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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If H2O is the formula for water, what is the formula for ice?

H2O cubed.
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Doc, I can't stop singing the 'Green Green Grass of Home'. He said: 'That sounds like Tom Jones syndrome'. 'Is it common?'I asked.

'It's not unusual' he replied.

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What has one horn and gives milk?

A milk truck.
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What do cats and dogs call Santa Clause?

Santa paws!!!
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What is as big as an elephant but weighs nothing?

Its shadow
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I asked the guy sitting next to me if he had any Sodium Hypobromite

He said NaBrO
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Why did the cow go in the spaceship?

It wanted to see the mooooooon!
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Why are the middle ages sometimes called the Dark Ages?

Because they had so many knights.
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What do you call a cheese factory in the Middle East?

Cheeses of Nazareth.
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