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The Clue
Abbr. in a math textbook (3 letter answer)
The Answer
QED
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Notes
The answer QED is seen frequently, appearing about once every 160 puzzles.
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End of a demonstration?
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Ending letters
Euclidean abbr.
Geometer's P.S.
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Letters of triumph
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Math abbr.
Math finale
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As shown, for short
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Abbr. at the end of a proof
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Mathematician's sign-off
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Mathematician's "ta-da"
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Letters seen by a proof reader?
Abbr. after a series of equations, maybe
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Definition
QED as a noun:
1. (quantum electrodynamics, QED) = a relativistic quantum theory of the electromagnetic interactions of photons and electrons and muons