NO Initial ITS Start location: l4 0: l0 -> l1 : v^0'=v^post0, pre_v^0'=pre_v^post0, v_next^0'=v_next^post0, (v_next^0-v_next^post0 == 0 /\ 1+v^0-v_next^0 <= 0 /\ pre_v^0-pre_v^post0 == 0 /\ v^0-v^post0 == 0), cost: 1 1: l0 -> l2 : v^0'=v^post1, pre_v^0'=pre_v^post1, v_next^0'=v_next^post1, (v_next^0-v_next^post1 == 0 /\ pre_v^0-pre_v^post1 == 0 /\ v^0-v^post1 == 0), cost: 1 2: l2 -> l0 : v^0'=v^post2, pre_v^0'=pre_v^post2, v_next^0'=v_next^post2, (0 == 0 /\ -1-v^10+v^post2 == 0 /\ -v^0+pre_v^post2 == 0 /\ v^10-v_next^post2 == 0), cost: 1 3: l3 -> l2 : v^0'=v^post3, pre_v^0'=pre_v^post3, v_next^0'=v_next^post3, (-pre_v^post3+pre_v^0 == 0 /\ -v_next^post3+v_next^0 == 0 /\ -v^post3+v^0 == 0), cost: 1 4: l4 -> l3 : v^0'=v^post4, pre_v^0'=pre_v^post4, v_next^0'=v_next^post4, (-pre_v^post4+pre_v^0 == 0 /\ -v_next^post4+v_next^0 == 0 /\ -v^post4+v^0 == 0), cost: 1 Removed unreachable rules and leafs Start location: l4 1: l0 -> l2 : v^0'=v^post1, pre_v^0'=pre_v^post1, v_next^0'=v_next^post1, (v_next^0-v_next^post1 == 0 /\ pre_v^0-pre_v^post1 == 0 /\ v^0-v^post1 == 0), cost: 1 2: l2 -> l0 : v^0'=v^post2, pre_v^0'=pre_v^post2, v_next^0'=v_next^post2, (0 == 0 /\ -1-v^10+v^post2 == 0 /\ -v^0+pre_v^post2 == 0 /\ v^10-v_next^post2 == 0), cost: 1 3: l3 -> l2 : v^0'=v^post3, pre_v^0'=pre_v^post3, v_next^0'=v_next^post3, (-pre_v^post3+pre_v^0 == 0 /\ -v_next^post3+v_next^0 == 0 /\ -v^post3+v^0 == 0), cost: 1 4: l4 -> l3 : v^0'=v^post4, pre_v^0'=pre_v^post4, v_next^0'=v_next^post4, (-pre_v^post4+pre_v^0 == 0 /\ -v_next^post4+v_next^0 == 0 /\ -v^post4+v^0 == 0), cost: 1 Applied preprocessing Original rule: l0 -> l2 : v^0'=v^post1, pre_v^0'=pre_v^post1, v_next^0'=v_next^post1, (v_next^0-v_next^post1 == 0 /\ pre_v^0-pre_v^post1 == 0 /\ v^0-v^post1 == 0), cost: 1 New rule: l0 -> l2 : TRUE, cost: 1 Applied preprocessing Original rule: l2 -> l0 : v^0'=v^post2, pre_v^0'=pre_v^post2, v_next^0'=v_next^post2, (0 == 0 /\ -1-v^10+v^post2 == 0 /\ -v^0+pre_v^post2 == 0 /\ v^10-v_next^post2 == 0), cost: 1 New rule: l2 -> l0 : v^0'=1+v^10, pre_v^0'=v^0, v_next^0'=v^10, 0 == 0, cost: 1 Applied preprocessing Original rule: l3 -> l2 : v^0'=v^post3, pre_v^0'=pre_v^post3, v_next^0'=v_next^post3, (-pre_v^post3+pre_v^0 == 0 /\ -v_next^post3+v_next^0 == 0 /\ -v^post3+v^0 == 0), cost: 1 New rule: l3 -> l2 : TRUE, cost: 1 Applied preprocessing Original rule: l4 -> l3 : v^0'=v^post4, pre_v^0'=pre_v^post4, v_next^0'=v_next^post4, (-pre_v^post4+pre_v^0 == 0 /\ -v_next^post4+v_next^0 == 0 /\ -v^post4+v^0 == 0), cost: 1 New rule: l4 -> l3 : TRUE, cost: 1 Simplified rules Start location: l4 5: l0 -> l2 : TRUE, cost: 1 6: l2 -> l0 : v^0'=1+v^10, pre_v^0'=v^0, v_next^0'=v^10, 0 == 0, cost: 1 7: l3 -> l2 : TRUE, cost: 1 8: l4 -> l3 : TRUE, cost: 1 Eliminating location l3 by chaining: Applied chaining First rule: l4 -> l3 : TRUE, cost: 1 Second rule: l3 -> l2 : TRUE, cost: 1 New rule: l4 -> l2 : TRUE, cost: 2 Applied deletion Removed the following rules: 7 8 Eliminating location l0 by chaining: Applied chaining First rule: l2 -> l0 : v^0'=1+v^10, pre_v^0'=v^0, v_next^0'=v^10, 0 == 0, cost: 1 Second rule: l0 -> l2 : TRUE, cost: 1 New rule: l2 -> l2 : v^0'=1+v^10, pre_v^0'=v^0, v_next^0'=v^10, 0 == 0, cost: 2 Applied deletion Removed the following rules: 5 6 Eliminated locations on linear paths Start location: l4 10: l2 -> l2 : v^0'=1+v^10, pre_v^0'=v^0, v_next^0'=v^10, 0 == 0, cost: 2 9: l4 -> l2 : TRUE, cost: 2 Applied nonterm Original rule: l2 -> l2 : v^0'=1+v^10, pre_v^0'=v^0, v_next^0'=v^10, 0 == 0, cost: 2 New rule: l2 -> [5] : (0 >= 0 /\ -2+n >= 0), cost: NONTERM Sub-proof via acceration calculus written to file:///tmp/tmpnam_pokbLO.txt Applied simplification Original rule: l2 -> [5] : (0 >= 0 /\ -2+n >= 0), cost: NONTERM New rule: l2 -> [5] : -2+n >= 0, cost: NONTERM Accelerated simple loops Start location: l4 10: l2 -> l2 : v^0'=1+v^10, pre_v^0'=v^0, v_next^0'=v^10, 0 == 0, cost: 2 12: l2 -> [5] : -2+n >= 0, cost: NONTERM 9: l4 -> l2 : TRUE, cost: 2 Applied chaining First rule: l4 -> l2 : TRUE, cost: 2 Second rule: l2 -> l2 : v^0'=1+v^10, pre_v^0'=v^0, v_next^0'=v^10, 0 == 0, cost: 2 New rule: l4 -> l2 : v^0'=1+v^10, pre_v^0'=v^0, v_next^0'=v^10, 0 == 0, cost: 4 Applied chaining First rule: l4 -> l2 : TRUE, cost: 2 Second rule: l2 -> [5] : -2+n >= 0, cost: NONTERM New rule: l4 -> [5] : TRUE, cost: NONTERM Applied deletion Removed the following rules: 10 12 Chained accelerated rules with incoming rules Start location: l4 9: l4 -> l2 : TRUE, cost: 2 13: l4 -> l2 : v^0'=1+v^10, pre_v^0'=v^0, v_next^0'=v^10, 0 == 0, cost: 4 14: l4 -> [5] : TRUE, cost: NONTERM Removed unreachable locations and irrelevant leafs Start location: l4 14: l4 -> [5] : TRUE, cost: NONTERM Computing asymptotic complexity Proved nontermination of rule 14 via SMT. Proved the following lower bound Complexity: Nonterm Cpx degree: Nonterm Solved cost: NONTERM Rule cost: NONTERM Rule guard: TRUE