[narf poit chez BOOM]

i found a math joke site.

Alexander the Great had an Infinite Number of Limbs (From Joel Rubin - grad school days!) (top)

Alexander the Great was forwarned of his fate by an oracle.
Forewarned is fore-armed.
Four arms + 2 legs = 6 limbs.
Six is an odd number of limbs for a man!
Six is even.
No finite number is both odd and even
Therefore Alexander had an infinite number of limbs!

Question: What do you call a bird that flew away from home? (top)

Answer: Poly-gon ! . . . . ha ha ha (from my ex-trig student Will)

Question: What do you get when you divide the circumference
of a Jack-O-Lantern by its diameter? (top)

Answer: Pumpkin Pi !

Three Kinds of People (sent in by my former student L.L.) (top)

There are three kinds of people in this world:
those who are good at math, and those who aren't.

10 Kinds of People (follow-up from my student Lorenzo, now in Italy) (top)

There are 10 kinds of people in the world:
Those who know binary, and those who don't.

Theorem : Perfect Squares Don´t Exist - by Prof Hendrik Lenstra (top)

Proof : Suppose that n is a perfect square. Look at the odd divisors of n.
They all divide the largest of them, which is itself a square, say d^2.
This shows that the odd divisors of n come in pairs a, b, where ab = d^2.
Only d is paired to itself.Therefore the number of odd divisors of n is odd.
This implies that the sum of all divisors of n is also odd. In particular, it is not 2n.
Hence n is not perfect, a contradiction : Perfect squares don´t exist. QED.

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found this while looking for all cats have five legs. this'll do.

(idea) by Wntrmute (10.9 hr) (print)
Theorem: All Cats have nine tails.
Proof:
No cat has eight tails.
One cat has one more tail than no cats.
Therefore, all cats have nine tails.

All Cats are mortal.
Socrates is mortal.
Therefore, Socrates is a cat.

(idea) by exceptinsects (1.5 d) (print) ? Sun Jul 22 2001 at 7:28:03

In a Musical Acoustics (AKA Physics for Idiots) class final at Oberlin College, we were given a question that began:

Imagine you are playing a saxophone on the planet Jupiter and there is a large cat blocking the mouth of the saxophone...

[ July 10, 2003, 07:06: Message edited by: narf poit chez BOOM ]