YES We show the termination of the TRS R: minus(x,|0|()) -> x minus(s(x),s(y)) -> minus(x,y) quot(|0|(),s(y)) -> |0|() quot(s(x),s(y)) -> s(quot(minus(x,y),s(y))) -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: minus#(s(x),s(y)) -> minus#(x,y) p2: quot#(s(x),s(y)) -> quot#(minus(x,y),s(y)) p3: quot#(s(x),s(y)) -> minus#(x,y) and R consists of: r1: minus(x,|0|()) -> x r2: minus(s(x),s(y)) -> minus(x,y) r3: quot(|0|(),s(y)) -> |0|() r4: quot(s(x),s(y)) -> s(quot(minus(x,y),s(y))) The estimated dependency graph contains the following SCCs: {p2} {p1} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: quot#(s(x),s(y)) -> quot#(minus(x,y),s(y)) and R consists of: r1: minus(x,|0|()) -> x r2: minus(s(x),s(y)) -> minus(x,y) r3: quot(|0|(),s(y)) -> |0|() r4: quot(s(x),s(y)) -> s(quot(minus(x,y),s(y))) The set of usable rules consists of r1, r2, r3 Take the reduction pair: generalized weighted path order (>=MG, >MG) base order 1: max/plus interpretation on natural numbers: quot#_A(x1,x2) = max{5, x1 + 4, x2 - 3} s_A(x1) = x1 + 9 minus_A(x1,x2) = max{7, x1 + 6} |0|_A = 3 quot_A(x1,x2) = max{8, x2 - 14} base order 2: precedence: quot# > s = minus > quot > |0| partial status: pi(quot#) = [1] pi(s) = [1] pi(minus) = [] pi(|0|) = [] pi(quot) = [] The following rules are removed: p1 Then no dependency pair remains. -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: minus#(s(x),s(y)) -> minus#(x,y) and R consists of: r1: minus(x,|0|()) -> x r2: minus(s(x),s(y)) -> minus(x,y) r3: quot(|0|(),s(y)) -> |0|() r4: quot(s(x),s(y)) -> s(quot(minus(x,y),s(y))) The set of usable rules consists of r3 Take the reduction pair: generalized weighted path order (>=MG, >MG) base order 1: max/plus interpretation on natural numbers: minus#_A(x1,x2) = max{5, x1 + 2} s_A(x1) = max{6, x1 + 4} quot_A(x1,x2) = max{7, x1 - 13, x2 - 11} |0|_A = 5 base order 2: precedence: quot > minus# = s > |0| partial status: pi(minus#) = [1] pi(s) = [1] pi(quot) = [] pi(|0|) = [] The following rules are removed: p1 Then no dependency pair remains.