Q: How many mathematicians does it take to screw in a light bulb?
A: The solution is left to the reader as an exercise.

A mathematician is in Africa trying to capture a lion. When he spots one he proceeds to build a fence around himself and says, "I define this to be outside!"

Mathematics is made of 50 percent formulas, 50 percent proofs and 50 percent imagination.

What is the shortest mathematicians joke?
Let epsilon be smaller than zero.