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 computer squeak?

Someone stepped on its mouse.
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What did the picture say to the wall?

I've been framed!
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Why didn't the skeleton cross the road?

He didn't have any guts!
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I know loads of jokes about cash machines,

I just can't think of one atm.
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What's the difference between in-laws and outlaws?

Outlaws are wanted.
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Who did Frankenstein take to the dance?

His "ghoul" friend!
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Steal its chair.
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What do you call a bankrupt Santa?

Saint Nickel-less.
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How many folk musicians does it take to change a light bulb?

Seven. One to change it and the other six to sing about how good the old one was.
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