YES We show the termination of the TRS R: *(i(x),x) -> |1|() *(|1|(),y) -> y *(x,|0|()) -> |0|() *(*(x,y),z) -> *(x,*(y,z)) -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: *#(*(x,y),z) -> *#(x,*(y,z)) p2: *#(*(x,y),z) -> *#(y,z) and R consists of: r1: *(i(x),x) -> |1|() r2: *(|1|(),y) -> y r3: *(x,|0|()) -> |0|() r4: *(*(x,y),z) -> *(x,*(y,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,y),z) -> *#(x,*(y,z)) p2: *#(*(x,y),z) -> *#(y,z) and R consists of: r1: *(i(x),x) -> |1|() r2: *(|1|(),y) -> y r3: *(x,|0|()) -> |0|() r4: *(*(x,y),z) -> *(x,*(y,z)) The set of usable rules consists of r1, r2, r3, r4 Take the reduction pair: weighted path order base order: matrix interpretations: carrier: N^2 order: standard order interpretations: *#_A(x1,x2) = ((1,1),(1,1)) x1 + ((0,1),(0,1)) x2 + (2,2) *_A(x1,x2) = ((1,1),(1,1)) x1 + x2 + (1,1) i_A(x1) = ((1,1),(1,1)) x1 + (2,1) |1|_A() = (1,2) |0|_A() = (1,1) precedence: *# = * = i = |1| = |0| partial status: pi(*#) = [] pi(*) = [] pi(i) = [] pi(|1|) = [] pi(|0|) = [] 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) -> *#(x,*(y,z)) and R consists of: r1: *(i(x),x) -> |1|() r2: *(|1|(),y) -> y r3: *(x,|0|()) -> |0|() r4: *(*(x,y),z) -> *(x,*(y,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,*(y,z)) and R consists of: r1: *(i(x),x) -> |1|() r2: *(|1|(),y) -> y r3: *(x,|0|()) -> |0|() r4: *(*(x,y),z) -> *(x,*(y,z)) The set of usable rules consists of r1, r2, r3, r4 Take the reduction pair: weighted path order base order: matrix interpretations: carrier: N^2 order: standard order interpretations: *#_A(x1,x2) = ((1,1),(0,1)) x1 + ((0,1),(0,1)) x2 + (1,1) *_A(x1,x2) = x1 + x2 + (1,1) i_A(x1) = ((1,1),(1,1)) x1 |1|_A() = (0,0) |0|_A() = (1,1) precedence: * = i > *# = |1| > |0| partial status: pi(*#) = [1] pi(*) = [] pi(i) = [] pi(|1|) = [] pi(|0|) = [] The next rules are strictly ordered: p1 We remove them from the problem. Then no dependency pair remains.