es-bact{i:l}
es-bact(ds; da; a; es; n; e1; e2)
== case TERMOF{decidableecl-es-act:ObjectId, 1:l, i:l}
== case (ds == case ,da == case ,a == case ,es == case ,loc(e1)
== case ,x.axiom
== case ,x,y. axiom
== case ,n == case ,e1 == case ,e2)
== of inl(x) => tt
== o| inr(x) => ff
es-bact{i:l}
es-bact(ds; da; a; es; n; e1; e2)
== case TERMOF{decidableecl-es-act:ObjectId, 1:l, i:l}
== case (ds == case ,da == case ,a == case ,es == case ,es-loc(es; e1)
== case ,x.axiom
== case ,x,y. axiom
== case ,n == case ,e1 == case ,e2)
== of inl(x) => tt
== o| inr(x) => ff