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 policeman give the sheep a ticket?

He made an illegal ewe turn.
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What goes tick-tock, bow-wow, tick-tock, bow-wow?

A watch dog.
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What happened to the man who was stopped for having sodium chloride and a nine-volt in his car?

He was booked for a salt and battery.
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What's a frog's favorite drink?

Croak-a-cola.
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I know loads of jokes about cash machines,

I just can't think of one atm.
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I stayed up all night because I wanted to see where the sun went,

and then it dawned on me.
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How many big black monoliths does it take to change a light bulb?

Sorry, light bulbs are an evolutionary dead end.
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What kind of cars do cats drive?

Catillacs
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Why was the ant so confused?

Because all his uncles were "ants"!
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