YES Problem: a__filter(cons(X,Y),0(),M) -> cons(0(),filter(Y,M,M)) a__filter(cons(X,Y),s(N),M) -> cons(mark(X),filter(Y,N,M)) a__sieve(cons(0(),Y)) -> cons(0(),sieve(Y)) a__sieve(cons(s(N),Y)) -> cons(s(mark(N)),sieve(filter(Y,N,N))) a__nats(N) -> cons(mark(N),nats(s(N))) a__zprimes() -> a__sieve(a__nats(s(s(0())))) mark(filter(X1,X2,X3)) -> a__filter(mark(X1),mark(X2),mark(X3)) mark(sieve(X)) -> a__sieve(mark(X)) mark(nats(X)) -> a__nats(mark(X)) mark(zprimes()) -> a__zprimes() mark(cons(X1,X2)) -> cons(mark(X1),X2) mark(0()) -> 0() mark(s(X)) -> s(mark(X)) a__filter(X1,X2,X3) -> filter(X1,X2,X3) a__sieve(X) -> sieve(X) a__nats(X) -> nats(X) a__zprimes() -> zprimes() Proof: DP Processor: DPs: a__filter#(cons(X,Y),s(N),M) -> mark#(X) a__sieve#(cons(s(N),Y)) -> mark#(N) a__nats#(N) -> mark#(N) a__zprimes#() -> a__nats#(s(s(0()))) a__zprimes#() -> a__sieve#(a__nats(s(s(0())))) mark#(filter(X1,X2,X3)) -> mark#(X3) mark#(filter(X1,X2,X3)) -> mark#(X2) mark#(filter(X1,X2,X3)) -> mark#(X1) mark#(filter(X1,X2,X3)) -> a__filter#(mark(X1),mark(X2),mark(X3)) mark#(sieve(X)) -> mark#(X) mark#(sieve(X)) -> a__sieve#(mark(X)) mark#(nats(X)) -> mark#(X) mark#(nats(X)) -> a__nats#(mark(X)) mark#(zprimes()) -> a__zprimes#() mark#(cons(X1,X2)) -> mark#(X1) mark#(s(X)) -> mark#(X) TRS: a__filter(cons(X,Y),0(),M) -> cons(0(),filter(Y,M,M)) a__filter(cons(X,Y),s(N),M) -> cons(mark(X),filter(Y,N,M)) a__sieve(cons(0(),Y)) -> cons(0(),sieve(Y)) a__sieve(cons(s(N),Y)) -> cons(s(mark(N)),sieve(filter(Y,N,N))) a__nats(N) -> cons(mark(N),nats(s(N))) a__zprimes() -> a__sieve(a__nats(s(s(0())))) mark(filter(X1,X2,X3)) -> a__filter(mark(X1),mark(X2),mark(X3)) mark(sieve(X)) -> a__sieve(mark(X)) mark(nats(X)) -> a__nats(mark(X)) mark(zprimes()) -> a__zprimes() mark(cons(X1,X2)) -> cons(mark(X1),X2) mark(0()) -> 0() mark(s(X)) -> s(mark(X)) a__filter(X1,X2,X3) -> filter(X1,X2,X3) a__sieve(X) -> sieve(X) a__nats(X) -> nats(X) a__zprimes() -> zprimes() Matrix Interpretation Processor: dim=1 interpretation: [a__zprimes#] = 7, [a__nats#](x0) = 2x0 + 1, [a__sieve#](x0) = x0, [mark#](x0) = 2x0, [a__filter#](x0, x1, x2) = 4x0 + 2x1 + 2x2, [zprimes] = 7, [a__zprimes] = 7, [nats](x0) = 2x0 + 2, [a__nats](x0) = 2x0 + 2, [sieve](x0) = x0 + 1, [a__sieve](x0) = x0 + 1, [mark](x0) = x0, [s](x0) = x0 + 1, [filter](x0, x1, x2) = 4x0 + x1 + x2 + 4, [a__filter](x0, x1, x2) = 4x0 + x1 + x2 + 4, [0] = 0, [cons](x0, x1) = 2x0 + 1 orientation: a__filter#(cons(X,Y),s(N),M) = 2M + 2N + 8X + 6 >= 2X = mark#(X) a__sieve#(cons(s(N),Y)) = 2N + 3 >= 2N = mark#(N) a__nats#(N) = 2N + 1 >= 2N = mark#(N) a__zprimes#() = 7 >= 5 = a__nats#(s(s(0()))) a__zprimes#() = 7 >= 6 = a__sieve#(a__nats(s(s(0())))) mark#(filter(X1,X2,X3)) = 8X1 + 2X2 + 2X3 + 8 >= 2X3 = mark#(X3) mark#(filter(X1,X2,X3)) = 8X1 + 2X2 + 2X3 + 8 >= 2X2 = mark#(X2) mark#(filter(X1,X2,X3)) = 8X1 + 2X2 + 2X3 + 8 >= 2X1 = mark#(X1) mark#(filter(X1,X2,X3)) = 8X1 + 2X2 + 2X3 + 8 >= 4X1 + 2X2 + 2X3 = a__filter#(mark(X1),mark(X2),mark(X3)) mark#(sieve(X)) = 2X + 2 >= 2X = mark#(X) mark#(sieve(X)) = 2X + 2 >= X = a__sieve#(mark(X)) mark#(nats(X)) = 4X + 4 >= 2X = mark#(X) mark#(nats(X)) = 4X + 4 >= 2X + 1 = a__nats#(mark(X)) mark#(zprimes()) = 14 >= 7 = a__zprimes#() mark#(cons(X1,X2)) = 4X1 + 2 >= 2X1 = mark#(X1) mark#(s(X)) = 2X + 2 >= 2X = mark#(X) a__filter(cons(X,Y),0(),M) = M + 8X + 8 >= 1 = cons(0(),filter(Y,M,M)) a__filter(cons(X,Y),s(N),M) = M + N + 8X + 9 >= 2X + 1 = cons(mark(X),filter(Y,N,M)) a__sieve(cons(0(),Y)) = 2 >= 1 = cons(0(),sieve(Y)) a__sieve(cons(s(N),Y)) = 2N + 4 >= 2N + 3 = cons(s(mark(N)),sieve(filter(Y,N,N))) a__nats(N) = 2N + 2 >= 2N + 1 = cons(mark(N),nats(s(N))) a__zprimes() = 7 >= 7 = a__sieve(a__nats(s(s(0())))) mark(filter(X1,X2,X3)) = 4X1 + X2 + X3 + 4 >= 4X1 + X2 + X3 + 4 = a__filter(mark(X1),mark(X2),mark(X3)) mark(sieve(X)) = X + 1 >= X + 1 = a__sieve(mark(X)) mark(nats(X)) = 2X + 2 >= 2X + 2 = a__nats(mark(X)) mark(zprimes()) = 7 >= 7 = a__zprimes() mark(cons(X1,X2)) = 2X1 + 1 >= 2X1 + 1 = cons(mark(X1),X2) mark(0()) = 0 >= 0 = 0() mark(s(X)) = X + 1 >= X + 1 = s(mark(X)) a__filter(X1,X2,X3) = 4X1 + X2 + X3 + 4 >= 4X1 + X2 + X3 + 4 = filter(X1,X2,X3) a__sieve(X) = X + 1 >= X + 1 = sieve(X) a__nats(X) = 2X + 2 >= 2X + 2 = nats(X) a__zprimes() = 7 >= 7 = zprimes() problem: DPs: TRS: a__filter(cons(X,Y),0(),M) -> cons(0(),filter(Y,M,M)) a__filter(cons(X,Y),s(N),M) -> cons(mark(X),filter(Y,N,M)) a__sieve(cons(0(),Y)) -> cons(0(),sieve(Y)) a__sieve(cons(s(N),Y)) -> cons(s(mark(N)),sieve(filter(Y,N,N))) a__nats(N) -> cons(mark(N),nats(s(N))) a__zprimes() -> a__sieve(a__nats(s(s(0())))) mark(filter(X1,X2,X3)) -> a__filter(mark(X1),mark(X2),mark(X3)) mark(sieve(X)) -> a__sieve(mark(X)) mark(nats(X)) -> a__nats(mark(X)) mark(zprimes()) -> a__zprimes() mark(cons(X1,X2)) -> cons(mark(X1),X2) mark(0()) -> 0() mark(s(X)) -> s(mark(X)) a__filter(X1,X2,X3) -> filter(X1,X2,X3) a__sieve(X) -> sieve(X) a__nats(X) -> nats(X) a__zprimes() -> zprimes() Qed