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Hereditary substitution is an algorithm that directly computes the canonical result of an ordinary substitution of one canonical form into another. (from Twelf)
7
votes
What is hereditary substitution and why should I use it?
Just a note about sum types: it's fair to say that eta for sums is not yet tractable, but I'd strongly disagree with the claim that it's practically infeasible in general.
Regardless of whether they a …