QEF

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English[edit]

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Etymology[edit]

Latin quod erat faciendum (what was to have been done), from Ancient Greek ὅπερ ἔδει ποιῆσαι (hóper édei poiêsai).

Initialism[edit]

QEF

  1. “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.

Related terms[edit]