Goodstein's theorem is a statement about the natural numbers which states that every Goodstein sequence eventually terminates at 0.
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Anastasia Goodstein is the publisher of Ypulse, a Forbes magazine Best of the Web blog.
Laurie Kirby and Jeff Paris gave an interpretation of the Goodstein's theorem as a hydra game: the "Hydra" is a rooted tree, and a move consists of cutting off one of its "heads" (a branch of the tree), to which the hydra responds by growing a finite number of new heads according to certain rules.
It was established in 1988 by David B. Goodstein (publisher of The Advocate) and Bruce Voeller (an early leader of the National Gay Task Force).
Paul Raeburn wrote in The New York Times that Goodstein's prediction regarding peak oil and future of civilization is based on an understanding of physics and thermodynamics, and on a simple observation about natural resources.