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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Why did the cow cross the road?

Because the chicken was on vacation.
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Why should you never tell a secret in a corn field?

Because there are too many ears.
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What do ghosts use to wash their hair?

Shamboo!
Frankenstein: Witch can you make me a lemonade?
Witch: Poof you are a lemonade!
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How many astronomers does it take to change a light bulb?

None. Astronomers prefer the dark.
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Where did the farmer take the pigs on Saturday afternoon?

He took them to a pignic.
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There are 10 kinds of people in the world.

Those who read binary and those who don't.
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How many lawyer jokes are there?

Only three. The rest are true stories.
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I’ve never gone to a gun range before.

I decided to give it a shot!
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What did Delaware?

A New Jersey.
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