NO Prover = TRS(tech=GUIDED_UNF, nb_unfoldings=unlimited, unfold_variables=true, strategy=LEFTMOST_NE) ** BEGIN proof argument ** The following rule was generated while unfolding the analyzed TRS: [iteration = 3] h(g(0,_0),1) -> h(g(0,_0),_0) Let l be the left-hand side and r be the right-hand side of this rule. Let p = epsilon, theta1 = {_0->1} and theta2 = {}. We have r|p = h(g(0,_0),_0) and theta2(theta1(l)) = theta1(r|p). Hence, the term theta1(l) = h(g(0,1),1) loops w.r.t. the analyzed TRS. ** END proof argument ** ** BEGIN proof description ** ## Searching for a generalized rewrite rule (a rule whose right-hand side contains a variable that does not occur in the left-hand side)... No generalized rewrite rule found! ## Searching for a loop by unfolding (unfolding of variable subterms: ON)... # Iteration 0: no loop detected, 2 unfolded rules generated. # Iteration 1: no loop detected, 4 unfolded rules generated. # Iteration 2: no loop detected, 9 unfolded rules generated. # Iteration 3: loop detected, 11 unfolded rules generated. Here is the successful unfolding. Let IR be the TRS under analysis. L0 = [h^#(_0,_1) -> f^#(_0,_1,_0), f^#(0,1,_2) -> h^#(_2,_2)] is in U_IR^0. Let p0 = [0]. We unfold the second rule of L0 backwards at position p0 with the rule g(_0,_1) -> _0. ==> L1 = [h^#(_0,_1) -> f^#(_0,_1,_0), f^#(g(0,_2),1,_3) -> h^#(_3,_3)] is in U_IR^1. We merge the first and the second rule of L1. ==> L2 = h^#(g(0,_0),1) -> h^#(g(0,_0),g(0,_0)) is in U_IR^2. Let p2 = [1]. We unfold the rule of L2 forwards at position p2 with the rule g(_0,_1) -> _1. ==> L3 = h^#(g(0,1),1) -> h^#(g(0,1),1) is in U_IR^3. ** END proof description ** Proof stopped at iteration 3 Number of unfolded rules generated by this proof = 26 Number of unfolded rules generated by all the parallel proofs = 28