YES Consider the TRS R consisting of the following rewrite rules: +(*(x,y),*(x,z)) -> *(x,+(y,z)) +(+(x,y),z) -> +(x,+(y,z)) +(*(x,y),+(*(x,z),u)) -> +(*(x,+(y,z)),u) The TRS R is terminating because R is match-raise-bounded for RFC#'(R) by 0. A raise-consistent and quasi-deterministic tree automaton compatible with match(R) and RFC#'(R) has - 9 states (1,...,9) - 6 final states (1,4,5,7,8,9) - 14 transitions: u_0 -> 6 #_0 -> 2 *_0(2,9) -> 7 *_0(2,3) -> 7 *_0(2,7) -> 7 *_0(2,8) -> 7 +_0(2,9) -> 8 +_0(2,2) -> 3 +_0(7,6) -> 9 +_0(2,3) -> 8 +_0(2,7) -> 8 +_0(2,4) -> 8 +_0(2,8) -> 8 +_0(1,6) -> 9 ___________________________________________________________________ TTTbox (0.010 seconds) - April 13, 2007 Source file - /home/ami/mkorp/Testbench/tpdb-3.2/TRS/various/18.trs