http://www.math.ualberta.ca/~runde/jokes.html Some of these are pretty funny -Herr-
A carpool is a group of people who commute with each other. Therefore, a carpool is an Abelian group. -Kyle-
What do you call someone who's afraid of abstract albegra?
Homomorphicphobic
An infinite crowd of mathematicians enters a bar.
The first one orders a pint, the second one a half pint, the third one a quarter pint...
"I understand", says the bartender - and pours two pints.
Q: Why do mathematicians, after a dinner at a Chinese restaurant, always insist on taking the leftovers home?
A: Because they know the Chinese remainder theorem!
Q: What does a mathematician present to his fiancée when he wants to propose?
A: A polynomial ring!