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What's yellow, linear, normed, and complete? A Bananach space

Why do plants hate math? It gives them square roots.

What is yellow and equivalent to the Axiom of Choice? Zorn's lemmon.

Why did Emil Artin's necklace keep falling off? It had a descending chain condition.

A father noticed his son was sad coming home from school one day. “What’s wrong?” The father asked. “I really...