Explain xkcd

Date: May 25th, 2011
From: Dan Hoey
Subject: Extended Mind

Shishir wrote:

  You hit an infinite loop from
  http://en.wikipedia.org/wiki/Mathematics.  And yes I know, I have
  not hit anything in italics or parenthesis.  It takes just 3 clicks
  to get back to Mathematics :)

Wrong.

See above:  mathematics -> quantity -> property -> modern philosophy
-> philosophy .