f(x) ≠ g(x)
g(x) = 1/f(x)
g(f(x)) = 1/f(g(x))
for all x in the respective domains.
I suppose I ignored constant functions as solutions. Your solutions are good. Are there more interesting ones?
blackjack
<a href="http://c.casalemedia.com/c?s=51816&f=3&id=0" target="_blank"><img src="http://as.casalemedia.com/s?s=51816&u=http://perplexus.info&f=3&id=0&if=0" width="120" height="600" border="0"></a>
flooble's webmaster puzzle
re: Family Plan (spoiler?)
