Symbols:Abbreviations/Q
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Q
QED
The initials of Quod Erat Demonstrandum, which is Latin for which was to be demonstrated.
These initials were traditionally added to the end of a proof, after the last line which is supposed to contain the statement that was to be proved.
QEF
The initials of Quod Erat Faciendum, which is Latin for which was to be done.
These initials were traditionally added to the end of a geometric construction.
QEI
The initials of Quod Erat Inveniendum, which is Latin for which was to be found.
These initials were traditionally added after the completion of a calculation (either arithmetic or algebraic).