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Symbols and signature for unification rules.
This module provides a signature to be used to handle unification rules. The signature is not attached to any real lambdapi file and is henceforth qualified to be a "ghost" signature.
val equiv : Term.sym
Symbol "≡".
val cons : Term.sym
Symbol ";".
unpack eqs
transforms a term of the form cons (equiv t u) (cons (equiv v w) ...)
into a list [(t,u); (v,w); ...]
.
val mem : Term.sym -> bool
mem s
is true iff s
belongs to sign
.