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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Where was the Declaration of Independence signed?

On the bottom.
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What did the little boy's mom say when he asked her to buy him shoes for gym?

"Tell Jim to buy his own shoes".
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A young blonde woman is distraught because she fears her husband is having an affair, so she goes to a gun shop and buys a handgun. The next day she comes home to find her husband in bed with a beautiful redhead. She grabs the gun and holds it to her own head. The husband jumps out of bed, begging and pleading with her not to shoot herself.

The blonde responds to the husband, "Shut up...you're next!"
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A jump-lead walks into a bar.

The barman says "I'll serve you, but don't start anything"
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I know loads of jokes about cash machines,

I just can't think of one atm.
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How many astronomers does it take to change a light bulb?

None. Astronomers prefer the dark.
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What's the difference between a fish and a piano?

You can't tuna fish.
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Who can hold up a bus with one hand?

A crossing guard.
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What did the carrot say to the rabbit?

Do you want to grab a bite?
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