Bad Mathematical Jokes

(the word bad is redundant but...)

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Mathematical jokes are, as a rule, extremely bad. And these jokes are no exception. I do enjoy them though for some reason and here is my collection of them. Thanks go to Matthew Westcott, John Ramsdale, Eric Plumb, Aidan Burrows and Chris Mellor, for being the people who first told me these. If you know any mathematical jokes not listed here then please do send them to me.
What do you get if you cross a pencil and a banana?
Pencil banana multiplied by the sine of the angle between them multiplied by the unit vector in the direction mutually perpendicular to pencil and banana.

What do you get if you cross a mountain climber with an elephant?
Nothing, a mountain climber is a scaler.

Why did the cat fall off the roof?
It had lost its mu.

What is Integral (1/cabin dcabin)?
Beach hut. It's log cabin + c.

Why did the complex number calculations go pear-shaped?
Instead of using de Moivre's theorem, someone accidentally used de Poivre's theorem.

2+2=5 for large values of 2.

Did you hear about the song by Lindasfarne about cotangents?
It goes "Cos over sine is all mine, all mine, cos over sine is all mine..."

How can you tell everyone gets exasperated when working out radii of curvature?
Because of all the d(psi)s.

Trees with square roots don't have very natural logs.


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