QEF
English
Etymology
(deprecated template usage) [etyl] Latin quod erat faciendum (“what was to have been done”), from (deprecated template usage) [etyl] Ancient Greek ὅπερ ἔδει ποιῆσαι (hóper édei poiêsai).
Phrase
QEF
- “quod erat faciendum”, “what was to have been done” – used to end a mathematical passage other than a proof.
Usage notes
Much less used than QED. Traditionally used to end passages other than proofs, such as geometric constructions – a “how-to”, not a persuasive argument.