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

``Oh wow, is it like dark, man?''
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How many polite New Yorkers does it take to screw in a light bulb?

Both of them.
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How many singers from Nashville does it take to change a light bulb?

Four. One to change it, one to sing about how heartbroken he is at the loss of the old one, one to sing about how madly in love he is with the new one, and one to go "Yee-Hah!" and throw his cowboy hat in the air.
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I tried water polo but my horse drowned.
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How did the egg cross the road?

It scrambled across!
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What did the carrot say to the rabbit?

Do you want to grab a bite?
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What did the policeman say when his tummy was rumbling?

Stop! You're under a vest.
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What are pirate's favoite treat?

Chips AHOY!!
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What do Santa's elves drink?

Minnesoda.
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