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 is as big as an elephant but weighs nothing?

Its shadow
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How do you keep a skunk from smelling?

Plug its nose.
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Why do cows go to New York?

To see the moosicals
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What's gray, eats fish, and lives in Washington, D.C.?

The Presidential Seal.
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What did one egg say to the other egg?

Let's get crackin!
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Why would an elephant paint its toenails different colors?

To hide in a bag of M&M's.
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What did the scientist say when he found 2 isotopes of helium?

HeHe
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Why couldn't the pirates play cards?

They were sitting on the deck!
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Which reindeer likes to clean?

Comet
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