YES Problem: half(0()) -> 0() half(s(0())) -> 0() half(s(s(x))) -> s(half(x)) inc(0()) -> 0() inc(s(x)) -> s(inc(x)) zero(0()) -> true() zero(s(x)) -> false() p(0()) -> 0() p(s(x)) -> x bits(x) -> bitIter(x,0()) bitIter(x,y) -> if(zero(x),x,inc(y)) if(true(),x,y) -> p(y) if(false(),x,y) -> bitIter(half(x),y) Proof: DP Processor: DPs: half#(s(s(x))) -> half#(x) inc#(s(x)) -> inc#(x) bits#(x) -> bitIter#(x,0()) bitIter#(x,y) -> inc#(y) bitIter#(x,y) -> zero#(x) bitIter#(x,y) -> if#(zero(x),x,inc(y)) if#(true(),x,y) -> p#(y) if#(false(),x,y) -> half#(x) if#(false(),x,y) -> bitIter#(half(x),y) TRS: half(0()) -> 0() half(s(0())) -> 0() half(s(s(x))) -> s(half(x)) inc(0()) -> 0() inc(s(x)) -> s(inc(x)) zero(0()) -> true() zero(s(x)) -> false() p(0()) -> 0() p(s(x)) -> x bits(x) -> bitIter(x,0()) bitIter(x,y) -> if(zero(x),x,inc(y)) if(true(),x,y) -> p(y) if(false(),x,y) -> bitIter(half(x),y) TDG Processor: DPs: half#(s(s(x))) -> half#(x) inc#(s(x)) -> inc#(x) bits#(x) -> bitIter#(x,0()) bitIter#(x,y) -> inc#(y) bitIter#(x,y) -> zero#(x) bitIter#(x,y) -> if#(zero(x),x,inc(y)) if#(true(),x,y) -> p#(y) if#(false(),x,y) -> half#(x) if#(false(),x,y) -> bitIter#(half(x),y) TRS: half(0()) -> 0() half(s(0())) -> 0() half(s(s(x))) -> s(half(x)) inc(0()) -> 0() inc(s(x)) -> s(inc(x)) zero(0()) -> true() zero(s(x)) -> false() p(0()) -> 0() p(s(x)) -> x bits(x) -> bitIter(x,0()) bitIter(x,y) -> if(zero(x),x,inc(y)) if(true(),x,y) -> p(y) if(false(),x,y) -> bitIter(half(x),y) graph: if#(false(),x,y) -> bitIter#(half(x),y) -> bitIter#(x,y) -> if#(zero(x),x,inc(y)) if#(false(),x,y) -> bitIter#(half(x),y) -> bitIter#(x,y) -> zero#(x) if#(false(),x,y) -> bitIter#(half(x),y) -> bitIter#(x,y) -> inc#(y) if#(false(),x,y) -> half#(x) -> half#(s(s(x))) -> half#(x) bitIter#(x,y) -> if#(zero(x),x,inc(y)) -> if#(false(),x,y) -> bitIter#(half(x),y) bitIter#(x,y) -> if#(zero(x),x,inc(y)) -> if#(false(),x,y) -> half#(x) bitIter#(x,y) -> if#(zero(x),x,inc(y)) -> if#(true(),x,y) -> p#(y) bitIter#(x,y) -> inc#(y) -> inc#(s(x)) -> inc#(x) bits#(x) -> bitIter#(x,0()) -> bitIter#(x,y) -> if#(zero(x),x,inc(y)) bits#(x) -> bitIter#(x,0()) -> bitIter#(x,y) -> zero#(x) bits#(x) -> bitIter#(x,0()) -> bitIter#(x,y) -> inc#(y) inc#(s(x)) -> inc#(x) -> inc#(s(x)) -> inc#(x) half#(s(s(x))) -> half#(x) -> half#(s(s(x))) -> half#(x) SCC Processor: #sccs: 3 #rules: 4 #arcs: 13/81 DPs: if#(false(),x,y) -> bitIter#(half(x),y) bitIter#(x,y) -> if#(zero(x),x,inc(y)) TRS: half(0()) -> 0() half(s(0())) -> 0() half(s(s(x))) -> s(half(x)) inc(0()) -> 0() inc(s(x)) -> s(inc(x)) zero(0()) -> true() zero(s(x)) -> false() p(0()) -> 0() p(s(x)) -> x bits(x) -> bitIter(x,0()) bitIter(x,y) -> if(zero(x),x,inc(y)) if(true(),x,y) -> p(y) if(false(),x,y) -> bitIter(half(x),y) Matrix Interpretation Processor: dim=1 interpretation: [if#](x0, x1, x2) = 3/2x0 + 3/2x1 + 2x2, [bitIter#](x0, x1) = 3x0 + 2x1 + 1/2, [if](x0, x1, x2) = x1 + 1/2x2 + 7/2, [bitIter](x0, x1) = x0 + 1/2x1 + 7/2, [bits](x0) = 2x0 + 7/2, [p](x0) = 1/2x0 + 2, [false] = 3, [true] = 0, [zero](x0) = x0, [inc](x0) = x0, [s](x0) = 2x0 + 3, [half](x0) = 1/2x0, [0] = 0 orientation: if#(false(),x,y) = 3/2x + 2y + 9/2 >= 3/2x + 2y + 1/2 = bitIter#(half(x),y) bitIter#(x,y) = 3x + 2y + 1/2 >= 3x + 2y = if#(zero(x),x,inc(y)) half(0()) = 0 >= 0 = 0() half(s(0())) = 3/2 >= 0 = 0() half(s(s(x))) = 2x + 9/2 >= x + 3 = s(half(x)) inc(0()) = 0 >= 0 = 0() inc(s(x)) = 2x + 3 >= 2x + 3 = s(inc(x)) zero(0()) = 0 >= 0 = true() zero(s(x)) = 2x + 3 >= 3 = false() p(0()) = 2 >= 0 = 0() p(s(x)) = x + 7/2 >= x = x bits(x) = 2x + 7/2 >= x + 7/2 = bitIter(x,0()) bitIter(x,y) = x + 1/2y + 7/2 >= x + 1/2y + 7/2 = if(zero(x),x,inc(y)) if(true(),x,y) = x + 1/2y + 7/2 >= 1/2y + 2 = p(y) if(false(),x,y) = x + 1/2y + 7/2 >= 1/2x + 1/2y + 7/2 = bitIter(half(x),y) problem: DPs: TRS: half(0()) -> 0() half(s(0())) -> 0() half(s(s(x))) -> s(half(x)) inc(0()) -> 0() inc(s(x)) -> s(inc(x)) zero(0()) -> true() zero(s(x)) -> false() p(0()) -> 0() p(s(x)) -> x bits(x) -> bitIter(x,0()) bitIter(x,y) -> if(zero(x),x,inc(y)) if(true(),x,y) -> p(y) if(false(),x,y) -> bitIter(half(x),y) Qed DPs: half#(s(s(x))) -> half#(x) TRS: half(0()) -> 0() half(s(0())) -> 0() half(s(s(x))) -> s(half(x)) inc(0()) -> 0() inc(s(x)) -> s(inc(x)) zero(0()) -> true() zero(s(x)) -> false() p(0()) -> 0() p(s(x)) -> x bits(x) -> bitIter(x,0()) bitIter(x,y) -> if(zero(x),x,inc(y)) if(true(),x,y) -> p(y) if(false(),x,y) -> bitIter(half(x),y) KBO Processor: argument filtering: pi(0) = [] pi(half) = 0 pi(s) = [0] pi(inc) = 0 pi(zero) = [] pi(true) = [] pi(false) = [] pi(p) = 0 pi(bits) = [] pi(bitIter) = 1 pi(if) = 2 pi(half#) = 0 weight function: w0 = 1 w(half#) = w(if) = w(bitIter) = w(bits) = w(p) = w(false) = w(true) = w( zero) = w(inc) = w(s) = w(0) = 1 w(half) = 0 precedence: inc > zero > bits > half# ~ if ~ bitIter ~ p ~ false ~ true ~ s ~ half ~ 0 problem: DPs: TRS: half(0()) -> 0() half(s(0())) -> 0() half(s(s(x))) -> s(half(x)) inc(0()) -> 0() inc(s(x)) -> s(inc(x)) zero(0()) -> true() zero(s(x)) -> false() p(0()) -> 0() p(s(x)) -> x bits(x) -> bitIter(x,0()) bitIter(x,y) -> if(zero(x),x,inc(y)) if(true(),x,y) -> p(y) if(false(),x,y) -> bitIter(half(x),y) Qed DPs: inc#(s(x)) -> inc#(x) TRS: half(0()) -> 0() half(s(0())) -> 0() half(s(s(x))) -> s(half(x)) inc(0()) -> 0() inc(s(x)) -> s(inc(x)) zero(0()) -> true() zero(s(x)) -> false() p(0()) -> 0() p(s(x)) -> x bits(x) -> bitIter(x,0()) bitIter(x,y) -> if(zero(x),x,inc(y)) if(true(),x,y) -> p(y) if(false(),x,y) -> bitIter(half(x),y) KBO Processor: argument filtering: pi(0) = [] pi(half) = [0] pi(s) = [0] pi(inc) = 0 pi(zero) = 0 pi(true) = [] pi(false) = [] pi(p) = 0 pi(bits) = [] pi(bitIter) = 1 pi(if) = 2 pi(inc#) = 0 weight function: w0 = 1 w(inc#) = w(if) = w(bitIter) = w(bits) = w(p) = w(false) = w(true) = w( zero) = w(inc) = w(s) = w(half) = w(0) = 1 precedence: bitIter > inc# ~ s ~ half > bits > 0 > if ~ p ~ false ~ true ~ zero ~ inc problem: DPs: TRS: half(0()) -> 0() half(s(0())) -> 0() half(s(s(x))) -> s(half(x)) inc(0()) -> 0() inc(s(x)) -> s(inc(x)) zero(0()) -> true() zero(s(x)) -> false() p(0()) -> 0() p(s(x)) -> x bits(x) -> bitIter(x,0()) bitIter(x,y) -> if(zero(x),x,inc(y)) if(true(),x,y) -> p(y) if(false(),x,y) -> bitIter(half(x),y) Qed