From: Vaughan Pratt <pratt@cs.stanford.edu>
To: categories <categories@mta.ca>
Subject: Re: Illusion and Forthrightness in Wikipedia
Date: Mon, 13 Sep 2010 01:42:52 -0700 [thread overview]
Message-ID: <E1OvDlk-0000FE-Vo@mlist.mta.ca> (raw)
In-Reply-To: <730oimakP9232S03.1284336675@web03.cms.usa.net>
Incidentally the following postscript program produces the trefoil at
http://boole.stanford.edu/Trefoil.jpg
=====clip here========
%!PS
/step {
.01 exch 1 1 1 setrgbcolor 0 setlinewidth
{/t exch def
/r 4 3 t mul cos sub def
2 t mul sin r mul t sin 3 mul sub
2 t mul cos r mul t cos 3 mul add
lineto currentpoint stroke moveto
t 360 div 1 1 sethsbcolor 2 setlinewidth} for
} def
36 36 scale 8.5 11 translate
0 0 moveto 0 360 step
1 -1 moveto 60 80 step
showpage
=====clip here=======
[For admin and other information see: http://www.mta.ca/~cat-dist/ ]
next prev parent reply other threads:[~2010-09-13 8:42 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-13 0:11 Fred E.J. Linton
2010-09-13 6:23 ` Vaughan Pratt
2010-09-13 8:42 ` Vaughan Pratt [this message]
2010-09-13 18:32 ` Mike Stay
2010-09-13 19:02 ` Timothy Porter
2010-09-14 16:54 ` Vaughan Pratt
2010-09-13 22:02 ` Toby Bartels
2010-09-14 7:46 John Baez
2010-09-18 6:58 Fred E.J. Linton
2010-09-19 22:07 ` Vaughan Pratt
[not found] <474oiRg647312S02.1284793135@web02.cms.usa.net>
2010-09-18 7:26 ` John Baez
2010-09-19 23:38 Fred E.J. Linton
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