maths problem

Who was the mathematician that says, "If exactly one person enters that house, it will be empty"?

Q: What did the zero say to the eight?
A: Nice belt...

Q: How many mathematicians does it take to change a light bulb?
A: One: He gives it to three physicists, thus reducing it to a problem that has already been solved.

Q: Why don't jokes work in octal?
A: Because 7 10 11.

Source:

1. http://www.businessinsider.com/13-math-jokes-that-every-mathematician-fi...
2. https://www.reddit.com/r/math/comments/qwq1u/in_honor_of_pi_day_what_is_...