Exhaust may refer to: In mathematics: Proof by exhaustion, proof by examining all individual cases Exhaustion by compact sets, in analysis, a sequence of compact sets that converges on a given set Collectively exhaustive, in probability and set theory, a collection of sets whose union equals the complete space Method of exhaustion, in geometry, finding the area of a shape by approximating it with polygons In engines and technology: Exhaust gas, a gas which occurs as a result of combustion… (More on Exhaust)