“ERAT”

The following 2 entries include the term ERAT.

quod erat demonstrandum

Latin phrase

: which (is what) was to be shown (originally) abbreviation QED used at the end of a logical or mathematical proof

quod erat faciendum

Latin phrase

: which (is what) was to be done (originally) abbreviation q.e.f. used at the end of a geometrical construction


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