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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How did the bubble gum cross the road?

On the bottom of the chicken's foot!
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Which is the most religious cheese?

Emmental...it's very hol(e)y...
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What has a head but no body?

A nail.
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How many Christians does it take to change a light bulb?

Three, but they're really only one.
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What is the chemical formula for "banana"?

BaNa2
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What do you call a Mexican who has lost his car?

Carlos.
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I wouldn't buy anything with velcro.

It's a total rip-off.
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What has 6 eyes but can't see?

3 blind mice.
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What time is it when 5 dogs chase 1 cat?

Five after one.
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