Definitions | {T}, P  Q, x:A. B(x), SQType(T), t T, s ~ t, Atom$n, {x:A| B(x)} , es_state(es;i), es_state_when(es;e), x:A B(x), es_vartype(es;i;x), x:A B(x), ES, x:T||a, WellFnd{i}(A;x,y.R(x;y)), t.1, E, (e < e'), (e <loc e'), if b then t else f fi , e sends || a, e receives || a, False, A, e loc e' , P & Q, e e'.P(e), let x,y = A in B(x;y), <a, b>, isrcv(e), P  Q, P   Q, case b of inl(x) => s(x) | inr(y) => t(y), left + right, P Q, Dec(P), Void, pred(e), ,  x. t(x), x.A(x), , loc(e), Id, s = t, first(e), b, i || a, Type |