Any function with type (List a -> List a) returns a list containing only elements in the input list. … QED
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@fogus Hmm not quite. This happened http://ttic.uchicago.edu/~dreyer/course/papers/wadler.pdf … - Show replies
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@NathanSmutz@fogus It is my understanding that Argument From Incredulity is a perfectly acceptable method of proof. On Twitter.
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