[Haskell-cafe] Linguistic hair-splitting

Andrew Coppin andrewcoppin at btinternet.com
Wed Jan 27 13:30:02 EST 2010

Here's one for you to ponder.

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. 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.)

Now, here's the question: Is is correct to say that [3, 5, 8] is a 
monad? Is it correct to say that lists are a monad? Or would it be more 
correct to say that lists "form" a monad?

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