**Question:** How many numerical analysts does it take to change a light bulb?
**Answer:** 3.9967 (after six iterations).

**Question:** How many mathematical logicians does it take to change a light bulb?
**Answer:** None. They can't do it, but they can easily prove that it can be done.

**Question:** How many classical geometers does it take to change a light bulb?
**Answer:** None. You can't do it with a straight edge and a compass.

**Question:** How many math analysts does it take to change a light bulb?
**Answer:** Three. One to prove existence, one to prove uniqueness and one to derive a nonconstructive algorithm to do it.

**Question:** How many number theorists does it take to change a light bulb?
**Answer:** I don't know the exact number, but I am sure it must be some rather elegant prime.

**Question:** How many statisticians does it take to screw in a light bulb?
**Answer:** 1 to 3, alpha = .05

**Question:** How many math students does it take to change a light bulb?
**Answer:** Ten. One to do it and nine to watch.

**Question:**How many topologists does it take to change a light bulb?
**Answer:** Just one. But what will you do with the doughnut?

**Question:** How many research mathematicians does it take change a light bulb?
**Answer:** One. With eight research students, two programmers, three post-docs and a secretary to help.

**Question:** How many tenure-track professors does it take to change a light bulb?
**Answer:** Four. One to do it and three to co-author the paper.

**Question:** How many graduate students does it take to change a light bulb?
**Answer:** Only one. But it takes nine years.

**Question:** How many math department administrators does it take to change a light bulb?
**Answer:** None. What was wrong with the old one?

Source: *Somebody who thought these were funny!*