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 ```Andrew Coppin wrote: >> 7 is a number. 7 is an integer, and integers are numbers. > > 7 is not a field. 7 is an element of [at least one] field, but 7 itself > is not a field. > > 7 is not a group. Why not? It might be useful to use the notation '7' for the cyclic group with 7 elements. > 7 is a member of the set of integers, but the set of > integers is not a group either. The set of integers form a group when > taken together with the addition operator. (And, actually, forms > another, different, group when taken with the multiplication operator.) The integers endowed with the usual multiplication is not a group. (The only invertible elements of this monoid are 1 and -1.) > Now, here's the question: Is is correct to say that [3, 5, 8] is a > monad? In what sense would this be a monad? I don't quite get your question. Cheers, Jochem -- Jochem Berndsen | [email protected] _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe ```