YES ---- CR(R) ---- R : left-linear, C : CR and CP-closing, and Cdup/R : SN R: -(0(),0()) -> 0() -(s(x),0()) -> s(x) -(x,s(y)) -> -(d(x),y) d(s(x)) -> x -(s(x),s(y)) -> -(x,y) -(d(x),y) -> -(x,s(y)) CP(R): -(d(s(___y37)),___y36) -> -(___y37,___y36) -(d(d(___y41)),___y40) -> -(___y41,s(s(___y40))) -(___y54,___y56) -> -(s(___y54),s(___y56)) -(___y62,___y63) -> -(d(s(___y62)),___y63) -(___y82,s(s(___y85))) -> -(d(d(___y82)),___y85) critical-pair-closing system C: -(0(),0()) -> 0() -(x,s(y)) -> -(d(x),y) d(s(x)) -> x -(s(x),s(y)) -> -(x,y) CR(C): see below. ---- CR(R) ---- R : linear and strongly closed [Huet, 1980] R: -(0(),0()) -> 0() -(x,s(y)) -> -(d(x),y) d(s(x)) -> x -(s(x),s(y)) -> -(x,y) CP(R): -(d(s(___y113)),___y112) -> -(___y113,___y112) -(___y126,___y127) -> -(d(s(___y126)),___y127)