Definition:Corollary

Definition
A corollary is a proof which is a direct result, or a direct application, of another proof.

It can be considered as being a proof for free on the back of a proof which has been paid for with blood, sweat and tears.

The word is ultimately derived from the Latin corolla, meaning small garland, or the money paid for it. Hence has the sense something extra, lagniappe or freebie.