x . x): Int -> Int Bool -> Bool (a->b) -> (a->b)but any valid type will be an instance of the principal type: a -> a. An instance is derived by substituting the same type expression for all occurences of some {type variable}. The principal type of an expression can be computed from those of its subexpressions by Robinson's unification algorithm.(1994-12-16)algorithm.(1994-12-16)……"> principal type : FOLDOC
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principal type : FOLDOC
principal type
The most general type of an expression. For example, the following are all valid types for the lambda abstraction ( x . x):
Int -> Int
Bool -> Bool
(a->b) -> (a->b)

but any valid type will be an instance of the principal type: a -> a. An instance is derived by substituting the same type expression for all occurences of some {type variable}. The principal type of an expression can be computed from those of its subexpressions by Robinson's
unification algorithm.
(1994-12-16)

algorithm.
(1994-12-16)



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