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