{"id":308,"date":"2002-09-20T05:16:25","date_gmt":"2002-09-20T19:16:25","guid":{"rendered":"http:\/\/www.andrewjohnson.me.uk\/blog\/?p=308"},"modified":"2002-09-20T05:16:25","modified_gmt":"2002-09-20T19:16:25","slug":"maths-misc","status":"publish","type":"post","link":"https:\/\/andyjohnson.uk\/blog\/2002\/09\/20\/maths-misc\/","title":{"rendered":"Maths, misc."},"content":{"rendered":"<p>Been nosing around a few maths and physics sites today&#8230;<\/p>\n<p>I first read <a href=\"http:\/\/www.amazon.co.uk\/exec\/obidos\/ASIN\/0140289208\/026-5029517-3717250\">Godel, Escher, Bach<\/a>&nbsp;at the age of&nbsp;about twelve&nbsp;when I borrowed it from the library back in Hull. I didn&#8217;t understand much of it at that age, but G?del&#8217;s Incompleteness Theorem blew my mind. It still does. There&#8217;s&nbsp;a whole load of <a href=\"http:\/\/www.miskatonic.org\/godel.html\">explanations<\/a>, in English, of&nbsp;this deciptively simple theorem. I prefer the one by Rudy Rucker &#8211; somewere, I&#8217;ve got a copy of <a href=\"http:\/\/www.amazon.co.uk\/exec\/obidos\/ASIN\/0140262954\/026-5029517-3717250\">Infinity and the Mind<\/a>&nbsp;that I haven&#8217;t read it for at least&nbsp;ten years.<\/p>\n<p>I like the idea of <a href=\"http:\/\/www.ics.uci.edu\/~eppstein\/junkyard\/penrose.html\">Penrose Tiles<\/a> &#8211; you can tile an infinite surface without the tile pattern ever repeating. You can play with Penrise tiles using <a href=\"http:\/\/www.geocities.com\/SiliconValley\/Pines\/1684\/Penrose.html\">this<\/a> rather smart&nbsp;Java applet. There&#8217;s an&nbsp;interesting site about the <a href=\"http:\/\/www2.spsu.edu\/math\/tile\/index.htm\">mathematics and history of tiling<\/a>: the <a href=\"http:\/\/www2.spsu.edu\/math\/tile\/symm\/ident17.htm\">galleries<\/a> showing&nbsp;the&nbsp;full set of&nbsp;plane symetry groups are very beautiful.<\/p>\n<p>Now&nbsp;goggle your eyes at&nbsp;the Penrose&nbsp;<a href=\"http:\/\/hades.ph.tn.tudelft.nl\/Internal\/PHServices\/Documentation\/MathWorld\/math\/math\/t\/t317.htm\">Tribar<\/a>.<\/p>\n<p><a href=\"http:\/\/www.damtp.cam.ac.uk\/user\/gr\/public\/qg_ss.html\">M-theory<\/a> is a kind of generalisation of Superstring Theory, which is itself what we gor when someone added extra dimensions to the old idea of String theory (<em>sooo Eighties, darling<\/em>). <a href=\"http:\/\/www.netspace.net.au\/~gregegan\/\">Greg&nbsp; Egan<\/a>&#8216;s book<a href=\"http:\/\/www.amazon.co.uk\/exec\/obidos\/ASIN\/0752809253\/qid%3D1032524050\/026-5029517-3717250\">Diaspora<\/a> uses this type of physics to make possible a very complex plot. Recommended if you like hard SF.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Been nosing around a few maths and physics sites today&#8230; I first read Godel, Escher, Bach&nbsp;at the age of&nbsp;about twelve&nbsp;when I borrowed it from the library back in Hull. I didn&#8217;t understand much of it at that age, but G?del&#8217;s Incompleteness Theorem blew my mind. It still does. There&#8217;s&nbsp;a whole load of explanations, in English, &hellip; <a href=\"https:\/\/andyjohnson.uk\/blog\/2002\/09\/20\/maths-misc\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Maths, misc.&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"class_list":["post-308","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/andyjohnson.uk\/blog\/wp-json\/wp\/v2\/posts\/308","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/andyjohnson.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/andyjohnson.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/andyjohnson.uk\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/andyjohnson.uk\/blog\/wp-json\/wp\/v2\/comments?post=308"}],"version-history":[{"count":0,"href":"https:\/\/andyjohnson.uk\/blog\/wp-json\/wp\/v2\/posts\/308\/revisions"}],"wp:attachment":[{"href":"https:\/\/andyjohnson.uk\/blog\/wp-json\/wp\/v2\/media?parent=308"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/andyjohnson.uk\/blog\/wp-json\/wp\/v2\/categories?post=308"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/andyjohnson.uk\/blog\/wp-json\/wp\/v2\/tags?post=308"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}