{"id":40102,"date":"2019-06-16T12:01:17","date_gmt":"2019-06-16T09:01:17","guid":{"rendered":"http:\/\/omathimatikos.gr\/?p=40102"},"modified":"2019-06-15T09:04:54","modified_gmt":"2019-06-15T06:04:54","slug":"%ce%bf-%ce%bc%ce%b5%ce%b3%ce%b1%ce%bb%ce%bf%cf%86%cf%85%ce%ae%cf%82-%ce%ba%cf%8d%cf%81%ce%b9%ce%bf%cf%82-%cf%80%ce%ad%cf%81%ce%b5%ce%bb%ce%bc%ce%b1%ce%bd-%ce%b7-%ce%b5%ce%b9%ce%ba%ce%b1%cf%83%ce%af","status":"publish","type":"post","link":"https:\/\/omathimatikos.gr\/?p=40102","title":{"rendered":"\u039f \u03bc\u03b5\u03b3\u03b1\u03bb\u03bf\u03c6\u03c5\u03ae\u03c2 \u03ba\u03cd\u03c1\u03b9\u03bf\u03c2 \u03a0\u03ad\u03c1\u03b5\u03bb\u03bc\u03b1\u03bd. \u0397 \u03b5\u03b9\u03ba\u03b1\u03c3\u03af\u03b1 \u03c4\u03bf\u03c5 Poincare."},"content":{"rendered":"<p><!--more--><\/p>\n<p>\u0393\u03b9\u03b1 \u03bb\u03cc\u03b3\u03bf\u03c5\u03c2 \u03ba\u03b1\u03b8\u03b1\u03c1\u03ac \u03b5\u03c0\u03bf\u03c0\u03c4\u03b9\u03ba\u03bf\u03cd\u03c2 \u03b8\u03b1 \u03c0\u03b5\u03c1\u03b9\u03b3\u03c1\u03ac\u03c8\u03bf\u03c5\u03bc\u03b5 \u03b1\u03c1\u03c7\u03b9\u03ba\u03ac \u03c4\u03bf \u03c0\u03c1\u03cc\u03b2\u03bb\u03b7\u03bc\u03b1, \u03c0\u03bf\u03c5 \u03b8\u03ad\u03c4\u03b5\u03b9 \u03b7 \u03b5\u03b9\u03ba\u03b1\u03c3\u03af\u03b1 \u03c4\u03bf\u03c5<strong>Poincar\u00e9<\/strong>,\u00a0 \u03c3\u03c4\u03b9\u03c2 2-\u03c0\u03bf\u03bb\u03bb\u03b1\u03c0\u03bb\u03cc\u03c4\u03b7\u03c4\u03b5\u03c2 \u03b4\u03b7\u03bb\u03b1\u03b4\u03ae \u03c3\u03c4\u03b9\u03c2 \u03b5\u03c0\u03b9\u03c6\u03ac\u03bd\u03b5\u03b9\u03b5\u03c2 \u03c4\u03bf\u03c5 \u03c4\u03c1\u03b9\u03c3\u03b4\u03b9\u03ac\u03c3\u03c4\u03b1\u03c4\u03bf\u03c5 \u03b5\u03c5\u03ba\u03bb\u03b5\u03af\u03b4\u03b5\u03b9\u03bf\u03c5 \u03c7\u03ce\u03c1\u03bf\u03c5. \u039c\u03b9\u03b1 2-\u03c0\u03bf\u03bb\u03bb\u03b1\u03c0\u03bb\u03cc\u03c4\u03b7\u03c4\u03b1 \u03bf\u03bd\u03bf\u03bc\u03ac\u03b6\u03b5\u03c4\u03b1\u03b9 \u03b1\u03c0\u03bb\u03ce\u03c2 \u03c3\u03c5\u03bd\u03b5\u03ba\u03c4\u03b9\u03ba\u03ae\u00a0 (simply connected) \u03b1\u03bd \u03ba\u03ac\u03b8\u03b5 \u03ba\u03bb\u03b5\u03b9\u03c3\u03c4\u03ae \u03ba\u03b1\u03bc\u03c0\u03cd\u03bb\u03b7 \u03c0\u03bf\u03c5 \u03b2\u03c1\u03af\u03c3\u03ba\u03b5\u03c4\u03b1\u03b9 \u03c0\u03ac\u03bd\u03c9 \u03c3\u03b5 \u03b1\u03c5\u03c4\u03ae \u03bc\u03c0\u03bf\u03c1\u03b5\u03af \u03bd\u03b1\u00a0 \u00ab\u03c3\u03c5\u03c1\u03c1\u03b9\u03ba\u03bd\u03c9\u03b8\u03b5\u03af\u00bb, \u03c0\u03b1\u03c1\u03b1\u03bc\u03ad\u03bd\u03bf\u03bd\u03c4\u03b1\u03c2 \u03c0\u03ac\u03bd\u03c9 \u03c3\u03c4\u03b7\u03bd \u03b5\u03c0\u03b9\u03c6\u03ac\u03bd\u03b5\u03b9\u03b1, \u03c3\u03b5 \u03ad\u03bd\u03b1 \u03bc\u03cc\u03bd\u03bf \u03c3\u03b7\u03bc\u03b5\u03af\u03bf. \u0393\u03b9\u03b1 \u03c0\u03b1\u03c1\u03ac\u03b4\u03b5\u03b9\u03b3\u03bc\u03b1, \u03b7 \u03b5\u03c0\u03b9\u03c6\u03ac\u03bd\u03b5\u03b9\u03b1 \u03c4\u03b7\u03c2 \u03b3\u03bd\u03c9\u03c3\u03c4\u03ae\u03c2 \u03bc\u03b1\u03c2 \u03c3\u03c6\u03b1\u03af\u03c1\u03b1\u03c2 (\u03bc\u03c0\u03ac\u03bb\u03b1\u03c2) \u03b5\u03af\u03bd\u03b1\u03b9 \u03b1\u03c0\u03bb\u03ce\u03c2 \u03c3\u03c5\u03bd\u03b5\u03ba\u03c4\u03b9\u03ba\u03ae 2-\u03c0\u03bf\u03bb\u03bb\u03b1\u03c0\u03bb\u03cc\u03c4\u03b7\u03c4\u03b1.<\/p>\n<p>\u0394\u03b5 \u03c3\u03c5\u03bc\u03b2\u03b1\u03af\u03bd\u03b5\u03b9 \u03cc\u03bc\u03c9\u03c2 \u03c4\u03bf \u03af\u03b4\u03b9\u03bf \u03ba\u03b1\u03b9 \u03bc\u03b5 \u03c4\u03bf\u03bd \u03c4\u03cc\u03c1\u03bf \u03b4\u03b7\u03bb\u03b1\u03b4\u03ae \u03c4\u03b7\u03bd \u03b5\u03c0\u03b9\u03c6\u03ac\u03bd\u03b5\u03b9\u03b1 \u03c4\u03bf\u03c5 \u00ab\u03bd\u03c4\u03cc\u03bd\u03b1\u03c4\u00bb. \u03a0\u03c1\u03ac\u03b3\u03bc\u03b1\u03c4\u03b9, \u03c5\u03c0\u03ac\u03c1\u03c7\u03bf\u03c5\u03bd \u03ba\u03bb\u03b5\u03b9\u03c3\u03c4\u03ad\u03c2 \u03ba\u03b1\u03bc\u03c0\u03cd\u03bb\u03b5\u03c2 \u03c3\u03c4\u03bf\u03bd \u03c4\u03cc\u03c1\u03bf \u03bf\u03b9 \u03bf\u03c0\u03bf\u03af\u03b5\u03c2 \u03b4\u03b5\u03bd \u03bc\u03c0\u03bf\u03c1\u03bf\u03cd\u03bd \u03bd\u03b1 \u03c3\u03c5\u03c1\u03c1\u03b9\u03ba\u03bd\u03c9\u03b8\u03bf\u03cd\u03bd \u03c3\u03b5 \u03c3\u03b7\u03bc\u03b5\u03af\u03bf \u03ba\u03c1\u03b1\u03c4\u03ce\u03bd\u03c4\u03b1\u03c2 \u03c4\u03b7\u03bd \u03b5\u03c0\u03b1\u03c6\u03ae \u03c4\u03bf\u03c5\u03c2 \u03bc\u03b5 \u03c4\u03b7\u03bd \u03b5\u03c0\u03b9\u03c6\u03ac\u03bd\u03b5\u03b9\u03b1.<\/p>\n<p>\u038c\u03bb\u03b5\u03c2 \u03bf\u03b9 \u03b1\u03c0\u03bb\u03ce\u03c2 \u03c3\u03c5\u03bd\u03b5\u03ba\u03c4\u03b9\u03ba\u03ad\u03c2 2-\u03c0\u03bf\u03bb\u03bb\u03b1\u03c0\u03bb\u03cc\u03c4\u03b7\u03c4\u03b5\u03c2, \u03bc\u03b5 \u03cc\u03c1\u03bf\u03c5\u03c2 \u03c4\u03b7\u03c2 \u03c4\u03bf\u03c0\u03bf\u03bb\u03bf\u03b3\u03af\u03b1\u03c2, \u03b5\u03af\u03bd\u03b1\u03b9 \u03cc\u03bc\u03bf\u03b9\u03b5\u03c2 \u03bc\u03b5\u03c4\u03b1\u03be\u03cd \u03c4\u03bf\u03c5\u03c2. \u0397 \u03b5\u03c0\u03b9\u03c6\u03ac\u03bd\u03b5\u03b9\u03b1 \u03b5\u03bd\u03cc\u03c2 \u03b1\u03c5\u03b3\u03bf\u03cd \u03b3\u03b9\u03b1 \u03c0\u03b1\u03c1\u03ac\u03b4\u03b5\u03b9\u03b3\u03bc\u03b1 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03bf\u03c0\u03bf\u03bb\u03bf\u03b3\u03b9\u03ba\u03ac \u03cc\u03bc\u03bf\u03b9\u03b1 \u03bc\u03b5 \u03c4\u03b7\u03bd \u03b5\u03c0\u03b9\u03c6\u03ac\u03bd\u03b5\u03b9\u03b1 \u03c4\u03b7\u03c2 \u03c3\u03c6\u03b1\u03af\u03c1\u03b1\u03c2.<\/p>\n<p>\u039c\u03b5\u03c4\u03b1\u03be\u03cd \u03cc\u03bb\u03c9\u03bd \u03c4\u03c9\u03bd \u03b5\u03c0\u03b9\u03c6\u03b1\u03bd\u03b5\u03b9\u03ce\u03bd\u00a0 \u03b7 \u03c3\u03c6\u03b1\u03af\u03c1\u03b1 \u03ba\u03b1\u03c4\u03b1\u03bb\u03b1\u03bc\u03b2\u03ac\u03bd\u03b5\u03b9 \u03bc\u03b9\u03b1 \u03b1\u03be\u03b9\u03bf\u03c3\u03b7\u03bc\u03b5\u03af\u03c9\u03c4\u03b7 \u03b8\u03ad\u03c3\u03b7 \u03b5\u03c0\u03b5\u03b9\u03b4\u03ae \u03b5\u03af\u03bd\u03b1\u03b9 \u03b7 \u03bc\u03cc\u03bd\u03b7 \u03b5\u03c0\u03b9\u03c6\u03ac\u03bd\u03b5\u03b9\u03b1 \u03c0\u03bf\u03c5 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c3\u03c5\u03b3\u03c7\u03c1\u03cc\u03bd\u03c9\u03c2 \u03c7\u03c9\u03c1\u03af\u03c2 \u03cc\u03c1\u03b9\u03b1, \u03b1\u03c0\u03bb\u03ac \u03c3\u03c5\u03bd\u03b5\u03ba\u03c4\u03b9\u03ba\u03ae \u03ba\u03b1\u03b9 \u03c3\u03c5\u03bc\u03c0\u03b1\u03b3\u03ae\u03c2 (\u03c0\u03bf\u03c5 \u03c3\u03b7\u03bc\u03b1\u03af\u03bd\u03b5\u03b9 \u03c7\u03bf\u03bd\u03c4\u03c1\u03b9\u03ba\u03ac \u03cc\u03c4\u03b9 \u03bf\u03c1\u03b9\u03bf\u03b8\u03b5\u03c4\u03b5\u03af\u03c4\u03b1\u03b9 \u03bc\u03ad\u03c3\u03b1 \u03c3\u03c4\u03bf \u03c7\u03ce\u03c1\u03bf, \u03b1\u03bd\u03c4\u03b9\u03b8\u03ad\u03c4\u03c9\u03c2 \u03bc\u03b5 \u03c4\u03bf \u03b5\u03c0\u03af\u03c0\u03b5\u03b4\u03bf). \u0397 \u03b4\u03b9\u03b1\u03af\u03c3\u03b8\u03b7\u03c3\u03b7 \u03c4\u03bf\u03c5 Poincar\u00e9 \u03c0\u03c1\u03bf\u03ad\u03b2\u03bb\u03b5\u03c8\u03b5 \u03cc\u03c4\u03b9 \u03b7 \u03b9\u03b4\u03b9\u03cc\u03c4\u03b7\u03c4\u03b1 \u03b1\u03c5\u03c4\u03ae \u03c4\u03b7\u03c2 \u03c3\u03c6\u03b1\u03af\u03c1\u03b1\u03c2 (\u03b1\u03c0\u03bf\u03c5\u03c3\u03af\u03b1 \u03bf\u03c1\u03af\u03c9\u03bd, \u03c3\u03c5\u03bc\u03c0\u03ac\u03b3\u03b5\u03b9\u03b1 \u03ba\u03b1\u03b9 \u03b1\u03c0\u03bb\u03ae \u03c3\u03c5\u03bd\u03b5\u03ba\u03c4\u03b9\u03ba\u03cc\u03c4\u03b7\u03c4\u03b1) \u03c7\u03b1\u03c1\u03b1\u03ba\u03c4\u03b7\u03c1\u03af\u03b6\u03b5\u03b9 \u03cc\u03c7\u03b9 \u03bc\u03cc\u03bd\u03bf \u03c4\u03b7 \u03c3\u03c5\u03bd\u03b7\u03b8\u03b9\u03c3\u03bc\u03ad\u03bd\u03b7 \u03c3\u03c6\u03b1\u03af\u03c1\u03b1 \u03b1\u03bb\u03bb\u03ac \u03b5\u03c0\u03af\u03c3\u03b7\u03c2 \u03c4\u03b9\u03c2 \u03c3\u03c6\u03b1\u03af\u03c1\u03b5\u03c2 \u03b1\u03bd\u03ce\u03c4\u03b5\u03c1\u03b7\u03c2 \u03b4\u03b9\u03ac\u03c3\u03c4\u03b1\u03c3\u03b7\u03c2.<\/p>\n<blockquote><p><strong>\u0397 \u03c3\u03c0\u03bf\u03c5\u03b4\u03b1\u03af\u03b1 \u03b5\u03c1\u03ce\u03c4\u03b7\u03c3\u03b7 \u03c0\u03bf\u03c5 \u03ad\u03ba\u03b1\u03bd\u03b5 \u03c4\u03bf 1904 \u03bf \u0396\u03b9\u03bb \u0391\u03bd\u03c1\u03af \u03a0\u03bf\u03c5\u03b1\u03bd\u03ba\u03b1\u03c1\u03ad (1854-1912), \u03b2\u03b1\u03c3\u03ac\u03bd\u03b9\u03b6\u03b5 \u03c4\u03bf\u03c5\u03c2 \u03bc\u03b1\u03b8\u03b7\u03bc\u03b1\u03c4\u03b9\u03ba\u03bf\u03cd\u03c2 \u03b3\u03b9\u03b1 \u03c3\u03c7\u03b5\u03b4\u03cc\u03bd \u03ad\u03bd\u03b1\u03bd \u03b1\u03b9\u03ce\u03bd\u03b1. \u0397 \u03b5\u03b9\u03ba\u03b1\u03c3\u03af\u03b1 \u03c0\u03bf\u03c5 \u03b1\u03bd\u03ae\u03ba\u03b5\u03b9 \u03c3\u03c4\u03bf\u03bd \u03c7\u03ce\u03c1\u03bf \u03c4\u03b7\u03c2 \u03c4\u03bf\u03c0\u03bf\u03bb\u03bf\u03b3\u03af\u03b1\u03c2 \u03ba\u03b1\u03b9 \u03b4\u03b7\u03bb\u03ce\u03bd\u03b5\u03b9 \u03cc\u03c4\u03b9:\u00a0\u03cc\u03bb\u03b5\u03c2 \u03bf\u03b9 \u03c3\u03c5\u03bc\u03c0\u03b1\u03b3\u03b5\u03af\u03c2 \u03c0\u03bf\u03bb\u03bb\u03b1\u03c0\u03bb\u03cc\u03c4\u03b7\u03c4\u03b5\u03c2 \u03b4\u03b9\u03ac\u03c3\u03c4\u03b1\u03c3\u03b7\u03c2 n = 3 (\u03ae \u03c0\u03b5\u03c1\u03b9\u03c3\u03c3\u03cc\u03c4\u03b5\u03c1\u03bf), \u03c7\u03c9\u03c1\u03af\u03c2 \u03cc\u03c1\u03b9\u03b1 \u03ba\u03b1\u03b9 \u03b1\u03c0\u03bb\u03ac \u03c3\u03c5\u03bd\u03b5\u03ba\u03c4\u03b9\u03ba\u03ad\u03c2, \u03b5\u03af\u03bd\u03b1\u03b9 \u03bf\u03bc\u03bf\u03b9\u03bf\u03bc\u03bf\u03c1\u03c6\u03b9\u03ba\u03ad\u03c2 \u03c3\u03b5 \u03bc\u03b9\u03b1 \u03c3\u03c6\u03b1\u03af\u03c1\u03b1 \u03b4\u03b9\u03ac\u03c3\u03c4\u03b1\u03c3\u03b7\u03c2 n.<\/strong><\/p>\n<p><a href=\"https:\/\/i0.wp.com\/hea.edu.gr\/wp-content\/uploads\/2016\/08\/poin.jpg\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-9654 size-large\" src=\"https:\/\/i0.wp.com\/hea.edu.gr\/wp-content\/uploads\/2016\/08\/poin-1024x786.jpg?resize=700%2C538\" sizes=\"(max-width: 940px) 100vw, 940px\" srcset=\"https:\/\/www.hea.edu.gr\/wp-content\/uploads\/2016\/08\/poin-1024x786.jpg 1024w, https:\/\/www.hea.edu.gr\/wp-content\/uploads\/2016\/08\/poin-300x230.jpg 300w, https:\/\/www.hea.edu.gr\/wp-content\/uploads\/2016\/08\/poin-768x589.jpg 768w, https:\/\/www.hea.edu.gr\/wp-content\/uploads\/2016\/08\/poin.jpg 1600w\" alt=\"poin\" width=\"700\" height=\"538\" data-recalc-dims=\"1\" \/><\/a><\/p>\n<p>\u039f \u03a0\u03bf\u03c5\u03b1\u03bd\u03ba\u03b1\u03c1\u03ad \u03c3\u03c5\u03c7\u03bd\u03ac \u03c0\u03b5\u03c1\u03b9\u03b3\u03c1\u03ac\u03c6\u03b5\u03c4\u03b1\u03b9 \u03c9\u03c2 \u03c0\u03bf\u03bb\u03c5\u03bc\u03b1\u03b8\u03ae\u03c2, \u03ba\u03b1\u03b9 \u03c3\u03c4\u03bf\u03bd \u03ba\u03cc\u03c3\u03bc\u03bf \u03c4\u03c9\u03bd \u03bc\u03b1\u03b8\u03b7\u03bc\u03b1\u03c4\u03b9\u03ba\u03ce\u03bd \u03b5\u03af\u03bd\u03b1\u03b9 \u03b3\u03bd\u03c9\u03c3\u03c4\u03cc\u03c2 \u03c9\u03c2 \u03bf \u00ab\u03c4\u03b5\u03bb\u03b5\u03c5\u03c4\u03b1\u03af\u03bf\u03c2 \u03c0\u03b1\u03bd\u03b5\u03c0\u03b9\u03c3\u03c4\u03ae\u03bc\u03bf\u03bd\u03b1\u03c2\u00bb, \u03ba\u03b1\u03b8\u03ce\u03c2 \u03b4\u03b9\u03ad\u03c0\u03c1\u03b5\u03c0\u03b5 \u03c3\u03b5 \u03cc\u03bb\u03b1 \u03c4\u03b1 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\u03b1\u03c1\u03ba\u03b5\u03c4\u03ac \u03c7\u03c1\u03cc\u03bd\u03b9\u03b1 \u03c0\u03bf\u03bb\u03bb\u03bf\u03af \u03b5\u03c1\u03b3\u03ac\u03c3\u03c4\u03b7\u03ba\u03b1\u03bd \u03c0\u03ac\u03bd\u03c9 \u03c3\u03c4\u03b7\u03bd \u0395\u03b9\u03ba\u03b1\u03c3\u03af\u03b1 \u03a0\u03bf\u03c5\u03b1\u03bd\u03ba\u03b1\u03c1\u03ad, \u03ad\u03bd\u03b1 \u03b1\u03c0\u03cc \u03c4\u03b1 \u03b5\u03c0\u03c4\u03ac \u00ab\u03b5\u03c0\u03b9\u03ba\u03b7\u03c1\u03c5\u03b3\u03bc\u03ad\u03bd\u03b1\u00bb \u03c0\u03c1\u03bf\u03b2\u03bb\u03ae\u03bc\u03b1\u03c4\u03b1 \u2013 \u03c0\u03bf\u03c5 \u03c4\u03b1\u03bb\u03ac\u03bd\u03b9\u03b6\u03b5 \u03c4\u03bf\u03c5\u03c2 \u03c3\u03b7\u03bc\u03b1\u03bd\u03c4\u03b9\u03ba\u03cc\u03c4\u03b5\u03c1\u03bf\u03c5\u03c2 \u03bc\u03b1\u03b8\u03b7\u03bc\u03b1\u03c4\u03b9\u03ba\u03bf\u03cd\u03c2 \u03b1\u03c0\u03cc \u03c4\u03b9\u03c2 \u03b1\u03c1\u03c7\u03ad\u03c2 \u03c4\u03bf\u03c5 20\u03bf\u03cd \u03b1\u03b9\u03ce\u03bd\u03b1. \u0395\u03af\u03c7\u03b1\u03bd 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\u03c0\u03c1\u03bf\u03b2\u03bb\u03ae\u03bc\u03b1\u03c4\u03bf\u03c2. \u03a4\u03b5\u03bb\u03b9\u03ba\u03ac, \u03c4\u03bf 2002, \u03c4\u03bf \u03c0\u03c1\u03cc\u03b2\u03bb\u03b7\u03bc\u03b1 \u03b2\u03c1\u03ae\u03ba\u03b5 \u03c4\u03bf\u03bd \u00ab\u03b4\u03ac\u03c3\u03ba\u03b1\u03bb\u03cc\u00bb \u03c4\u03bf\u03c5. \u0388\u03c0\u03b5\u03b9\u03c4\u03b1 \u03b1\u03c0\u03cc \u03bf\u03ba\u03c4\u03ce \u03c7\u03c1\u03cc\u03bd\u03b9\u03b1 \u03c0\u03c1\u03bf\u03c3\u03c0\u03b1\u03b8\u03b5\u03b9\u03ce\u03bd, \u03bf \u03a1\u03ce\u03c3\u03bf\u03c2 \u03bc\u03b1\u03b8\u03b7\u03bc\u03b1\u03c4\u03b9\u03ba\u03cc\u03c2\u00a0<strong>\u0393\u03ba\u03c1\u03b9\u03b3\u03ba\u03cc\u03c1\u03b9 \u03a0\u03ad\u03c1\u03b5\u03bb\u03bc\u03b1\u03bd<\/strong>, \u03b3\u03b5\u03bd\u03bd\u03b7\u03bc\u03ad\u03bd\u03bf\u03c2 \u03c3\u03c4\u03b7\u03bd \u0391\u03b3\u03af\u03b1 \u03a0\u03b5\u03c4\u03c1\u03bf\u03cd\u03c0\u03bf\u03bb\u03b7 \u03c4\u03bf 1966, \u03ba\u03b1\u03c4\u03ad\u03bb\u03b7\u03be\u03b5 \u03c3\u03b5 \u03bc\u03b9\u03b1 \u03b1\u03c0\u03cc\u03b4\u03b5\u03b9\u03be\u03b7 473 \u03c3\u03b5\u03bb\u03af\u03b4\u03c9\u03bd, \u03c0\u03c1\u03bf\u03ba\u03b1\u03bb\u03ce\u03bd\u03c4\u03b1\u03c2 \u03c6\u03c1\u03b5\u03bd\u03af\u03c4\u03b9\u03b4\u03b1 \u03c3\u03c4\u03b7\u03bd \u03c0\u03b1\u03b3\u03ba\u03cc\u03c3\u03bc\u03b9\u03b1 \u03bc\u03b1\u03b8\u03b7\u03bc\u03b1\u03c4\u03b9\u03ba\u03ae \u03ba\u03bf\u03b9\u03bd\u03cc\u03c4\u03b7\u03c4\u03b1.<\/p>\n<p><strong>\u039f \u0393\u03ba\u03c1\u03b9\u03b3\u03ba\u03cc\u03c1\u03b9 \u03a0\u03ad\u03c1\u03b5\u03bb\u03bc\u03b1\u03bd (\u0413\u0440\u0438\u0433\u043e\u0301\u0440\u0438\u0439 \u042f\u0301\u043a\u043e\u0432\u043b\u0435\u0432\u0438\u0447 \u041f\u0435\u0440\u0435\u043b\u044c\u043c\u0430\u0301\u043d)<\/strong><\/p>\n<p><a href=\"https:\/\/i0.wp.com\/hea.edu.gr\/wp-content\/uploads\/2016\/08\/perelman.jpg\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-9653 size-large\" src=\"https:\/\/i0.wp.com\/hea.edu.gr\/wp-content\/uploads\/2016\/08\/perelman-1024x614.jpg?resize=700%2C420\" sizes=\"(max-width: 940px) 100vw, 940px\" srcset=\"https:\/\/www.hea.edu.gr\/wp-content\/uploads\/2016\/08\/perelman-1024x614.jpg 1024w, https:\/\/www.hea.edu.gr\/wp-content\/uploads\/2016\/08\/perelman-300x180.jpg 300w, https:\/\/www.hea.edu.gr\/wp-content\/uploads\/2016\/08\/perelman-768x461.jpg 768w\" alt=\"perelman\" width=\"700\" height=\"420\" data-recalc-dims=\"1\" \/><\/a><\/p>\n<blockquote><p>\u039f \u03a0\u03ad\u03c1\u03b5\u03bb\u03bc\u03b1\u03bd \u03c6\u03bf\u03af\u03c4\u03b7\u03c3\u03b5 \u03c3\u03b5 \u03c3\u03c7\u03bf\u03bb\u03b5\u03af\u03bf \u03c4\u03b7\u03c2 \u0391\u03b3\u03af\u03b1\u03c2 \u03a0\u03b5\u03c4\u03c1\u03bf\u03cd\u03c0\u03bf\u03bb\u03b7\u03c2 \u03bc\u03b5 \u03b5\u03b9\u03b4\u03af\u03ba\u03b5\u03c5\u03c3\u03b7 \u03c3\u03c4\u03b1 \u039c\u03b1\u03b8\u03b7\u03bc\u03b1\u03c4\u03b9\u03ba\u03ac \u03ba\u03b1\u03b9 \u03c4\u03b7 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\u03c0\u03ce\u03c2 \u03bd\u03b1 \u03ba\u03c5\u03b2\u03b5\u03c1\u03bd\u03ae\u03c3\u03c9 \u03c4\u03bf \u03a3\u03cd\u03bc\u03c0\u03b1\u03bd. \u0393\u03b9\u03b1\u03c4\u03af \u03bd\u03b1 \u03c4\u03c1\u03ad\u03c7\u03c9 \u03c0\u03af\u03c3\u03c9 \u03b1\u03c0\u03cc \u03ad\u03bd\u03b1 \u03b5\u03ba\u03b1\u03c4\u03bf\u03bc\u03bc\u03cd\u03c1\u03b9\u03bf;\u00bb<\/strong>. \u03a4\u03bf\u03bd \u039f\u03ba\u03c4\u03ce\u03b2\u03c1\u03b9\u03bf \u03c4\u03bf\u03c5 2009, \u03c3\u03c4\u03b7\u03bd \u0391\u03b3\u03af\u03b1 \u03a0\u03b5\u03c4\u03c1\u03bf\u03cd\u03c0\u03bf\u03bb\u03b7, \u03bf \u0393\u03ba\u03c1\u03af\u03c3\u03b1 \u03b1\u03c0\u03b1\u03bd\u03c4\u03ac \u03c3\u03c4\u03bf\u03bd \u03c0\u03c1\u03cc\u03b5\u03b4\u03c1\u03bf \u03c4\u03b7\u03c2 \u03b5\u03c0\u03b9\u03c4\u03c1\u03bf\u03c0\u03ae\u03c2 \u03c4\u03bf\u03c5 \u0399\u03bd\u03c3\u03c4\u03b9\u03c4\u03bf\u03cd\u03c4\u03bf\u03c5 Clay \u03c0\u03bf\u03c5 \u03b6\u03ae\u03c4\u03b7\u03c3\u03b5 \u03bd\u03b1 \u03c4\u03bf\u03bd \u03b4\u03b5\u03b9: \u00ab\u0397 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\u03ba\u03b9\u03bd\u03b7\u03c4\u03cc \u03c4\u03bf\u03c5 \u03c4\u03b7\u03bb\u03ad\u03c6\u03c9\u03bd\u03bf \u03b3\u03b9\u03b1 \u03c3\u03c5\u03bd\u03ad\u03bd\u03c4\u03b5\u03c5\u03be\u03b7, \u03bf \u03b9\u03b4\u03b9\u03cc\u03c1\u03c1\u03c5\u03b8\u03bc\u03bf\u03c2 \u03b5\u03c0\u03b9\u03c3\u03c4\u03ae\u03bc\u03bf\u03bd\u03b1\u03c2 \u03c4\u03bf\u03c5 \u03b6\u03ae\u03c4\u03b7\u03c3\u03b5 \u03bd\u03b1 \u03bc\u03b7\u03bd \u03c4\u03bf\u03bd \u03b5\u03bd\u03bf\u03c7\u03bb\u03b5\u03af \u03b3\u03b9\u03b1\u03c4\u03af \u03b5\u03ba\u03b5\u03af\u03bd\u03b7 \u03c4\u03b7\u03bd \u03ce\u03c1\u03b1 \u03bc\u03ac\u03b6\u03b5\u03c5\u03b5 \u03bc\u03b1\u03bd\u03b9\u03c4\u03ac\u03c1\u03b9\u03b1.<\/p>\n<p><strong>\u039c\u03ae\u03c0\u03c9\u03c2 \u03ad\u03bd\u03b1\u03c2 \u03b1\u03c0\u03cc \u03c4\u03bf\u03c5\u03c2 \u03b5\u03be\u03c5\u03c0\u03bd\u03cc\u03c4\u03b5\u03c1\u03bf\u03c5\u03c2 \u03b1\u03bd\u03b8\u03c1\u03ce\u03c0\u03bf\u03c5\u03c2 \u03c4\u03bf\u03c5 \u03c0\u03bb\u03b1\u03bd\u03ae\u03c4\u03b7 \u03ad\u03c7\u03b5\u03b9 \u03b2\u03c1\u03b5\u03b9 \u03c4\u03b7 \u00ab\u03c3\u03c5\u03bd\u03c4\u03b1\u03b3\u03ae\u00bb \u03c4\u03b7\u03c2 \u03b5\u03c5\u03c4\u03c5\u03c7\u03af\u03b1\u03c2 \u03c0\u03ad\u03c1\u03b1 \u03ba\u03b1\u03b9 \u03c0\u03ac\u03bd\u03c9 \u03b1\u03c0\u03cc \u03c4\u03bf \u03c7\u03c1\u03ae\u03bc\u03b1 \u03ba\u03b1\u03b9 \u03c4\u03b7 \u03b4\u03cc\u03be\u03b1;<\/strong><\/p><\/blockquote>\n<div class=\"fluid-width-video-wrapper\"><iframe id=\"fitvid203224\" src=\"https:\/\/www.youtube.com\/embed\/Ng1W2KUHI2s?feature=oembed\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\" data-mce-fragment=\"1\"><\/iframe><\/div>\n<p><!--more--><\/p>\n<h4><\/h4>\n<p><a href=\"https:\/\/www.hea.edu.gr\/o-megalofyis-kyrios-perelman-i-ikasia-tou-poincare\/?fbclid=IwAR1uMKKJgrSvBktVCkMAYMj6byXdKJO8Jr65fOOSsyRckG1Bxc3V2918tK0\">\u03c0\u03b7\u03b3\u03ae<\/a><\/p>\n<div class=\"post-sharing\"><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"footnotes":"","_jetpack_memberships_contains_paid_content":false,"jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[33,15],"tags":[],"jetpack_publicize_connections":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u039f \u03bc\u03b5\u03b3\u03b1\u03bb\u03bf\u03c6\u03c5\u03ae\u03c2 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