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's the difference between a lawyer and a prostitute?

A prostitute will stop screwing you when you're dead.
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How many Cabbage Patch dolls does it take to change a light bulb?

The question is irrelevant, since you couldn't find the dolls even if you knew how many. (Note: Well, this was a good joke in 1983-84. . . .)
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What did Michael Jackson tell the little boy?

"The way you make me feel, it really turns me on!"
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What did one volcano say to the other?

I lava you.
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What do you get when you cross a Christmas tree with an apple?

A pineapple!
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Why did the cow cross the road?

Because the chicken was on vacation.
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If minorities have the race card and women have the gender card, what do rednecks have?

The Trump Card
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What kind of music do planets sing?

Neptunes!
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Went to the corner shop -

bought 4 corners.

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