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 you don't know what introspection is,

you need to take a long, hard look at yourself.
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Why is slippery ice like music?

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

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That girl said she knew me from the vegitarian club,

but I'd never seen herbivore [her before]
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What is a frog's favorite year?

Leap Year
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What do ghosts use to wash their hair?

Shamboo!
Frankenstein: Witch can you make me a lemonade?
Witch: Poof you are a lemonade!
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What is black ,white and red all over?

A sunburnt penguin
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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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How many fire safety guys dose it take to screw in a light bulb?

One -- but it's an 8 hour minimum.
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Why don't they know where Mozart is buried?

Because he's Haydn.

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