{"id":1740,"date":"2026-04-28T15:59:07","date_gmt":"2026-04-28T12:59:07","guid":{"rendered":"http:\/\/omathimatikos.gr\/ekete\/?p=1740"},"modified":"2026-05-08T09:15:41","modified_gmt":"2026-05-08T06:15:41","slug":"%cf%84%ce%bf-15%ce%bf-%ce%b3%cf%85%ce%bc%ce%bd%ce%ac%cf%83%ce%b9%ce%bf-%ce%bb%ce%ac%cf%81%ce%b9%cf%83%ce%b1%cf%82-%cf%85%cf%80%ce%bf%ce%b4%ce%ad%cf%87%ce%b8%ce%b7%ce%ba%ce%b5-%cf%84%ce%bf-6%ce%bf","status":"publish","type":"post","link":"https:\/\/omathimatikos.gr\/ekete\/?p=1740","title":{"rendered":"\u039c\u03b1\u03b8\u03b7\u03bc\u03b1\u03c4\u03b9\u03ba\u03ac \u03c3\u03c4\u03b7\u03bd \u03c0\u03c1\u03ac\u03be\u03b7: \u03a4\u03bf 15\u03bf \u0393\u03c5\u03bc\u03bd\u03ac\u03c3\u03b9\u03bf \u039b\u03ac\u03c1\u03b9\u03c3\u03b1\u03c2 \u03b3\u03b9\u03bf\u03c1\u03c4\u03ac\u03b6\u03b5\u03b9 \u03c4\u03bf 6\u03bf \u03a0\u03b1\u03bd\u03b5\u03bb\u03bb\u03ae\u03bd\u03b9\u03bf \u039c\u03b1\u03b8\u03b7(\u03bc\u03b1)\u03c4\u03b9\u03ba\u03cc \u03a6\u03b5\u03c3\u03c4\u03b9\u03b2\u03ac\u03bb"},"content":{"rendered":"<p><!--more--><\/p>\n<p data-path-to-node=\"5\">\u039c\u03b5 \u03b9\u03b4\u03b9\u03b1\u03af\u03c4\u03b5\u03c1\u03b7 \u03bb\u03b1\u03bc\u03c0\u03c1\u03cc\u03c4\u03b7\u03c4\u03b1 \u03ba\u03b1\u03b9 \u03b5\u03c0\u03b9\u03c4\u03c5\u03c7\u03af\u03b1 \u03c4\u03bf <b data-path-to-node=\"5\" data-index-in-node=\"40\">15\u03bf \u0393\u03c5\u03bc\u03bd\u03ac\u03c3\u03b9\u03bf \u039b\u03ac\u03c1\u03b9\u03c3\u03b1\u03c2<\/b> \u03c6\u03b9\u03bb\u03bf\u03be\u03ad\u03bd\u03b7\u03c3\u03b5 \u03c3\u03ae\u03bc\u03b5\u03c1\u03b1 \u03c4\u03b7\u03bd \u03b5\u03ba\u03b4\u03ae\u03bb\u03c9\u03c3\u03b7 \u03c4\u03bf\u03c5 <b data-path-to-node=\"5\" data-index-in-node=\"96\">6\u03bf\u03c5 \u03a0\u03b1\u03bd\u03b5\u03bb\u03bb\u03ae\u03bd\u03b9\u03bf\u03c5 \u039c\u03b1\u03b8\u03b7\u03c4\u03b9\u03ba\u03bf\u03cd \u039c\u03b1\u03b8\u03b7\u03bc\u03b1\u03c4\u03b9\u03ba\u03bf\u03cd \u03a6\u03b5\u03c3\u03c4\u03b9\u03b2\u03ac\u03bb<\/b>. \u03a4\u03bf \u03c3\u03c7\u03bf\u03bb\u03b5\u03af\u03bf \u03bc\u03b5\u03c4\u03b1\u03c4\u03c1\u03ac\u03c0\u03b7\u03ba\u03b5 \u03c3\u03b5 \u03ad\u03bd\u03b1\u03bd \u03b6\u03c9\u03bd\u03c4\u03b1\u03bd\u03cc \u03c7\u03ce\u03c1\u03bf \u03b4\u03b7\u03bc\u03b9\u03bf\u03c5\u03c1\u03b3\u03af\u03b1\u03c2, \u03cc\u03c0\u03bf\u03c5 \u03bf\u03b9 \u03bc\u03b1\u03b8\u03b7\u03c4\u03ad\u03c2 \u03b5\u03af\u03c7\u03b1\u03bd \u03c4\u03b7\u03bd \u03b5\u03c5\u03ba\u03b1\u03b9\u03c1\u03af\u03b1 \u03bd\u03b1 \u03c0\u03c1\u03bf\u03c3\u03b5\u03b3\u03b3\u03af\u03c3\u03bf\u03c5\u03bd \u03c4\u03b1 \u039c\u03b1\u03b8\u03b7\u03bc\u03b1\u03c4\u03b9\u03ba\u03ac \u03bc\u03ad\u03c3\u03b1 \u03b1\u03c0\u03cc \u03c0\u03c1\u03c9\u03c4\u03cc\u03c4\u03c5\u03c0\u03b5\u03c2 \u03ba\u03b1\u03b9 \u03b2\u03b9\u03c9\u03bc\u03b1\u03c4\u03b9\u03ba\u03ad\u03c2 \u03b4\u03c1\u03ac\u03c3\u03b5\u03b9\u03c2.<\/p>\n<p data-path-to-node=\"6\">\u03a4\u03b7\u03bd \u03ad\u03bd\u03b1\u03c1\u03be\u03b7 \u03c4\u03b7\u03c2 \u03b5\u03ba\u03b4\u03ae\u03bb\u03c9\u03c3\u03b7\u03c2 \u03c0\u03c1\u03b1\u03b3\u03bc\u03b1\u03c4\u03bf\u03c0\u03bf\u03af\u03b7\u03c3\u03b5 \u03bf \u0394\u03b9\u03b5\u03c5\u03b8\u03c5\u03bd\u03c4\u03ae\u03c2 \u03c4\u03bf\u03c5 15\u03bf\u03c5 \u0393\u03c5\u03bc\u03bd\u03b1\u03c3\u03af\u03bf\u03c5, <b data-path-to-node=\"6\" data-index-in-node=\"73\">\u03ba. \u039c\u03b9\u03c7\u03ac\u03bb\u03b7 \u0396\u03ac\u03c7\u03bf\u03c2<\/b>, \u03bf \u03bf\u03c0\u03bf\u03af\u03bf\u03c2 \u03ba\u03b1\u03bb\u03c9\u03c3\u03cc\u03c1\u03b9\u03c3\u03b5 \u03c4\u03bf\u03c5\u03c2 \u03c0\u03c1\u03bf\u03c3\u03ba\u03b5\u03ba\u03bb\u03b7\u03bc\u03ad\u03bd\u03bf\u03c5\u03c2 \u03ba\u03b1\u03b9 \u03c4\u03bf\u03c5\u03c2 \u03bc\u03b1\u03b8\u03b7\u03c4\u03ad\u03c2, \u03c4\u03bf\u03bd\u03af\u03b6\u03bf\u03bd\u03c4\u03b1\u03c2 \u03c4\u03b7 \u03c3\u03b7\u03bc\u03b1\u03c3\u03af\u03b1 \u03c4\u03b7\u03c2 \u03b5\u03be\u03c9\u03c3\u03c4\u03c1\u03ad\u03c6\u03b5\u03b9\u03b1\u03c2 \u03c4\u03bf\u03c5 \u03c3\u03c7\u03bf\u03bb\u03b5\u03af\u03bf\u03c5 \u03ba\u03b1\u03b9 \u03c4\u03b7 \u03c3\u03c4\u03ae\u03c1\u03b9\u03be\u03b7 \u03c3\u03b5 \u03ba\u03b1\u03b9\u03bd\u03bf\u03c4\u03cc\u03bc\u03b5\u03c2 \u03b5\u03ba\u03c0\u03b1\u03b9\u03b4\u03b5\u03c5\u03c4\u03b9\u03ba\u03ad\u03c2 \u03b4\u03c1\u03ac\u03c3\u03b5\u03b9\u03c2 \u03c0\u03bf\u03c5 \u03c0\u03c1\u03bf\u03ac\u03b3\u03bf\u03c5\u03bd \u03c4\u03b7 \u03b3\u03bd\u03ce\u03c3\u03b7.<\/p>\n<p data-path-to-node=\"7\">\u03a3\u03c4\u03b7 \u03c3\u03c5\u03bd\u03ad\u03c7\u03b5\u03b9\u03b1, \u03bf \u03a0\u03c1\u03cc\u03b5\u03b4\u03c1\u03bf\u03c2 \u03c4\u03bf\u03c5 \u0395\u03bb\u03bb\u03b7\u03bd\u03b9\u03ba\u03bf\u03cd \u039a\u03ad\u03bd\u03c4\u03c1\u03bf\u03c5 \u0395\u03c0\u03b9\u03c3\u03c4\u03b7\u03bc\u03ce\u03bd \u03ba\u03b1\u03b9 \u03a4\u03b5\u03c7\u03bd\u03ce\u03bd (\u0395.\u039a.\u0395.\u03a4\u0395.) \u03ba\u03b1\u03b9 \u03a3\u03cd\u03bc\u03b2\u03bf\u03c5\u03bb\u03bf\u03c2 \u0395\u03ba\u03c0\u03b1\u03af\u03b4\u03b5\u03c5\u03c3\u03b7\u03c2 \u039c\u03b1\u03b8\u03b7\u03bc\u03b1\u03c4\u03b9\u03ba\u03ce\u03bd, <b data-path-to-node=\"7\" data-index-in-node=\"119\">\u03ba. \u039a\u03c9\u03bd\u03c3\u03c4\u03b1\u03bd\u03c4\u03af\u03bd\u03bf\u03c2 \u039c\u03c0\u03bf\u03c5\u03c1\u03b1\u03b6\u03ac\u03bd\u03b1\u03c2<\/b>, \u03b1\u03bd\u03ad\u03b4\u03b5\u03b9\u03be\u03b5 \u03c4\u03b7\u03bd \u03b1\u03bd\u03b1\u03b3\u03ba\u03b1\u03b9\u03cc\u03c4\u03b7\u03c4\u03b1 \u03c4\u03c9\u03bd \u039c\u03b1\u03b8\u03b7\u03bc\u03b1\u03c4\u03b9\u03ba\u03ce\u03bd \u03c3\u03c4\u03b7\u03bd \u03ba\u03b1\u03b8\u03b7\u03bc\u03b5\u03c1\u03b9\u03bd\u03ae \u03b6\u03c9\u03ae. \u039c\u03b5 \u03c0\u03b1\u03c1\u03b1\u03c3\u03c4\u03b1\u03c4\u03b9\u03ba\u03cc \u03c4\u03c1\u03cc\u03c0\u03bf \u03ba\u03b1\u03b9 \u03b6\u03c9\u03bd\u03c4\u03b1\u03bd\u03ac \u03c0\u03b1\u03c1\u03b1\u03b4\u03b5\u03af\u03b3\u03bc\u03b1\u03c4\u03b1, \u03b5\u03be\u03ae\u03b3\u03b7\u03c3\u03b5 \u03c0\u03ce\u03c2 \u03b7 \u03bc\u03b1\u03b8\u03b7\u03bc\u03b1\u03c4\u03b9\u03ba\u03ae \u03c3\u03ba\u03ad\u03c8\u03b7 \u03b1\u03c0\u03bf\u03c4\u03b5\u03bb\u03b5\u03af \u03c4\u03bf \u00ab\u03ba\u03bb\u03b5\u03b9\u03b4\u03af\u00bb \u03b3\u03b9\u03b1 \u03c4\u03b7\u03bd \u03ba\u03b1\u03c4\u03b1\u03bd\u03cc\u03b7\u03c3\u03b7 \u03c4\u03bf\u03c5 \u03ba\u03cc\u03c3\u03bc\u03bf\u03c5 \u03bc\u03b1\u03c2.<\/p>\n<p data-path-to-node=\"8\">\u03a4\u03bf \u03c0\u03c1\u03cc\u03b3\u03c1\u03b1\u03bc\u03bc\u03b1 \u03c3\u03c5\u03bd\u03b5\u03c7\u03af\u03c3\u03c4\u03b7\u03ba\u03b5 \u03bc\u03b5 \u03c4\u03bf \u03ba\u03b1\u03c4\u03b1\u03c0\u03bb\u03b7\u03ba\u03c4\u03b9\u03ba\u03cc \u03b8\u03b5\u03b1\u03c4\u03c1\u03b9\u03ba\u03cc \u03b4\u03c1\u03ce\u03bc\u03b5\u03bd\u03bf <b data-path-to-node=\"8\" data-index-in-node=\"61\">\u00ab\u039f \u039a\u03b1\u03c5\u03b3\u03ac\u03c2 \u03c4\u03c9\u03bd \u039c\u03b1\u03b8\u03b7\u03bc\u03b1\u03c4\u03b9\u03ba\u03ce\u03bd\u00bb<\/b>, \u03c4\u03bf \u03bf\u03c0\u03bf\u03af\u03bf \u03c0\u03b1\u03c1\u03bf\u03c5\u03c3\u03af\u03b1\u03c3\u03b5 \u03bf\u03bc\u03ac\u03b4\u03b1 \u03bc\u03b1\u03b8\u03b7\u03c4\u03ce\u03bd \u03c4\u03bf\u03c5 <b data-path-to-node=\"8\" data-index-in-node=\"127\">12\u03bf\u03c5 \u0393\u03b5\u03bd\u03b9\u03ba\u03bf\u03cd \u039b\u03c5\u03ba\u03b5\u03af\u03bf\u03c5 \u039b\u03ac\u03c1\u03b9\u03c3\u03b1\u03c2<\/b>, \u03c5\u03c0\u03cc \u03c4\u03b7\u03bd \u03b5\u03c0\u03b9\u03bc\u03ad\u03bb\u03b5\u03b9\u03b1 \u03c4\u03bf\u03c5 \u03bc\u03b1\u03b8\u03b7\u03bc\u03b1\u03c4\u03b9\u03ba\u03bf\u03cd <b data-path-to-node=\"8\" data-index-in-node=\"191\">\u03ba. \u0393\u03b5\u03c9\u03c1\u03b3\u03af\u03bf\u03c5 \u039a\u03c9\u03c4\u03bf\u03cd\u03bb\u03b1<\/b> \u03ba\u03b1\u03b9 \u03c4\u03b7\u03c2 \u03c6\u03b9\u03bb\u03bf\u03bb\u03cc\u03b3\u03bf\u03c5 <b data-path-to-node=\"8\" data-index-in-node=\"229\">\u03ba. \u039c\u03b1\u03c1\u03af\u03b1\u03c2 \u03a4\u03c3\u03ac\u03c1\u03b1<\/b>. \u0397 \u03c0\u03b1\u03c1\u03ac\u03c3\u03c4\u03b1\u03c3\u03b7 \u03b5\u03bd\u03b8\u03bf\u03c5\u03c3\u03af\u03b1\u03c3\u03b5 \u03c4\u03bf\u03c5\u03c2 \u03bc\u03b1\u03b8\u03b7\u03c4\u03ad\u03c2 \u03c4\u03bf\u03c5 15\u03bf\u03c5 \u0393\u03c5\u03bc\u03bd\u03b1\u03c3\u03af\u03bf\u03c5, \u03c3\u03c5\u03bd\u03b4\u03ad\u03bf\u03bd\u03c4\u03b1\u03c2 \u03bc\u03bf\u03bd\u03b1\u03b4\u03b9\u03ba\u03ac \u03c4\u03b7\u03bd \u03b5\u03c0\u03b9\u03c3\u03c4\u03ae\u03bc\u03b7 \u03bc\u03b5 \u03c4\u03bf \u03b8\u03ad\u03b1\u03c4\u03c1\u03bf.<\/p>\n<p data-path-to-node=\"9\">\u0391\u03ba\u03bf\u03bb\u03bf\u03cd\u03b8\u03b7\u03c3\u03b5 \u03b7 <b data-path-to-node=\"9\" data-index-in-node=\"13\">\u03b2\u03c1\u03ac\u03b2\u03b5\u03c5\u03c3\u03b7 \u03c4\u03c9\u03bd \u03bc\u03b1\u03b8\u03b7\u03c4\u03ce\u03bd \u03c4\u03bf\u03c5 15\u03bf\u03c5 \u0393\u03c5\u03bc\u03bd\u03b1\u03c3\u03af\u03bf\u03c5<\/b> \u03c0\u03bf\u03c5 \u03b4\u03b9\u03b1\u03ba\u03c1\u03af\u03b8\u03b7\u03ba\u03b1\u03bd \u03c3\u03c4\u03b7 \u03b4\u03c1\u03ac\u03c3\u03b7 <b data-path-to-node=\"9\" data-index-in-node=\"79\">\u00ab\u03a4\u03bf \u039a\u03c5\u03bd\u03ae\u03b3\u03b9 \u03c4\u03bf\u03c5 \u03a7\u03b1\u03bc\u03ad\u03bd\u03bf\u03c5 \u0398\u03b7\u03c3\u03b1\u03c5\u03c1\u03bf\u03cd\u00bb<\/b>, \u03b7 \u03bf\u03c0\u03bf\u03af\u03b1 \u03b5\u03af\u03c7\u03b5 \u03c5\u03bb\u03bf\u03c0\u03bf\u03b9\u03b7\u03b8\u03b5\u03af \u03c3\u03c4\u03bf \u03c3\u03c7\u03bf\u03bb\u03b5\u03af\u03bf \u03c3\u03c4\u03b9\u03c2 2 \u0391\u03c0\u03c1\u03b9\u03bb\u03af\u03bf\u03c5 \u03bc\u03b5 \u03b1\u03c0\u03cc\u03bb\u03c5\u03c4\u03b7 \u03b5\u03c0\u03b9\u03c4\u03c5\u03c7\u03af\u03b1.<\/p>\n<p data-path-to-node=\"10\">\u03a3\u03b5 \u03ba\u03bb\u03af\u03bc\u03b1 \u03b9\u03b4\u03b9\u03b1\u03af\u03c4\u03b5\u03c1\u03b7\u03c2 \u03c3\u03c5\u03b3\u03ba\u03af\u03bd\u03b7\u03c3\u03b7\u03c2, \u03bf \u03ba. \u039a\u03c9\u03bd\u03c3\u03c4\u03b1\u03bd\u03c4\u03af\u03bd\u03bf\u03c2 \u039c\u03c0\u03bf\u03c5\u03c1\u03b1\u03b6\u03ac\u03bd\u03b1\u03c2 \u03b1\u03c0\u03ad\u03bd\u03b5\u03b9\u03bc\u03b5 <b data-path-to-node=\"10\" data-index-in-node=\"71\">\u03c4\u03b9\u03bc\u03b7\u03c4\u03b9\u03ba\u03ae \u03c0\u03bb\u03b1\u03ba\u03ad\u03c4\u03b1<\/b> \u03c3\u03c4\u03bf\u03bd \u0394\u03b9\u03b5\u03c5\u03b8\u03c5\u03bd\u03c4\u03ae \u03c4\u03bf\u03c5 \u03c3\u03c7\u03bf\u03bb\u03b5\u03af\u03bf\u03c5, <b data-path-to-node=\"10\" data-index-in-node=\"117\">\u03ba. \u039c\u03b9\u03c7\u03ac\u03bb\u03b7 \u0396\u03ac\u03c7\u03bf<\/b>, \u03b3\u03b9\u03b1 \u03c4\u03b7\u03bd \u03c0\u03bf\u03bb\u03c5\u03b5\u03c4\u03ae \u03ba\u03b1\u03b9 \u03c3\u03c0\u03bf\u03c5\u03b4\u03b1\u03af\u03b1 \u03c0\u03c1\u03bf\u03c3\u03c6\u03bf\u03c1\u03ac \u03c4\u03bf\u03c5 \u03c3\u03c4\u03b7\u03bd \u03b5\u03ba\u03c0\u03b1\u03af\u03b4\u03b5\u03c5\u03c3\u03b7. \u039f \u03ba. \u0396\u03ac\u03c7\u03bf\u03c2, \u03c0\u03b1\u03c1\u03b1\u03bb\u03b1\u03bc\u03b2\u03ac\u03bd\u03bf\u03bd\u03c4\u03b1\u03c2 \u03c4\u03b7\u03bd \u03c0\u03bb\u03b1\u03ba\u03ad\u03c4\u03b1, \u03b5\u03be\u03ad\u03c6\u03c1\u03b1\u03c3\u03b5 \u03c4\u03b9\u03c2 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\u03c3\u03c7\u03bf\u03bb\u03b5\u03af\u03bf\u03c5 \u03b3\u03b9\u03b1 \u03c4\u03b7 \u03b6\u03b5\u03c3\u03c4\u03ae \u03c4\u03bf\u03c5\u03c2 \u03c6\u03b9\u03bb\u03bf\u03be\u03b5\u03bd\u03af\u03b1 \u03ba\u03b1\u03b9 \u03c4\u03b7 \u03c3\u03c5\u03bc\u03bc\u03b5\u03c4\u03bf\u03c7\u03ae \u03c4\u03bf\u03c5\u03c2.<\/p>\n<p data-path-to-node=\"10\">\u03a4\u03bf \u0394\u03b9\u03bf\u03b9\u03ba\u03b7\u03c4\u03b9\u03ba\u03cc \u03a3\u03c5\u03bc\u03b2\u03bf\u03cd\u03bb\u03b9\u03bf \u03c4\u03bf\u03c5 \u0395.\u039a.\u0395.\u03a4\u0395. \u03b5\u03ba\u03c6\u03c1\u03ac\u03b6\u03b5\u03b9 \u03c4\u03b9\u03c2 \u03b8\u03b5\u03c1\u03bc\u03ad\u03c2 \u03c4\u03bf\u03c5 \u03b5\u03c5\u03c7\u03b1\u03c1\u03b9\u03c3\u03c4\u03af\u03b5\u03c2 \u03c3\u03c4\u03b7\u03bd\u00a0<strong>\u0388\u03bd\u03c9\u03c3\u03b7 \u0395\u03bb\u03bb\u03ae\u03bd\u03c9\u03bd \u0395\u03c6\u03bf\u03c0\u03bb\u03b9\u03c3\u03c4\u03ce\u03bd<\/strong>\u00a0\u03b3\u03b9\u03b1 \u03c4\u03b7\u03bd \u03c0\u03bf\u03bb\u03cd\u03c4\u03b9\u03bc\u03b7 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