NO Problem: a__zeros() -> cons(0(),zeros()) a__and(tt(),X) -> mark(X) a__length(nil()) -> 0() a__length(cons(N,L)) -> s(a__length(mark(L))) a__take(0(),IL) -> nil() a__take(s(M),cons(N,IL)) -> cons(mark(N),take(M,IL)) mark(zeros()) -> a__zeros() mark(and(X1,X2)) -> a__and(mark(X1),X2) mark(length(X)) -> a__length(mark(X)) mark(take(X1,X2)) -> a__take(mark(X1),mark(X2)) mark(cons(X1,X2)) -> cons(mark(X1),X2) mark(0()) -> 0() mark(tt()) -> tt() mark(nil()) -> nil() mark(s(X)) -> s(mark(X)) a__zeros() -> zeros() a__and(X1,X2) -> and(X1,X2) a__length(X) -> length(X) a__take(X1,X2) -> take(X1,X2) Proof: Matrix Interpretation Processor: dim=1 interpretation: [length](x0) = x0, [and](x0, x1) = x0 + x1, [take](x0, x1) = x0 + 2x1, [a__take](x0, x1) = x0 + 2x1, [s](x0) = 2x0, [a__length](x0) = x0, [nil] = 0, [mark](x0) = x0, [a__and](x0, x1) = x0 + x1, [tt] = 2, [cons](x0, x1) = x0 + 2x1, [zeros] = 0, [0] = 0, [a__zeros] = 0 orientation: a__zeros() = 0 >= 0 = cons(0(),zeros()) a__and(tt(),X) = X + 2 >= X = mark(X) a__length(nil()) = 0 >= 0 = 0() a__length(cons(N,L)) = 2L + N >= 2L = s(a__length(mark(L))) a__take(0(),IL) = 2IL >= 0 = nil() a__take(s(M),cons(N,IL)) = 4IL + 2M + 2N >= 4IL + 2M + N = cons(mark(N),take(M,IL)) mark(zeros()) = 0 >= 0 = a__zeros() mark(and(X1,X2)) = X1 + X2 >= X1 + X2 = a__and(mark(X1),X2) mark(length(X)) = X >= X = a__length(mark(X)) mark(take(X1,X2)) = X1 + 2X2 >= X1 + 2X2 = a__take(mark(X1),mark(X2)) mark(cons(X1,X2)) = X1 + 2X2 >= X1 + 2X2 = cons(mark(X1),X2) mark(0()) = 0 >= 0 = 0() mark(tt()) = 2 >= 2 = tt() mark(nil()) = 0 >= 0 = nil() mark(s(X)) = 2X >= 2X = s(mark(X)) a__zeros() = 0 >= 0 = zeros() a__and(X1,X2) = X1 + X2 >= X1 + X2 = and(X1,X2) a__length(X) = X >= X = length(X) a__take(X1,X2) = X1 + 2X2 >= X1 + 2X2 = take(X1,X2) problem: a__zeros() -> cons(0(),zeros()) a__length(nil()) -> 0() a__length(cons(N,L)) -> s(a__length(mark(L))) a__take(0(),IL) -> nil() a__take(s(M),cons(N,IL)) -> cons(mark(N),take(M,IL)) mark(zeros()) -> a__zeros() mark(and(X1,X2)) -> a__and(mark(X1),X2) mark(length(X)) -> a__length(mark(X)) mark(take(X1,X2)) -> a__take(mark(X1),mark(X2)) mark(cons(X1,X2)) -> cons(mark(X1),X2) mark(0()) -> 0() mark(tt()) -> tt() mark(nil()) -> nil() mark(s(X)) -> s(mark(X)) a__zeros() -> zeros() a__and(X1,X2) -> and(X1,X2) a__length(X) -> length(X) a__take(X1,X2) -> take(X1,X2) Matrix Interpretation Processor: dim=1 interpretation: [length](x0) = x0, [and](x0, x1) = x0 + 3x1 + 1, [take](x0, x1) = x0 + x1 + 1, [a__take](x0, x1) = x0 + x1 + 1, [s](x0) = x0, [a__length](x0) = x0, [nil] = 0, [mark](x0) = x0, [a__and](x0, x1) = x0 + 3x1 + 1, [tt] = 0, [cons](x0, x1) = 2x0 + x1, [zeros] = 0, [0] = 0, [a__zeros] = 0 orientation: a__zeros() = 0 >= 0 = cons(0(),zeros()) a__length(nil()) = 0 >= 0 = 0() a__length(cons(N,L)) = L + 2N >= L = s(a__length(mark(L))) a__take(0(),IL) = IL + 1 >= 0 = nil() a__take(s(M),cons(N,IL)) = IL + M + 2N + 1 >= IL + M + 2N + 1 = cons(mark(N),take(M,IL)) mark(zeros()) = 0 >= 0 = a__zeros() mark(and(X1,X2)) = X1 + 3X2 + 1 >= X1 + 3X2 + 1 = a__and(mark(X1),X2) mark(length(X)) = X >= X = a__length(mark(X)) mark(take(X1,X2)) = X1 + X2 + 1 >= X1 + X2 + 1 = a__take(mark(X1),mark(X2)) mark(cons(X1,X2)) = 2X1 + X2 >= 2X1 + X2 = cons(mark(X1),X2) mark(0()) = 0 >= 0 = 0() mark(tt()) = 0 >= 0 = tt() mark(nil()) = 0 >= 0 = nil() mark(s(X)) = X >= X = s(mark(X)) a__zeros() = 0 >= 0 = zeros() a__and(X1,X2) = X1 + 3X2 + 1 >= X1 + 3X2 + 1 = and(X1,X2) a__length(X) = X >= X = length(X) a__take(X1,X2) = X1 + X2 + 1 >= X1 + X2 + 1 = take(X1,X2) problem: a__zeros() -> cons(0(),zeros()) a__length(nil()) -> 0() a__length(cons(N,L)) -> s(a__length(mark(L))) a__take(s(M),cons(N,IL)) -> cons(mark(N),take(M,IL)) mark(zeros()) -> a__zeros() mark(and(X1,X2)) -> a__and(mark(X1),X2) mark(length(X)) -> a__length(mark(X)) mark(take(X1,X2)) -> a__take(mark(X1),mark(X2)) mark(cons(X1,X2)) -> cons(mark(X1),X2) mark(0()) -> 0() mark(tt()) -> tt() mark(nil()) -> nil() mark(s(X)) -> s(mark(X)) a__zeros() -> zeros() a__and(X1,X2) -> and(X1,X2) a__length(X) -> length(X) a__take(X1,X2) -> take(X1,X2) Matrix Interpretation Processor: dim=1 interpretation: [length](x0) = x0 + 2, [and](x0, x1) = x0 + x1, [take](x0, x1) = x0 + x1 + 2, [a__take](x0, x1) = x0 + x1 + 2, [s](x0) = x0, [a__length](x0) = x0 + 2, [nil] = 0, [mark](x0) = x0, [a__and](x0, x1) = x0 + x1, [tt] = 1, [cons](x0, x1) = 4x0 + x1, [zeros] = 4, [0] = 0, [a__zeros] = 4 orientation: a__zeros() = 4 >= 4 = cons(0(),zeros()) a__length(nil()) = 2 >= 0 = 0() a__length(cons(N,L)) = L + 4N + 2 >= L + 2 = s(a__length(mark(L))) a__take(s(M),cons(N,IL)) = IL + M + 4N + 2 >= IL + M + 4N + 2 = cons(mark(N),take(M,IL)) mark(zeros()) = 4 >= 4 = a__zeros() mark(and(X1,X2)) = X1 + X2 >= X1 + X2 = a__and(mark(X1),X2) mark(length(X)) = X + 2 >= X + 2 = a__length(mark(X)) mark(take(X1,X2)) = X1 + X2 + 2 >= X1 + X2 + 2 = a__take(mark(X1),mark(X2)) mark(cons(X1,X2)) = 4X1 + X2 >= 4X1 + X2 = cons(mark(X1),X2) mark(0()) = 0 >= 0 = 0() mark(tt()) = 1 >= 1 = tt() mark(nil()) = 0 >= 0 = nil() mark(s(X)) = X >= X = s(mark(X)) a__zeros() = 4 >= 4 = zeros() a__and(X1,X2) = X1 + X2 >= X1 + X2 = and(X1,X2) a__length(X) = X + 2 >= X + 2 = length(X) a__take(X1,X2) = X1 + X2 + 2 >= X1 + X2 + 2 = take(X1,X2) problem: a__zeros() -> cons(0(),zeros()) a__length(cons(N,L)) -> s(a__length(mark(L))) a__take(s(M),cons(N,IL)) -> cons(mark(N),take(M,IL)) mark(zeros()) -> a__zeros() mark(and(X1,X2)) -> a__and(mark(X1),X2) mark(length(X)) -> a__length(mark(X)) mark(take(X1,X2)) -> a__take(mark(X1),mark(X2)) mark(cons(X1,X2)) -> cons(mark(X1),X2) mark(0()) -> 0() mark(tt()) -> tt() mark(nil()) -> nil() mark(s(X)) -> s(mark(X)) a__zeros() -> zeros() a__and(X1,X2) -> and(X1,X2) a__length(X) -> length(X) a__take(X1,X2) -> take(X1,X2) Unfolding Processor: loop length: 3 terms: a__length(cons(N,zeros())) s(a__length(mark(zeros()))) s(a__length(a__zeros())) context: s([]) substitution: N -> 0() Qed