EnglishEdit

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EtymologyEdit

Latin quod erat faciendum (what was to have been done), from Ancient Greek ὅπερ ἔδει ποιῆσαι (hoper edei poiēsai).

InitialismEdit

QEF

  1. “quod erat faciendum”, “what was to have been done” – used to end a mathematical passage other than a proof.

Usage notesEdit

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 termsEdit

Last modified on 26 May 2013, at 16:10