YES Problem: minus(X,0()) -> X minus(s(X),s(Y)) -> p(minus(X,Y)) p(s(X)) -> X div(0(),s(Y)) -> 0() div(s(X),s(Y)) -> s(div(minus(X,Y),s(Y))) Proof: DP Processor: DPs: minus#(s(X),s(Y)) -> minus#(X,Y) minus#(s(X),s(Y)) -> p#(minus(X,Y)) div#(s(X),s(Y)) -> minus#(X,Y) div#(s(X),s(Y)) -> div#(minus(X,Y),s(Y)) TRS: minus(X,0()) -> X minus(s(X),s(Y)) -> p(minus(X,Y)) p(s(X)) -> X div(0(),s(Y)) -> 0() div(s(X),s(Y)) -> s(div(minus(X,Y),s(Y))) TDG Processor: DPs: minus#(s(X),s(Y)) -> minus#(X,Y) minus#(s(X),s(Y)) -> p#(minus(X,Y)) div#(s(X),s(Y)) -> minus#(X,Y) div#(s(X),s(Y)) -> div#(minus(X,Y),s(Y)) TRS: minus(X,0()) -> X minus(s(X),s(Y)) -> p(minus(X,Y)) p(s(X)) -> X div(0(),s(Y)) -> 0() div(s(X),s(Y)) -> s(div(minus(X,Y),s(Y))) graph: div#(s(X),s(Y)) -> div#(minus(X,Y),s(Y)) -> div#(s(X),s(Y)) -> div#(minus(X,Y),s(Y)) div#(s(X),s(Y)) -> div#(minus(X,Y),s(Y)) -> div#(s(X),s(Y)) -> minus#(X,Y) div#(s(X),s(Y)) -> minus#(X,Y) -> minus#(s(X),s(Y)) -> p#(minus(X,Y)) div#(s(X),s(Y)) -> minus#(X,Y) -> minus#(s(X),s(Y)) -> minus#(X,Y) minus#(s(X),s(Y)) -> minus#(X,Y) -> minus#(s(X),s(Y)) -> p#(minus(X,Y)) minus#(s(X),s(Y)) -> minus#(X,Y) -> minus#(s(X),s(Y)) -> minus#(X,Y) SCC Processor: #sccs: 2 #rules: 2 #arcs: 6/16 DPs: div#(s(X),s(Y)) -> div#(minus(X,Y),s(Y)) TRS: minus(X,0()) -> X minus(s(X),s(Y)) -> p(minus(X,Y)) p(s(X)) -> X div(0(),s(Y)) -> 0() div(s(X),s(Y)) -> s(div(minus(X,Y),s(Y))) Arctic Interpretation Processor: dimension: 1 interpretation: [div#](x0, x1) = 4x0, [div](x0, x1) = x0, [p](x0) = x0, [s](x0) = 1x0, [minus](x0, x1) = x0, [0] = 0 orientation: div#(s(X),s(Y)) = 5X >= 4X = div#(minus(X,Y),s(Y)) minus(X,0()) = X >= X = X minus(s(X),s(Y)) = 1X >= X = p(minus(X,Y)) p(s(X)) = 1X >= X = X div(0(),s(Y)) = 0 >= 0 = 0() div(s(X),s(Y)) = 1X >= 1X = s(div(minus(X,Y),s(Y))) problem: DPs: TRS: minus(X,0()) -> X minus(s(X),s(Y)) -> p(minus(X,Y)) p(s(X)) -> X div(0(),s(Y)) -> 0() div(s(X),s(Y)) -> s(div(minus(X,Y),s(Y))) Qed DPs: minus#(s(X),s(Y)) -> minus#(X,Y) TRS: minus(X,0()) -> X minus(s(X),s(Y)) -> p(minus(X,Y)) p(s(X)) -> X div(0(),s(Y)) -> 0() div(s(X),s(Y)) -> s(div(minus(X,Y),s(Y))) Subterm Criterion Processor: simple projection: pi(minus#) = 1 problem: DPs: TRS: minus(X,0()) -> X minus(s(X),s(Y)) -> p(minus(X,Y)) p(s(X)) -> X div(0(),s(Y)) -> 0() div(s(X),s(Y)) -> s(div(minus(X,Y),s(Y))) Qed