More Bad Mathematical Humour

Courtesy of the Math Club listhost:

Why did the mathematician name his dog “Cauchy”?
Because he left a residue at every pole.

What is a topologist?
Someone who cannot distinguish between a doughnut and a coffee cup.

Why didn’t Newton discover group theory?
Because he wasn’t Abel.

What’s yellow, linear, normed and complete?
A Banananach space.

What do you call a young Eigensheep?
A lamb, duh!

What is a compact city?
It’s a city that can be guarded by finitely many nearsighted policemen.

Why can’t you grow wheat in Z/6Z?
It’s not a field.

What’s the value of a contour integral around Western Europe?
Zero, because all the Poles are in Eastern Europe.
ADDENDUM: Actually, there ARE some Poles in Western Europe, but they are removable!