{"id":467,"date":"2012-11-10T22:20:45","date_gmt":"2012-11-10T13:20:45","guid":{"rendered":"http:\/\/www.roundown.net\/nyushi\/?p=467"},"modified":"2021-09-23T10:18:55","modified_gmt":"2021-09-23T01:18:55","slug":"thr201201","status":"publish","type":"post","link":"https:\/\/www.roundown.net\/nyushi\/thr201201\/","title":{"rendered":"\u6771\u5317\u5927\u7406\u7cfb2012\uff1a\u7b2c1\u554f"},"content":{"rendered":"<hr \/>\n<p>\\(s , t\\) \u3092\u5b9f\u6570\u3068\u3059\u308b. \u4ee5\u4e0b\u306e\u554f\u3044\u306b\u7b54\u3048\u3088.<\/p>\r\n<ol>\r\n<li><p><strong>(1)<\/strong>\u3000\\(x = s+t+1 , \\ y = s-t-1\\) \u3068\u304a\u304f. \\(s , t\\) \u304c \\(s \\geqq 0 , \\ t \\geqq 0\\) \u306e\u7bc4\u56f2\u3092\u52d5\u304f\u3068\u304d, \u70b9 \\((x,y)\\) \u306e\u52d5\u304f\u7bc4\u56f2\u3092\u5ea7\u6a19\u5e73\u9762\u5185\u306b\u56f3\u793a\u305b\u3088.<\/p><\/li>\r\n<li><p><strong>(2)<\/strong>\u3000\\(x = st+s-t+1 , \\ y = s+t-1\\) \u3068\u304a\u304f. \\(s , t\\) \u304c\u5b9f\u6570\u5168\u4f53\u3092\u52d5\u304f\u3068\u304d, \u70b9 \\((x,y)\\) \u306e\u52d5\u304f\u7bc4\u56f2\u3092\u5ea7\u6a19\u5e73\u9762\u5185\u306b\u56f3\u793a\u305b\u3088.<\/p><\/li>\r\n<\/ol>\r\n<hr \/>\r\n<!--more-->\r\n<h4>\u3010 \u89e3 \u7b54 \u3011<\/h4>\r\n<p><strong>(1)<\/strong><\/p>\r\n<p>\u6761\u4ef6\u3088\u308a\r\n\\[\r\n\\left( \\begin{array}{c} x \\\\ y \\end{array} \\right) = \\left( \\begin{array}{c} 1 \\\\ -1 \\end{array} \\right) +s \\left( \\begin{array}{c} 1 \\\\ 1 \\end{array} \\right) +t \\left( \\begin{array}{c} 1 \\\\ -1 \\end{array} \\right)\n\\]\r\n\u3053\u308c\u3068 \\(s \\geqq 0 , \\ t \\geqq 0\\) \u3088\u308a, \u6c42\u3081\u308b\u7bc4\u56f2\u306f\u4e0b\u56f3\u659c\u7dda\u90e8\uff08\u5883\u754c\u542b\u3080\uff09.<\/p>\r\n<img decoding=\"async\" src=\"\/\/www.roundown.net\/nyushi\/wp-content\/uploads\/tohoku_r_2012_01_01.png\" alt=\"\" title=\"tohoku_r_2012_01_01\" class=\"aligncenter size-full\" \/>\r\n<p><strong>(2)<\/strong><\/p>\r\n<p>\\(t = y-s+1\\) \u306a\u306e\u3067, \\(t\\) \u3092\u6d88\u53bb\u3059\u308b\u3068\r\n\\[\\begin{align}\r\nx & = s( y-s+1 ) +s -( y-s+1 ) +1 \\\\\r\n\\text{\u2234} \\quad & s^2 -(y+3)s +x+y = 0\n\\end{align}\\]\r\n\u5b9f\u6570 \\(s\\) \u304c\u5b58\u5728\u3059\u308b\u306e\u3067, \u5224\u5225\u5f0f \\(D\\) \u306b\u3064\u3044\u3066\r\n\\[\\begin{align}\r\nD & = (y+3)^2 -4(x+y) \\geqq 0 \\\\\r\n4x & \\leqq y^2+2y+9 \\\\\r\n\\text{\u2234} \\quad x & \\leqq \\dfrac{(y+1)^2}{4} +2\n\\end{align}\\]\r\n\u3088\u3063\u3066, \u6c42\u3081\u308b\u7bc4\u56f2\u306f\u4e0b\u56f3\u659c\u7dda\u90e8\uff08\u5883\u754c\u542b\u3080\uff09.<\/p>\r\n<img decoding=\"async\" src=\"\/\/www.roundown.net\/nyushi\/wp-content\/uploads\/tohoku_r_2012_01_02.png\" alt=\"\" title=\"tohoku_r_2012_01_02\" class=\"aligncenter size-full\" \/>\r\n","protected":false},"excerpt":{"rendered":"\\(s , t\\) \u3092\u5b9f\u6570\u3068\u3059\u308b. \u4ee5\u4e0b\u306e\u554f\u3044\u306b\u7b54\u3048\u3088. (1)\u3000\\(x = s+t+1 , \\ y = s-t-1\\) \u3068\u304a\u304f. \\(s , t\\) \u304c \\(s \\geqq 0 , \\ t \\geqq 0\\) \u306e\u7bc4\u56f2\u3092 &hellip; <a href=\"https:\/\/www.roundown.net\/nyushi\/thr201201\/\">\u7d9a\u304d\u3092\u8aad\u3080 <span class=\"meta-nav\">&rarr;<\/span><\/a>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[72],"tags":[68,148],"class_list":["post-467","post","type-post","status-publish","format-standard","hentry","category-tohoku_r_2012","tag-68","tag-tohoku_r"],"_links":{"self":[{"href":"https:\/\/www.roundown.net\/nyushi\/wp-json\/wp\/v2\/posts\/467","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.roundown.net\/nyushi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.roundown.net\/nyushi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.roundown.net\/nyushi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.roundown.net\/nyushi\/wp-json\/wp\/v2\/comments?post=467"}],"version-history":[{"count":0,"href":"https:\/\/www.roundown.net\/nyushi\/wp-json\/wp\/v2\/posts\/467\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.roundown.net\/nyushi\/wp-json\/wp\/v2\/media?parent=467"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.roundown.net\/nyushi\/wp-json\/wp\/v2\/categories?post=467"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.roundown.net\/nyushi\/wp-json\/wp\/v2\/tags?post=467"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}