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 robs you while you're in the bathtub?

A robber ducky.
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Why did the sea monster eat five ships that were carrying potatoes?

No one can eat just one potato ship.
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If H20 is water, what is H204?

Drinking, bathing, washing, swimming, etc.
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Why did the boy have his girlfriend put in jail?

She stole his heart.
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How many editors of Poor Richard's Almanac does it take to replace a light bulb?

Many hands make light work.
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There were 10 cats in a boat and one jumped out. How many were left?

None, because they were copycats
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What's the difference between a snow man and a snow woman?

Snow balls!
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What kind of dog has a bark but no bite?

A Dogwood
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Why did the tree go to the dentist?

It needed a root canal.
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