Algebra Etc.(@AlgebraFact) 's Twitter Profileg
Algebra Etc.

@AlgebraFact

Tweets about algebra, number theory, and miscellaneous math by @JohnDCook.

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linkhttp://JohnDCook.com calendar_today30-01-2010 21:11:41

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A semigroup is a set with an associative binary operation. A monoid is a semigroup with identity. A group is a monoid with inverses.

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'Most commonly, a classification yields a stale and useless list -- a phone book more than a tourist guide.' -- Terry Gannon

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