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 did the snowman say to the customer?

Have an ice day!
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Where do horses live?

In the neigh-borhood.
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What kind of dessert does a ghost like?

I scream!
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What is a pirate's favorite's fish?

A swordfish
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What kind of phones do people in jail use?

Cell phones
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I just deleted all the German names off my phone.

It's Hans free.
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What is the best thing to do if you find a gorilla in your bed?

Sleep somewhere else.
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What do you call a gorilla wearing earmuffs?

Anything you like, he can't hear you.
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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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