Path of signature containing unificaton rules symbols.

val sign : Sign.t

Ghost signature holding the symbols used in unification rules.

val equiv : Term.sym

Symbol "≡".

val cons : Term.sym

Symbol ";".

val unpack : Term.term -> (Term.term * Term.term) list

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.