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 is King Arthur's favorite fish?

A swordfish
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How many cats does it takes to screw in a light bulb?

You can throw away your light bulbs. Just douse the cat with gasoline, light it up with a match, and you'll have all the light you need. (Comment: BLEAH!)
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How many Macintosh users does it take to change a light bulb?

None. You have to replace the whole motherboard.
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Why is slippery ice like music?

If you don't C sharp - you'll B flat!

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How do dinosaurs pay their bills?

With Tyrannosaurus checks.
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Why are kindergarten teachers so good?

They can make little things count.
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What did the alien say to the garden?

Take me to your weeder!
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Why does everybody like Frosty the Snowman?

Because he is so cool!
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How are doughnuts and golf alike?

They both have a hole in one!
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