Definitions | if b t else f fi, p  q, eqof(d), false , x dom(f), f(x), P  Q, MsgA, Prop, ma-single-pre-init1(x;T;c;a;T';y,v.P(y;v)), with ds: ds init: initaction a:T precondition a(v) is P, Top, State(ds), x : v,  x. t(x), x(s1,s2), f(x)?z, t T, IdDeq, Id, x:A. B(x) |