YES We show the termination of the TRS R: D(t()) -> |1|() D(constant()) -> |0|() D(+(x,y)) -> +(D(x),D(y)) D(*(x,y)) -> +(*(y,D(x)),*(x,D(y))) D(-(x,y)) -> -(D(x),D(y)) -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: D#(+(x,y)) -> D#(x) p2: D#(+(x,y)) -> D#(y) p3: D#(*(x,y)) -> D#(x) p4: D#(*(x,y)) -> D#(y) p5: D#(-(x,y)) -> D#(x) p6: D#(-(x,y)) -> D#(y) and R consists of: r1: D(t()) -> |1|() r2: D(constant()) -> |0|() r3: D(+(x,y)) -> +(D(x),D(y)) r4: D(*(x,y)) -> +(*(y,D(x)),*(x,D(y))) r5: D(-(x,y)) -> -(D(x),D(y)) The estimated dependency graph contains the following SCCs: {p1, p2, p3, p4, p5, p6} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: D#(+(x,y)) -> D#(x) p2: D#(-(x,y)) -> D#(y) p3: D#(-(x,y)) -> D#(x) p4: D#(*(x,y)) -> D#(y) p5: D#(*(x,y)) -> D#(x) p6: D#(+(x,y)) -> D#(y) and R consists of: r1: D(t()) -> |1|() r2: D(constant()) -> |0|() r3: D(+(x,y)) -> +(D(x),D(y)) r4: D(*(x,y)) -> +(*(y,D(x)),*(x,D(y))) r5: D(-(x,y)) -> -(D(x),D(y)) The set of usable rules consists of (no rules) Take the reduction pair: generalized weighted path order (>=MG, >G) base order 1: matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: D#_A(x1) = x1 +_A(x1,x2) = x1 + x2 + 2 -_A(x1,x2) = x1 + x2 + 2 *_A(x1,x2) = x1 + x2 + 2 base order 2: marked-algebra reduction triple (>=A, >=A!, >A!): max/plus interpretation on natural numbers: D#_A(x1) = 0 +_A(x1,x2) = max{7, x1 - 16, x2 - 16} -_A(x1,x2) = max{7, x1 - 28, x2 - 28} *_A(x1,x2) = max{x1 - 4, x2 + 13} D#!_A(x1) = max{4, x1 - 8} +!_A(x1,x2) = max{3, x1 - 39, x2 - 23} -!_A(x1,x2) = max{2, x1 - 54, x2 - 57} *!_A(x1,x2) = max{2, x1 - 7, x2 - 59} partial status: pi(D#) = [1] pi(+) = [] pi(-) = [2] pi(*) = [2] The following rules are removed: p1, p2, p3, p4, p5, p6 Then no dependency pair remains.