An after-the-fact justification for an action, in the work of sociologist Vilfredo Pareto

Derivation (abstract algebra)

Derivation (linguistics)

The creation of a derived row, in the twelve-tone musical technique

Parse tree

Proof may refer to: A rigorous, compelling argument, including: Mathematical proof Proof theory, a branch of mathematical logic that represents proofs as formal mathematical objects Logical argument Evidence (law), tested evidence or a legal proof...