13 Apr
2011
13 Apr
'11
3:08 p.m.
On Wed, Apr 13, 2011 at 12:59 PM, Dan Asimov <dasimov@earthlink.net> wrote:
PUZZLE: Let EC(X) denote the Euler characteristic of X.
Solve for X:
EC(X) = X
--Dan
The Euler characteristic is a number, whereas X is at least a set. Can you clarify? -- Mike Stay - metaweta@gmail.com http://www.cs.auckland.ac.nz/~mike http://reperiendi.wordpress.com