Definition:Corollary
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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.
Linguistic Note
The word corollary is ultimately derived from the Latin corolla, meaning small garland, or the money paid for it.
Hence it also has the sense of something extra, lagniappe, freebie, a cherry on the top.
Sources
- 1989: Ephraim J. Borowski and Jonathan M. Borwein: Dictionary of Mathematics ... (previous) ... (next): corollary
- 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): corollary
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): corollary
- 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): corollary