[TYPES/announce] New definitions of contexts and free variables for lambda-calculi with explicit substitutions
george.cherevichenko at gmail.com
Wed Mar 27 14:38:31 EDT 2013
Contexts (environments) are not sets or lists without multiplicity, but
have a more complicated structure. There is a natural order on the set of
contexts. A "set" of free variables is not a set, but a context in the new
sense. New definitions simplify working with explicit substitutions.
It is desirable to see this article (Lang and Lescanne) before
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