How many mathematicians does it take to screw in a light bulb?

One. He gives it to six Californians, thereby reducing the problem to an earlier joke...

In earlier work, Wiener [1] has shown that one mathematician can change a light bulb.

If k mathematicians can change a light bulb, and if one more simply watches them do it, then k+1 mathematicians will have changed the light bulb.

Therefore, by induction, for all n in the positive integers, n mathematicians can change a light bulb.

Bibliography:

[1] Wiener, Matthew P., <11485@ucbvax>, Re: YALBJ, 1986
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What do you call a fish without an eye?

Fsh
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How do you know the economy is only getting worse?

On the latest episode of "Celebrity Apprentice", Donald Trump fired himself!
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How does an Eskimo stick his house together?

With igloo!
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Why is a skeleton so mean?

He doesn't have a heart.
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What do you call an elephant in a phone booth?

Stuck
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A group of chess enthusiasts checked into a hotel and were standing in the lobby discussing their recent tournament victories. After about an hour, the manager came out of the office and asked them to disperse. "But why?" they asked, as they moved off.

"because," he said "I can't stand chess nuts boasting in an open foyer."
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How is Donald Trump going to shut down the Department of Education?

By renaming it Trump University.
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What's round and bad-tempered?

A vicious circle.
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What do frogs order when they go to a restaurant?

French Flies.
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