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 do you call a country where everyone has to drive a red car?
A red carnation.
What do you call a country where everyone has to drive a pink car?
A pink car-nation.
What would the country be called if everyone in it lived in their cars?

An in-car-nation.
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What is the difference between a car and a bull?

A car only has one horn.
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What's 182 feet tall and made out of pepperoni and cheese?

The leaning tower of Pizza.
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Why did the doughnut shop close?

The owner got tired of the (w)hole business!
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What do you get when you cross a duck with a vampire?

Count Quackula!
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Making bad chemistry jokes because all the good ones Argon
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What did the pencil say to the paper?

I dot my i's on you!
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What is "HIJKLMNO"?

H2O.
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What do you call an elephant in a phone booth?

Stuck
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