{"id":23982,"date":"2020-07-04T12:16:01","date_gmt":"2020-07-04T16:16:01","guid":{"rendered":"https:\/\/blog.carlrobitaille.org\/?p=23982"},"modified":"2020-07-04T12:16:05","modified_gmt":"2020-07-04T16:16:05","slug":"evolution-of-the-notation-for-the-empty-set","status":"publish","type":"post","link":"https:\/\/blog.carlrobitaille.org\/?p=23982","title":{"rendered":"Evolution of the notation for the empty set"},"content":{"rendered":"\n<figure class=\"wp-block-embed-twitter wp-block-embed is-type-rich is-provider-twitter\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"twitter-tweet\" data-width=\"550\" data-dnt=\"true\"><p lang=\"en\" dir=\"ltr\">Evolution of the notation for the empty set:<br>0  &#8211; George Boole \ud83c\uddec\ud83c\udde7 (1847)<br>\ud835\udc42  &#8211; Georg Cantor \ud83c\udde9\ud83c\uddea (1880)<br>{}  &#8211; Gottlob Frege \ud83c\udde9\ud83c\uddea(1882)<br>\u039b  &#8211; Giuseppe Peano \ud83c\uddee\ud83c\uddf9 (1889)<br>\u2205  &#8211; Andre Weil \ud83c\uddeb\ud83c\uddf7 (1939)<\/p>&mdash; Fermat&#39;s Library (@fermatslibrary) <a href=\"https:\/\/twitter.com\/fermatslibrary\/status\/1279410922570858497?ref_src=twsrc%5Etfw\">July 4, 2020<\/a><\/blockquote><script async src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script>\n<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,19],"tags":[],"class_list":["post-23982","post","type-post","status-publish","format-standard","hentry","category-histoire","category-mathematiques"],"_links":{"self":[{"href":"https:\/\/blog.carlrobitaille.org\/index.php?rest_route=\/wp\/v2\/posts\/23982","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.carlrobitaille.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.carlrobitaille.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.carlrobitaille.org\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.carlrobitaille.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=23982"}],"version-history":[{"count":1,"href":"https:\/\/blog.carlrobitaille.org\/index.php?rest_route=\/wp\/v2\/posts\/23982\/revisions"}],"predecessor-version":[{"id":23983,"href":"https:\/\/blog.carlrobitaille.org\/index.php?rest_route=\/wp\/v2\/posts\/23982\/revisions\/23983"}],"wp:attachment":[{"href":"https:\/\/blog.carlrobitaille.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=23982"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.carlrobitaille.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=23982"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.carlrobitaille.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=23982"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}