/22) \uacc4\ub7c9\uae30\uc758 \uacc4\uc0b0: \uad6c\uba74 (9\/17) \uacc4\ub7c9\uae30\uc758 \uacc4\uc0b0: \ud3c9\uba74\uacfc \uc6d0\uae30\ub465, \uc6d0\ubfd4 \ub4f1 (9\/10) \uacc4\ub7c9\uae30\uc758 \uc815\uc758 (9\/8) \ud574\uc11d\ud559 review: \ubbf8\ubd84\ud615\uc2dd\uc774\ub780? &#8230; <a title=\"\ubbf8\ubd84\uae30\ud558\ud559II 2K8 \uac00\uc744 \ud559\uae30\" class=\"read-more\" href=\"https:\/\/mathematicians.korea.ac.kr\/ywkim\/2008\/12\/18\/%eb%af%b8%eb%b6%84%ea%b8%b0%ed%95%98%ed%95%99ii-2k8-%ea%b0%80%ec%9d%84-%ed%95%99%ea%b8%b0\/\" aria-label=\"\ubbf8\ubd84\uae30\ud558\ud559II 2K8 \uac00\uc744 \ud559\uae30\uc5d0 \ub300\ud574 \ub354 \uc790\uc138\ud788 \uc54c\uc544\ubcf4\uc138\uc694\">\ub354 \uc77d\uae30<\/a><\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[11],"tags":[],"class_list":["post-3356","post","type-post","status-publish","format-standard","hentry","category-lectures"],"distributor_meta":false,"distributor_terms":false,"distributor_media":false,"distributor_original_site_name":"\uae40\uc601\uc6b1","distributor_original_site_url":"https:\/\/mathematicians.korea.ac.kr\/ywkim","push-errors":false,"_links":{"self":[{"href":"https:\/\/mathematicians.korea.ac.kr\/ywkim\/wp-json\/wp\/v2\/posts\/3356","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mathematicians.korea.ac.kr\/ywkim\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mathematicians.korea.ac.kr\/ywkim\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mathematicians.korea.ac.kr\/ywkim\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/mathematicians.korea.ac.kr\/ywkim\/wp-json\/wp\/v2\/comments?post=3356"}],"version-history":[{"count":1,"href":"https:\/\/mathematicians.korea.ac.kr\/ywkim\/wp-json\/wp\/v2\/posts\/3356\/revisions"}],"predecessor-version":[{"id":3357,"href":"https:\/\/mathematicians.korea.ac.kr\/ywkim\/wp-json\/wp\/v2\/posts\/3356\/revisions\/3357"}],"wp:attachment":[{"href":"https:\/\/mathematicians.korea.ac.kr\/ywkim\/wp-json\/wp\/v2\/media?parent=3356"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mathematicians.korea.ac.kr\/ywkim\/wp-json\/wp\/v2\/categories?post=3356"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mathematicians.korea.ac.kr\/ywkim\/wp-json\/wp\/v2\/tags?post=3356"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}