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 element is a girl's future best friend?

Carbon.
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Why are there fences around a graveyard?

Because people are dying to get in!
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How do you know when the moon has enough to eat?

When it's full.
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What do you call a rabbit with beetles all over it?

Bugs Bunny.
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What is the opposite of a restaurant?

A workaraunt.
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What kind of underwear to reporters wear?

News briefs.
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What's black and white and red all over?

A newspaper!
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What is the best thing to do if you find a gorilla in your bed?

Sleep somewhere else.
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How many folk musicians does it take to change a light bulb?

Seven. One to change it and the other six to sing about how good the old one was.
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