NO Problem 1: ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: Confluence Problem: (VAR vNonEmpty) (REPLACEMENT-MAP (b) (c) (f 1) (a) (fSNonEmpty) (h 1, 2) ) (RULES b -> f(h(c,b)) c -> a f(f(f(c))) -> b ) ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: Problem 1: Problem 1: Not CS-TRS Procedure: R is not a CS-TRS Problem 1: ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: Confluence Problem: (VAR vNonEmpty) (REPLACEMENT-MAP (b) (c) (f 1) (a) (fSNonEmpty) (h 1, 2) ) (RULES b -> f(h(c,b)) c -> a f(f(f(c))) -> b ) ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: Huet Levy Ordered by Num of Vars and Symbs Procedure: -> Rules: b -> f(h(c,b)) c -> a f(f(f(c))) -> b -> Vars: -> Rlps: (rule: b -> f(h(c,b)), id: 1, possubterms: b->[]) (rule: c -> a, id: 2, possubterms: c->[]) (rule: f(f(f(c))) -> b, id: 3, possubterms: f(f(f(c)))->[], f(f(c))->[1], f(c)->[1, 1], c->[1, 1, 1]) -> Unifications: (R3 unifies with R2 at p: [1,1,1], l: f(f(f(c))), lp: c, sig: {}, l': c, r: b, r': a) -> Critical pairs info: => Not trivial, Not overlay, Proper, NW0, N1 -> Problem conclusions: Left linear, Right linear, Linear Not weakly orthogonal, Not almost orthogonal, Not orthogonal Not Huet-Levy confluent, Not Newman confluent R is a TRS Problem 1: ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: Confluence Problem: (REPLACEMENT-MAP (b) (c) (f 1) (a) (fSNonEmpty) (h 1, 2) ) (RULES b -> f(h(c,b)) c -> a f(f(f(c))) -> b ) Critical Pairs: => Not trivial, Not overlay, Proper, NW0, N1 ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: No Convergence InfChecker Procedure: Infeasible convergence? YES Problem 1: Infeasibility Problem: [(VAR vNonEmpty vNonEmpty z0) (STRATEGY CONTEXTSENSITIVE (b) (c) (f 1) (a) (fSNonEmpty) (h 1 2) ) (RULES b -> f(h(c,b)) c -> a f(f(f(c))) -> b )] Infeasibility Conditions: f(f(f(a))) ->* z0, b ->* z0 Problem 1: Obtaining a model using Mace4: -> Usable Rules: b -> f(h(c,b)) c -> a f(f(f(c))) -> b -> Mace4 Output: ============================== Mace4 ================================= Mace4 (64) version 2009-11A, November 2009. Process 2788841 was started by shintani on shintani-XPS-13-9310, Fri Jun 9 17:10:03 2023 The command was "./mace4 -c -f /tmp/mace42788824-2.in". ============================== end of head =========================== ============================== INPUT ================================= % Reading from file /tmp/mace42788824-2.in assign(max_seconds,10). formulas(assumptions). ->(x1,y) -> ->(f(x1),f(y)) # label(congruence). ->(x1,y) -> ->(h(x1,x2),h(y,x2)) # label(congruence). ->(x2,y) -> ->(h(x1,x2),h(x1,y)) # label(congruence). ->(b,f(h(c,b))) # label(replacement). ->(c,a) # label(replacement). ->(f(f(f(c))),b) # label(replacement). ->*(x,x) # label(reflexivity). ->(x,y) & ->*(y,z) -> ->*(x,z) # label(transitivity). end_of_list. formulas(goals). (exists x2 (->*(f(f(f(a))),x2) & ->*(b,x2))) # label(goal). end_of_list. ============================== end of input ========================== ============================== PROCESS NON-CLAUSAL FORMULAS ========== % Formulas that are not ordinary clauses: 1 ->(x1,y) -> ->(f(x1),f(y)) # label(congruence) # label(non_clause). [assumption]. 2 ->(x1,y) -> ->(h(x1,x2),h(y,x2)) # label(congruence) # label(non_clause). [assumption]. 3 ->(x2,y) -> ->(h(x1,x2),h(x1,y)) # label(congruence) # label(non_clause). [assumption]. 4 ->(x,y) & ->*(y,z) -> ->*(x,z) # label(transitivity) # label(non_clause). [assumption]. 5 (exists x2 (->*(f(f(f(a))),x2) & ->*(b,x2))) # label(goal) # label(non_clause) # label(goal). [goal]. ============================== end of process non-clausal formulas === ============================== CLAUSES FOR SEARCH ==================== formulas(mace4_clauses). -->(x,y) | ->(f(x),f(y)) # label(congruence). -->(x,y) | ->(h(x,z),h(y,z)) # label(congruence). -->(x,y) | ->(h(z,x),h(z,y)) # label(congruence). ->(b,f(h(c,b))) # label(replacement). ->(c,a) # label(replacement). ->(f(f(f(c))),b) # label(replacement). ->*(x,x) # label(reflexivity). -->(x,y) | -->*(y,z) | ->*(x,z) # label(transitivity). -->*(f(f(f(a))),x) | -->*(b,x) # label(goal). end_of_list. ============================== end of clauses for search ============= % There are no natural numbers in the input. ============================== DOMAIN SIZE 2 ========================= ============================== STATISTICS ============================ For domain size 2. Current CPU time: 0.00 seconds (total CPU time: 0.00 seconds). Ground clauses: seen=35, kept=31. Selections=40, assignments=79, propagations=77, current_models=0. Rewrite_terms=457, rewrite_bools=306, indexes=100. Rules_from_neg_clauses=6, cross_offs=6. ============================== end of statistics ===================== ============================== DOMAIN SIZE 3 ========================= ============================== MODEL ================================= interpretation( 3, [number=1, seconds=0], [ function(b, [ 0 ]), function(c, [ 1 ]), function(a, [ 0 ]), function(f(_), [ 2, 1, 0 ]), function(h(_,_), [ 2, 1, 0, 2, 1, 0, 2, 1, 0 ]), relation(->*(_,_), [ 1, 0, 0, 1, 1, 1, 0, 0, 1 ]), relation(->(_,_), [ 1, 0, 0, 1, 1, 1, 0, 0, 1 ]) ]). ============================== end of model ========================== ============================== STATISTICS ============================ For domain size 3. Current CPU time: 0.00 seconds (total CPU time: 0.02 seconds). Ground clauses: seen=99, kept=90. Selections=7335, assignments=20670, propagations=7115, current_models=1. Rewrite_terms=101288, rewrite_bools=86453, indexes=6045. Rules_from_neg_clauses=214, cross_offs=3637. ============================== end of statistics ===================== User_CPU=0.02, System_CPU=0.00, Wall_clock=0. Exiting with 1 model. Process 2788841 exit (max_models) Fri Jun 9 17:10:03 2023 The process finished Fri Jun 9 17:10:03 2023 Mace4 cooked interpretation: The problem is infeasible. The problem is not confluent.