YES We show the termination of the TRS R: *(x,*(y,z)) -> *(otimes(x,y),z) *(|1|(),y) -> y *(+(x,y),z) -> oplus(*(x,z),*(y,z)) *(x,oplus(y,z)) -> oplus(*(x,y),*(x,z)) -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: *#(x,*(y,z)) -> *#(otimes(x,y),z) p2: *#(+(x,y),z) -> *#(x,z) p3: *#(+(x,y),z) -> *#(y,z) p4: *#(x,oplus(y,z)) -> *#(x,y) p5: *#(x,oplus(y,z)) -> *#(x,z) and R consists of: r1: *(x,*(y,z)) -> *(otimes(x,y),z) r2: *(|1|(),y) -> y r3: *(+(x,y),z) -> oplus(*(x,z),*(y,z)) r4: *(x,oplus(y,z)) -> oplus(*(x,y),*(x,z)) The estimated dependency graph contains the following SCCs: {p1, p2, p3, p4, p5} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: *#(x,*(y,z)) -> *#(otimes(x,y),z) p2: *#(x,oplus(y,z)) -> *#(x,z) p3: *#(x,oplus(y,z)) -> *#(x,y) p4: *#(+(x,y),z) -> *#(y,z) p5: *#(+(x,y),z) -> *#(x,z) and R consists of: r1: *(x,*(y,z)) -> *(otimes(x,y),z) r2: *(|1|(),y) -> y r3: *(+(x,y),z) -> oplus(*(x,z),*(y,z)) r4: *(x,oplus(y,z)) -> oplus(*(x,y),*(x,z)) The set of usable rules consists of (no rules) Take the reduction pair: weighted path order base order: max/plus interpretations on natural numbers: *#_A(x1,x2) = x2 + 1 *_A(x1,x2) = max{x1, x2} otimes_A(x1,x2) = max{x1 - 1, x2 + 2} oplus_A(x1,x2) = max{x1, x2 + 1} +_A(x1,x2) = max{x1 + 2, x2} precedence: *# = * = otimes = oplus = + partial status: pi(*#) = [] pi(*) = [1, 2] pi(otimes) = [2] pi(oplus) = [1, 2] pi(+) = [2] The next rules are strictly ordered: p2 We remove them from the problem. -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: *#(x,*(y,z)) -> *#(otimes(x,y),z) p2: *#(x,oplus(y,z)) -> *#(x,y) p3: *#(+(x,y),z) -> *#(y,z) p4: *#(+(x,y),z) -> *#(x,z) and R consists of: r1: *(x,*(y,z)) -> *(otimes(x,y),z) r2: *(|1|(),y) -> y r3: *(+(x,y),z) -> oplus(*(x,z),*(y,z)) r4: *(x,oplus(y,z)) -> oplus(*(x,y),*(x,z)) The estimated dependency graph contains the following SCCs: {p1, p2, p3, p4} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: *#(x,*(y,z)) -> *#(otimes(x,y),z) p2: *#(x,oplus(y,z)) -> *#(x,y) p3: *#(+(x,y),z) -> *#(x,z) p4: *#(+(x,y),z) -> *#(y,z) and R consists of: r1: *(x,*(y,z)) -> *(otimes(x,y),z) r2: *(|1|(),y) -> y r3: *(+(x,y),z) -> oplus(*(x,z),*(y,z)) r4: *(x,oplus(y,z)) -> oplus(*(x,y),*(x,z)) The set of usable rules consists of (no rules) Take the reduction pair: weighted path order base order: max/plus interpretations on natural numbers: *#_A(x1,x2) = max{2, x2 + 1} *_A(x1,x2) = max{x1 + 4, x2 + 4} otimes_A(x1,x2) = max{x1 + 1, x2 + 6} oplus_A(x1,x2) = max{x1, x2 + 1} +_A(x1,x2) = max{x1 + 1, x2} precedence: *# = * = otimes = oplus = + partial status: pi(*#) = [] pi(*) = [1, 2] pi(otimes) = [2] pi(oplus) = [2] pi(+) = [2] The next rules are strictly ordered: p1 We remove them from the problem. -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: *#(x,oplus(y,z)) -> *#(x,y) p2: *#(+(x,y),z) -> *#(x,z) p3: *#(+(x,y),z) -> *#(y,z) and R consists of: r1: *(x,*(y,z)) -> *(otimes(x,y),z) r2: *(|1|(),y) -> y r3: *(+(x,y),z) -> oplus(*(x,z),*(y,z)) r4: *(x,oplus(y,z)) -> oplus(*(x,y),*(x,z)) 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: *#(x,oplus(y,z)) -> *#(x,y) p2: *#(+(x,y),z) -> *#(y,z) p3: *#(+(x,y),z) -> *#(x,z) and R consists of: r1: *(x,*(y,z)) -> *(otimes(x,y),z) r2: *(|1|(),y) -> y r3: *(+(x,y),z) -> oplus(*(x,z),*(y,z)) r4: *(x,oplus(y,z)) -> oplus(*(x,y),*(x,z)) The set of usable rules consists of (no rules) Take the reduction pair: weighted path order base order: max/plus interpretations on natural numbers: *#_A(x1,x2) = max{0, x1 - 2} oplus_A(x1,x2) = max{x1 + 1, x2} +_A(x1,x2) = max{3, x1, x2 + 1} precedence: *# = oplus = + partial status: pi(*#) = [] pi(oplus) = [2] pi(+) = [2] The next rules are strictly ordered: p2 We remove them from the problem. -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: *#(x,oplus(y,z)) -> *#(x,y) p2: *#(+(x,y),z) -> *#(x,z) and R consists of: r1: *(x,*(y,z)) -> *(otimes(x,y),z) r2: *(|1|(),y) -> y r3: *(+(x,y),z) -> oplus(*(x,z),*(y,z)) r4: *(x,oplus(y,z)) -> oplus(*(x,y),*(x,z)) The estimated dependency graph contains the following SCCs: {p1, p2} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: *#(x,oplus(y,z)) -> *#(x,y) p2: *#(+(x,y),z) -> *#(x,z) and R consists of: r1: *(x,*(y,z)) -> *(otimes(x,y),z) r2: *(|1|(),y) -> y r3: *(+(x,y),z) -> oplus(*(x,z),*(y,z)) r4: *(x,oplus(y,z)) -> oplus(*(x,y),*(x,z)) The set of usable rules consists of (no rules) Take the reduction pair: weighted path order base order: max/plus interpretations on natural numbers: *#_A(x1,x2) = max{0, x2 - 2} oplus_A(x1,x2) = max{x1 + 1, x2 + 3} +_A(x1,x2) = x1 precedence: *# = oplus = + partial status: pi(*#) = [] pi(oplus) = [2] pi(+) = [1] The next rules are strictly ordered: p1 We remove them from the problem. -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: *#(+(x,y),z) -> *#(x,z) and R consists of: r1: *(x,*(y,z)) -> *(otimes(x,y),z) r2: *(|1|(),y) -> y r3: *(+(x,y),z) -> oplus(*(x,z),*(y,z)) r4: *(x,oplus(y,z)) -> oplus(*(x,y),*(x,z)) The estimated dependency graph contains the following SCCs: {p1} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: *#(+(x,y),z) -> *#(x,z) and R consists of: r1: *(x,*(y,z)) -> *(otimes(x,y),z) r2: *(|1|(),y) -> y r3: *(+(x,y),z) -> oplus(*(x,z),*(y,z)) r4: *(x,oplus(y,z)) -> oplus(*(x,y),*(x,z)) The set of usable rules consists of (no rules) Take the reduction pair: weighted path order base order: max/plus interpretations on natural numbers: *#_A(x1,x2) = max{x1, x2 + 1} +_A(x1,x2) = max{x1 + 1, x2} precedence: *# = + partial status: pi(*#) = [1] pi(+) = [2] The next rules are strictly ordered: p1 We remove them from the problem. Then no dependency pair remains.