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Weak Head Normal Form. Web lambda calculus is historically significant. (f x) ] = false (2) whnf [ x y ] = whnf [ x ] (3) in all other cases whnf [x] = true (4)
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And once i read through them i thought i got it. Web there is also the notion of weak head normal form: Alonzo church was alan turing’s doctoral advisor, and his lambda calculus predates turing machines. Weak head normal form means, the expression will only evaluate as far as necessary to reach to a data constructor. Therefore, every normal form expression is also in weak head normal form, though the opposite does not hold in general. Aside from a healthy mental workout, we find lambda calculus is sometimes superior: Now, i have following expression: The first argument of seq will only be evaluated to weak head normal form. Web weak head normal form. But more importantly, working through the theory from its original viewpoint exposes us to different ways of thinking.
(f x) ] = false (2) whnf [ x y ] = whnf [ x ] (3) in all other cases whnf [x] = true (4) Now, i have following expression: An expression is in weak head normal form (whnf), if it is either: A constructor (eventually applied to arguments) like true, just (square 42) or (:) 1. Reduction strategies [ edit ] Normal form means, the expression will be fully evaluated. Therefore, every normal form expression is also in weak head normal form, though the opposite does not hold in general. And once i read through them i thought i got it. A term in weak head normal form is either a term in head normal form or a lambda abstraction. The first argument of seq will only be evaluated to weak head normal form. Web reduce terms to weak normal forms only.
