YES We show the termination of the TRS R: active(f(X)) -> mark(g(h(f(X)))) mark(f(X)) -> active(f(mark(X))) mark(g(X)) -> active(g(X)) mark(h(X)) -> active(h(mark(X))) f(mark(X)) -> f(X) f(active(X)) -> f(X) g(mark(X)) -> g(X) g(active(X)) -> g(X) h(mark(X)) -> h(X) h(active(X)) -> h(X) -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: active#(f(X)) -> mark#(g(h(f(X)))) p2: active#(f(X)) -> g#(h(f(X))) p3: active#(f(X)) -> h#(f(X)) p4: mark#(f(X)) -> active#(f(mark(X))) p5: mark#(f(X)) -> f#(mark(X)) p6: mark#(f(X)) -> mark#(X) p7: mark#(g(X)) -> active#(g(X)) p8: mark#(h(X)) -> active#(h(mark(X))) p9: mark#(h(X)) -> h#(mark(X)) p10: mark#(h(X)) -> mark#(X) p11: f#(mark(X)) -> f#(X) p12: f#(active(X)) -> f#(X) p13: g#(mark(X)) -> g#(X) p14: g#(active(X)) -> g#(X) p15: h#(mark(X)) -> h#(X) p16: h#(active(X)) -> h#(X) and R consists of: r1: active(f(X)) -> mark(g(h(f(X)))) r2: mark(f(X)) -> active(f(mark(X))) r3: mark(g(X)) -> active(g(X)) r4: mark(h(X)) -> active(h(mark(X))) r5: f(mark(X)) -> f(X) r6: f(active(X)) -> f(X) r7: g(mark(X)) -> g(X) r8: g(active(X)) -> g(X) r9: h(mark(X)) -> h(X) r10: h(active(X)) -> h(X) The estimated dependency graph contains the following SCCs: {p1, p4, p6, p7, p8, p10} {p13, p14} {p15, p16} {p11, p12} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: active#(f(X)) -> mark#(g(h(f(X)))) p2: mark#(h(X)) -> mark#(X) p3: mark#(h(X)) -> active#(h(mark(X))) p4: mark#(g(X)) -> active#(g(X)) p5: mark#(f(X)) -> mark#(X) p6: mark#(f(X)) -> active#(f(mark(X))) and R consists of: r1: active(f(X)) -> mark(g(h(f(X)))) r2: mark(f(X)) -> active(f(mark(X))) r3: mark(g(X)) -> active(g(X)) r4: mark(h(X)) -> active(h(mark(X))) r5: f(mark(X)) -> f(X) r6: f(active(X)) -> f(X) r7: g(mark(X)) -> g(X) r8: g(active(X)) -> g(X) r9: h(mark(X)) -> h(X) r10: h(active(X)) -> h(X) The set of usable rules consists of r1, r2, r3, r4, r5, r6, r7, r8, r9, r10 Take the reduction pair: lexicographic combination of reduction pairs: 1. lexicographic path order with precedence: precedence: h > g > mark > active > f > active# > mark# argument filter: pi(active#) = 1 pi(f) = [1] pi(mark#) = 1 pi(g) = 1 pi(h) = 1 pi(mark) = 1 pi(active) = 1 2. matrix interpretations: carrier: N^4 order: lexicographic order interpretations: active#_A(x1) = ((1,0,0,0),(0,1,0,0),(1,0,1,0),(0,0,0,0)) x1 f_A(x1) = (2,5,1,1) mark#_A(x1) = (2,5,3,0) g_A(x1) = ((0,0,0,0),(1,0,0,0),(1,0,0,0),(1,1,0,0)) x1 + (1,0,0,1) h_A(x1) = ((0,0,0,0),(1,0,0,0),(0,1,0,0),(1,0,1,0)) x1 + (1,1,0,1) mark_A(x1) = ((1,0,0,0),(1,1,0,0),(1,1,0,0),(1,1,1,0)) x1 + (2,4,1,0) active_A(x1) = ((1,0,0,0),(1,1,0,0),(0,0,1,0),(1,1,1,1)) x1 + (1,0,0,0) The next rules are strictly ordered: p3, p4, p5 We remove them from the problem. -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: active#(f(X)) -> mark#(g(h(f(X)))) p2: mark#(h(X)) -> mark#(X) p3: mark#(f(X)) -> active#(f(mark(X))) and R consists of: r1: active(f(X)) -> mark(g(h(f(X)))) r2: mark(f(X)) -> active(f(mark(X))) r3: mark(g(X)) -> active(g(X)) r4: mark(h(X)) -> active(h(mark(X))) r5: f(mark(X)) -> f(X) r6: f(active(X)) -> f(X) r7: g(mark(X)) -> g(X) r8: g(active(X)) -> g(X) r9: h(mark(X)) -> h(X) r10: h(active(X)) -> h(X) The estimated dependency graph contains the following SCCs: {p1, p2, p3} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: active#(f(X)) -> mark#(g(h(f(X)))) p2: mark#(f(X)) -> active#(f(mark(X))) p3: mark#(h(X)) -> mark#(X) and R consists of: r1: active(f(X)) -> mark(g(h(f(X)))) r2: mark(f(X)) -> active(f(mark(X))) r3: mark(g(X)) -> active(g(X)) r4: mark(h(X)) -> active(h(mark(X))) r5: f(mark(X)) -> f(X) r6: f(active(X)) -> f(X) r7: g(mark(X)) -> g(X) r8: g(active(X)) -> g(X) r9: h(mark(X)) -> h(X) r10: h(active(X)) -> h(X) The set of usable rules consists of r1, r2, r3, r4, r5, r6, r7, r8, r9, r10 Take the reduction pair: lexicographic combination of reduction pairs: 1. lexicographic path order with precedence: precedence: mark > active > active# > mark# > f > h > g argument filter: pi(active#) = 1 pi(f) = [1] pi(mark#) = 1 pi(g) = [] pi(h) = [1] pi(mark) = 1 pi(active) = 1 2. matrix interpretations: carrier: N^4 order: lexicographic order interpretations: active#_A(x1) = ((1,0,0,0),(1,1,0,0),(0,1,0,0),(0,0,1,0)) x1 f_A(x1) = ((1,0,0,0),(1,1,0,0),(1,1,1,0),(1,1,1,1)) x1 + (5,1,1,1) mark#_A(x1) = ((1,0,0,0),(1,1,0,0),(1,1,1,0),(1,0,1,1)) x1 + (5,3,0,0) g_A(x1) = (1,3,1,1) h_A(x1) = ((1,0,0,0),(0,1,0,0),(1,1,1,0),(1,1,1,1)) x1 + (3,1,1,1) mark_A(x1) = ((1,0,0,0),(1,1,0,0),(0,0,0,0),(0,0,1,0)) x1 + (1,0,2,9) active_A(x1) = ((1,0,0,0),(0,1,0,0),(0,0,0,0),(1,0,1,0)) x1 + (0,2,1,1) The next rules are strictly ordered: p1, p2, p3 We remove them from the problem. Then no dependency pair remains. -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: g#(mark(X)) -> g#(X) p2: g#(active(X)) -> g#(X) and R consists of: r1: active(f(X)) -> mark(g(h(f(X)))) r2: mark(f(X)) -> active(f(mark(X))) r3: mark(g(X)) -> active(g(X)) r4: mark(h(X)) -> active(h(mark(X))) r5: f(mark(X)) -> f(X) r6: f(active(X)) -> f(X) r7: g(mark(X)) -> g(X) r8: g(active(X)) -> g(X) r9: h(mark(X)) -> h(X) r10: h(active(X)) -> h(X) The set of usable rules consists of (no rules) Take the reduction pair: lexicographic combination of reduction pairs: 1. lexicographic path order with precedence: precedence: mark > g# > active argument filter: pi(g#) = [1] pi(mark) = [1] pi(active) = [1] 2. matrix interpretations: carrier: N^4 order: lexicographic order interpretations: g#_A(x1) = ((1,0,0,0),(1,1,0,0),(0,0,1,0),(1,1,1,1)) x1 mark_A(x1) = ((0,0,0,0),(1,0,0,0),(1,1,0,0),(0,1,1,0)) x1 + (1,1,1,1) active_A(x1) = ((1,0,0,0),(1,1,0,0),(1,1,1,0),(1,1,1,1)) x1 + (1,1,1,1) The next rules are strictly ordered: p1, p2 We remove them from the problem. Then no dependency pair remains. -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: h#(mark(X)) -> h#(X) p2: h#(active(X)) -> h#(X) and R consists of: r1: active(f(X)) -> mark(g(h(f(X)))) r2: mark(f(X)) -> active(f(mark(X))) r3: mark(g(X)) -> active(g(X)) r4: mark(h(X)) -> active(h(mark(X))) r5: f(mark(X)) -> f(X) r6: f(active(X)) -> f(X) r7: g(mark(X)) -> g(X) r8: g(active(X)) -> g(X) r9: h(mark(X)) -> h(X) r10: h(active(X)) -> h(X) The set of usable rules consists of (no rules) Take the reduction pair: lexicographic combination of reduction pairs: 1. lexicographic path order with precedence: precedence: active > mark > h# argument filter: pi(h#) = [1] pi(mark) = [1] pi(active) = 1 2. matrix interpretations: carrier: N^4 order: lexicographic order interpretations: h#_A(x1) = ((1,0,0,0),(1,1,0,0),(0,0,1,0),(1,1,1,1)) x1 mark_A(x1) = ((0,0,0,0),(1,0,0,0),(1,1,0,0),(1,1,1,0)) x1 + (1,1,1,1) active_A(x1) = ((1,0,0,0),(1,1,0,0),(1,1,1,0),(1,1,1,1)) x1 + (1,1,1,1) The next rules are strictly ordered: p1, p2 We remove them from the problem. Then no dependency pair remains. -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: f#(mark(X)) -> f#(X) p2: f#(active(X)) -> f#(X) and R consists of: r1: active(f(X)) -> mark(g(h(f(X)))) r2: mark(f(X)) -> active(f(mark(X))) r3: mark(g(X)) -> active(g(X)) r4: mark(h(X)) -> active(h(mark(X))) r5: f(mark(X)) -> f(X) r6: f(active(X)) -> f(X) r7: g(mark(X)) -> g(X) r8: g(active(X)) -> g(X) r9: h(mark(X)) -> h(X) r10: h(active(X)) -> h(X) The set of usable rules consists of (no rules) Take the monotone reduction pair: lexicographic combination of reduction pairs: 1. lexicographic path order with precedence: precedence: active > mark > f# argument filter: pi(f#) = 1 pi(mark) = 1 pi(active) = 1 2. matrix interpretations: carrier: N^4 order: lexicographic order interpretations: f#_A(x1) = ((1,0,0,0),(1,1,0,0),(1,1,1,0),(1,1,1,1)) x1 mark_A(x1) = ((1,0,0,0),(1,1,0,0),(1,1,1,0),(0,0,1,1)) x1 active_A(x1) = ((1,0,0,0),(1,1,0,0),(1,1,1,0),(1,1,1,1)) x1 + (1,1,1,1) The next rules are strictly ordered: p2 r1, r2, r3, r4, r5, r6, r7, r8, r9, r10 We remove them from the problem. -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: f#(mark(X)) -> f#(X) and R consists of: (no rules) The estimated dependency graph contains the following SCCs: {p1} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: f#(mark(X)) -> f#(X) and R consists of: (no rules) The set of usable rules consists of (no rules) Take the monotone reduction pair: lexicographic combination of reduction pairs: 1. lexicographic path order with precedence: precedence: mark > f# argument filter: pi(f#) = 1 pi(mark) = [1] 2. matrix interpretations: carrier: N^4 order: lexicographic order interpretations: f#_A(x1) = ((1,0,0,0),(0,1,0,0),(0,0,1,0),(1,1,1,1)) x1 mark_A(x1) = ((1,0,0,0),(1,1,0,0),(1,1,1,0),(1,0,1,1)) x1 + (1,1,1,1) The next rules are strictly ordered: p1 We remove them from the problem. Then no dependency pair remains.