{"id":616665,"date":"2026-01-18T18:09:36","date_gmt":"2026-01-18T17:09:36","guid":{"rendered":"https:\/\/cronologia-universale.it\/408\/"},"modified":"2026-01-18T18:09:36","modified_gmt":"2026-01-18T17:09:36","slug":"3rd-century-4","status":"publish","type":"post","link":"https:\/\/cronologia-universale.it\/en\/3rd-century-4\/","title":{"rendered":"3rd century"},"content":{"rendered":"<p>Pappos&#8217;s Theorem: With 9 lines and 9 points where the lines intersect, if all but one of the points are the intersection of three lines, then the last point is also the intersection of three lines. (With 10 lines and 10 points, the theorem is Desargues&#8217;s and was not proved until 1636.)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pappos&#8217;s Theorem: With 9 lines and 9 points where the lines intersect, if all but&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[43],"tags":[],"class_list":["post-616665","post","type-post","status-publish","format-standard","hentry","category-vg-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>3rd century - Cronologia Universale<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cronologia-universale.it\/en\/3rd-century-4\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"3rd century - 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