I just find it noteworthy that sum and (+) do roughly the same thing and that (+) could be implemented in terms of sum:
(+) a b = sum [a,b]
Another way to put it is that sum does it work by folding (+)
I was talking with someone in #haskell that felt these related functions really should have different names.
And I suppose the culture of (+) comes from math and binary addition. And in english we say "sum a list", so it does seem that choosing widely different names for computationally and conceptually similar functions is indeed valid.
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