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• Q: What is sour, yellow, and equivalent to the axiom of choice... A: Zorn's lemon...
• Q: What's purple and commutes? A: An abelian grape.
  Q: What's yellow, and equivalent to the Axiom of Choice? A: Zorn's Lemon. James Currie...
• Q: What's purple and commutes? A: An abelian grape.
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• Q: What is normed, complete, and yellow? A: A Bananach space...
• Q: What's yellow, ugly and sleeps alone? A: Yoko Ono.
• Q: What is the difference between a flashing red traffic light and a flashing yellow traffic light?
  A: The color....
• Q: What is a mathematician's pick when faced with the choice between poutine and eternal bliss in the afterlife?
  A: Poutine! Because nothing is better than eternal bliss in the afterlife, and poutine is better than nothing....
• Q: What color is a bee? A: Yellow. Q: How many wings does a bird have?
  A: Two. Q: How many teeth does a cat have? A...
• What do you call a n Oriental on barbiturates? A mello-yellow.