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 the world's longest punctuation mark?

The hundred yard dash.
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What did the laywer name his daughter?

Sue.
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Who makes dinosaur clothes?

A dino-sewer.
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How many Bluegrass musicians does it take to screw in a light bulb??

What's a light bulb?
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"My therapist says I have a preoccupation with vengeance.

We'll see about that."

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What do you do if your dog chews a dictionary?

Take the words out of his mouth
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One is really heavy, the other is a little lighter.
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Why does a giraffe have such a long neck?

Because his feet stink
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What bird can lift the most?

A crane.
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