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 do ducks fly south?

Because it's too far to walk!
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Where does an elephant pack his luggage?

In his trunk
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Why don't aliens celebrate Chistmas?

Because they don't want to give away their presence.
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What has four wheels and flies?

A garbage truck.
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What do you call the king of vegetables?

Elvis Parsley.
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What emotional disorder does a gas chromatograph suffer from?

Separation anxiety.
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What did Delaware?

A New Jersey.
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Why are kindergarten teachers so good?

They can make little things count.
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What do you call a mad elephant?

An earthquake.
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