QEF

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

QEF

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

Much less used than QED. Traditionally used to end passages other than proofs, such as geometric constructions – a “how-to”, not a persuasive argument.

• QED

• (US) IPA^(key): /kwɛf/, /kjuː iː ˈɛf/ (can be pronounced as an acronym or as an initialism)

QEF (plural QEFs)

1. (taxation) Acronym of qualified election fund

• PFIC