added an intro lemma for freshness of products; set up
the simplifier so that it can deal with the compact and
long notation for freshness constraints (FIXME: it should
also be able to deal with the special case of freshness
of atoms)
structure ROOT =
struct
structure HOL =
struct
datatype boola = True | False;
fun nota False = True
| nota True = False;
fun op_conj y True = y
| op_conj x False = False
| op_conj True y = y
| op_conj False x = False;
end; (*struct HOL*)
structure Nat =
struct
datatype nat = Zero_nat | Suc of nat;
fun less_nat Zero_nat (Suc n) = HOL.True
| less_nat n Zero_nat = HOL.False
| less_nat (Suc m) (Suc n) = less_nat m n;
fun less_eq_nat m n = HOL.nota (less_nat n m);
end; (*struct Nat*)
structure Codegen =
struct
fun in_interval (k, l) n =
HOL.op_conj (Nat.less_eq_nat k n) (Nat.less_eq_nat n l);
end; (*struct Codegen*)
end; (*struct ROOT*)