There's another one: QEA, quod est absurdum, to be used at the of a proof by contradiction. Have you ever met that?
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Jim Simons
#MathsToday, well yesterday. I was taught QED, quod erat demonstrandum (which was to be proved), at the age of about 12, when we were taught Eulcid-style proofs. TIL QEF, quod erat faciendum (... done), QEI, quod erat inveniendum (... found.) Has anyone every seen these? Were they really used?
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