Maths jokes!

[nibbler]

Not sure if you'll get this or not, more likely that not most of you will
Person 1: What's the integral of 1/cabin?
Person 2: A log cabin.
Person 1: No, a houseboat – you forgot to add the C!



Also:

http://www.chaosmatrix.org/library/humor/equation.html


And finally:

[kalniel]

It's woman = evil in the original

[nibbler]

There's a whole book of that kind of answers, can't remember what it's called