13 Apr
2011
13 Apr
'11
3:08 p.m.
Do you mean solutions of the following form? "A torus is shaped like a 0, and has an Euler characteristic of 0." Otherwise, it doesn't seem to make much sense, as EC() has a domain of topologies and a codomain of integers, which have no intersection. Or are you referring to another meaning of 'Euler characteristic', which I haven't heard of? Sincerely, Adam P. Goucher
PUZZLE: Let EC(X) denote the Euler characteristic of X.
Solve for X:
EC(X) = X
--Dan
P.S. Thanks to Evan O'Dorney for pointing out a case I had overlooked.
Sometimes the brain has a mind of its own.
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