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The two maths jokes that I can remember from my undergrad days are:

"What's purple and commutes?" "An abelian grape"

"What's yellow and equivalent to the axiom of choice?" "Zorn's Lemon"

Evidently there's something inherently funny about group theory.

My favorite math joke, imagine a professor speaking: "I explained it in my seminar, but they didn't seem to understand. So, I had to explain it again, and again they didn't get it. I ended up explaining it a third time, and by that point I understood it, but they still didn't understand.

Many more jokes of varies quality: https://mathoverflow.net/questions/1083/do-good-math-jokes-e...

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

You still missed one, because there are four canonical math fruit jokes: http://www.stoneswww.academickids.com/encyclopedia/index.php...

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