MAYBE 0.17/0.20 MAYBE 0.17/0.20 0.17/0.20 Problem: 0.17/0.20 active(from(X)) -> mark(cons(X,from(s(X)))) 0.17/0.20 active(after(0(),XS)) -> mark(XS) 0.17/0.20 active(after(s(N),cons(X,XS))) -> mark(after(N,XS)) 0.17/0.20 active(from(X)) -> from(active(X)) 0.17/0.20 active(cons(X1,X2)) -> cons(active(X1),X2) 0.17/0.20 active(s(X)) -> s(active(X)) 0.17/0.20 active(after(X1,X2)) -> after(active(X1),X2) 0.17/0.20 active(after(X1,X2)) -> after(X1,active(X2)) 0.17/0.20 from(mark(X)) -> mark(from(X)) 0.17/0.20 cons(mark(X1),X2) -> mark(cons(X1,X2)) 0.17/0.20 s(mark(X)) -> mark(s(X)) 0.17/0.20 after(mark(X1),X2) -> mark(after(X1,X2)) 0.17/0.20 after(X1,mark(X2)) -> mark(after(X1,X2)) 0.17/0.20 proper(from(X)) -> from(proper(X)) 0.17/0.20 proper(cons(X1,X2)) -> cons(proper(X1),proper(X2)) 0.17/0.20 proper(s(X)) -> s(proper(X)) 0.17/0.20 proper(after(X1,X2)) -> after(proper(X1),proper(X2)) 0.17/0.20 proper(0()) -> ok(0()) 0.17/0.20 from(ok(X)) -> ok(from(X)) 0.17/0.20 cons(ok(X1),ok(X2)) -> ok(cons(X1,X2)) 0.17/0.20 s(ok(X)) -> ok(s(X)) 0.17/0.20 after(ok(X1),ok(X2)) -> ok(after(X1,X2)) 0.17/0.20 top(mark(X)) -> top(proper(X)) 0.17/0.20 top(ok(X)) -> top(active(X)) 0.17/0.20 0.17/0.20 Proof: 0.17/0.20 Open 0.17/0.20 EOF