Proof may refer to: Proof (truth), argument or sufficient evidence for the truth of a proposition Formal proof Mathematical proof, a convincing demonstration that some mathematical statement is necessarily true Proof theory, a branch of mathematical logic that represents proofs as formal mathematical objects Alcohol proof, a measure of an alcoholic drink's strength Artist's proof, a single print taken during the printmaking process Galley proof, a preliminary version of a publication Prepress proof, a facsimile of press artwork for job verification Proof coinage, coins once made as a test, but now specially struck for collectors Proofreading, reviewing a manuscript or artwork for errors or improvements Proofing (baking technique), the process by which a yeast-leavened dough rises, also called "proving"