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 do if your cat swallows your pencil?

Use a pen.
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Where does a ten ton elephant sit?

Anywhere it wants to
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How many nuclear engineers does it take to change a light bulb?

Seven. One to install the new bulb and six to figure out what to do with the old one for the next 10,000 years.
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What do you call an elephant in a phone booth?

Stuck
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What is a tree's favorite drink?

Root beer.
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What do you call a cow that twitches?

Beef jerky
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What do you call a cow that plays a musical instrument?

A Moo-sician!

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What was the first animal in space?

The cow that jumped over the moon!
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What did the dog say to the flea?

Stop bugging me!
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