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QED or Quod Erat Demonstrandum, which loosely translated means "that which was to be demonstrated". It is usually placed at the end of a mathematical proof to indicate that the proof is complete.

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What to prove would be Quad erat demonstrandum. In the text to the legendary Babel Fish Douglas Adams or God himself gives the evidence that it can not exist. QED Babel Fish is a purposely simple design in the otherwise familiar abbreviation Qed from the Euclid textbook, which would be to prove and is such an ideal gift for all nerd geeks mathematician physicists atheists and friends of fantastic science fiction.

Don't forget the plus C, funny maths calculus joke.

Don't forget the plus C, funny maths calculus joke.