Math Jokes…?

Fruit Flavored:

What is yellow and equivalent to the axiom of choice? Zorn’s lemon
What is green and homeomorphic to the open unit interval? The real lime
What is purple and commutes? An Abelian grape
What is lavender and commutes? An Abelian semigrape
What is purple and all of its offspring have been committed to institutions? A simple grape: it has no normal subgrapes.
What is yellow and is also a complete normed linear space? A Bananach space
What is purple, commutes, and is worshipped occasionally? A finitely venerated abelian grape

Variations on a theme:

Two plus two is three, for sufficiently small two.
Two plus two is three plus epsilon, where epsilon tends to zero as two tends to one and a half.

Miscellany:

What is brown, furry, runs to the sea, and is equivalent to the axiom of choice? Zorn’s lemming
How did the mathematician explain his parrot's death?
"polynomial, polygon"