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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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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Why was the ant so confused?

Because all his uncles were "ants"!
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What kind of cats like to go bowling?

Alley cats.
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Where are sharks from?

Finland.
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What's the name of the archeologist that works at Scotland Yard?

Sherlock Bones.
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Why do cows wear bells?

Because their horns don't work.

There were two cows in a field. The first cow said "moo" and the second cow said "baaaa." The first cow asked the second cow, "why did you say baaaa?" The second cow said, "I'm learning a foreign language."
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I tried nutella on some salmon

got salmonella.
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What is a cat's favorite movie?

The sound of Mew-sic
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Where do cows go on Saturday night?

To the mooooooovies.
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