Section PARALLEL_OPERATORS.
Variable x y z : proc.
Variable E F : Set.
Variable e : E.
Variable f : F.
Variable a b : act.

Axiom CM1 : alt (alt (Lmer x y) (Lmer y x)) (comm x y) = mer x y.
Axiom CM2 : seq (ia E a e) x = Lmer (ia E a e) x.
Axiom CM3 : seq (ia E a e) (mer x y) = Lmer (seq (ia E a e) x) y.
Axiom CM4 : alt (Lmer x z) (Lmer y z) = Lmer (alt x y) z.