Definitions | x L. P(x), R ||- es.P(es), P Q, left+right, A || B, s = t, Prop, Realizer, type List, Type, x:A B(x), x:A B(x), R-Feasible(R), x(s1,s2), x L.R(x),  x. t(x), {x:A| B(x) }, (x l), ES, P & Q, P  Q, t T, x:A. B(x), Consistent(R;es), x(s), f(a), x.A(x), P  Q |