NO Initial ITS Start location: l4 0: l0 -> l1 : x_5^0'=x_5^post0, x_5^0-x_5^post0 == 0, cost: 1 1: l1 -> l2 : x_5^0'=x_5^post1, (-x_5^post1 <= 0 /\ 1-x_5^0+x_5^post1 == 0), cost: 1 3: l1 -> l3 : x_5^0'=x_5^post3, (1+x_5^post3 <= 0 /\ 1-x_5^0+x_5^post3 == 0), cost: 1 2: l2 -> l1 : x_5^0'=x_5^post2, x_5^0-x_5^post2 == 0, cost: 1 4: l3 -> l1 : x_5^0'=x_5^post4, x_5^0-x_5^post4 == 0, cost: 1 5: l4 -> l0 : x_5^0'=x_5^post5, x_5^0-x_5^post5 == 0, cost: 1 Applied preprocessing Original rule: l0 -> l1 : x_5^0'=x_5^post0, x_5^0-x_5^post0 == 0, cost: 1 New rule: l0 -> l1 : TRUE, cost: 1 Applied preprocessing Original rule: l1 -> l2 : x_5^0'=x_5^post1, (-x_5^post1 <= 0 /\ 1-x_5^0+x_5^post1 == 0), cost: 1 New rule: l1 -> l2 : x_5^0'=-1+x_5^0, -1+x_5^0 >= 0, cost: 1 Applied preprocessing Original rule: l2 -> l1 : x_5^0'=x_5^post2, x_5^0-x_5^post2 == 0, cost: 1 New rule: l2 -> l1 : TRUE, cost: 1 Applied preprocessing Original rule: l1 -> l3 : x_5^0'=x_5^post3, (1+x_5^post3 <= 0 /\ 1-x_5^0+x_5^post3 == 0), cost: 1 New rule: l1 -> l3 : x_5^0'=-1+x_5^0, x_5^0 <= 0, cost: 1 Applied preprocessing Original rule: l3 -> l1 : x_5^0'=x_5^post4, x_5^0-x_5^post4 == 0, cost: 1 New rule: l3 -> l1 : TRUE, cost: 1 Applied preprocessing Original rule: l4 -> l0 : x_5^0'=x_5^post5, x_5^0-x_5^post5 == 0, cost: 1 New rule: l4 -> l0 : TRUE, cost: 1 Simplified rules Start location: l4 6: l0 -> l1 : TRUE, cost: 1 7: l1 -> l2 : x_5^0'=-1+x_5^0, -1+x_5^0 >= 0, cost: 1 9: l1 -> l3 : x_5^0'=-1+x_5^0, x_5^0 <= 0, cost: 1 8: l2 -> l1 : TRUE, cost: 1 10: l3 -> l1 : TRUE, cost: 1 11: l4 -> l0 : TRUE, cost: 1 Eliminating location l0 by chaining: Applied chaining First rule: l4 -> l0 : TRUE, cost: 1 Second rule: l0 -> l1 : TRUE, cost: 1 New rule: l4 -> l1 : TRUE, cost: 2 Applied deletion Removed the following rules: 6 11 Eliminating location l2 by chaining: Applied chaining First rule: l1 -> l2 : x_5^0'=-1+x_5^0, -1+x_5^0 >= 0, cost: 1 Second rule: l2 -> l1 : TRUE, cost: 1 New rule: l1 -> l1 : x_5^0'=-1+x_5^0, -1+x_5^0 >= 0, cost: 2 Applied deletion Removed the following rules: 7 8 Eliminating location l3 by chaining: Applied chaining First rule: l1 -> l3 : x_5^0'=-1+x_5^0, x_5^0 <= 0, cost: 1 Second rule: l3 -> l1 : TRUE, cost: 1 New rule: l1 -> l1 : x_5^0'=-1+x_5^0, x_5^0 <= 0, cost: 2 Applied deletion Removed the following rules: 9 10 Eliminated locations on linear paths Start location: l4 13: l1 -> l1 : x_5^0'=-1+x_5^0, -1+x_5^0 >= 0, cost: 2 14: l1 -> l1 : x_5^0'=-1+x_5^0, x_5^0 <= 0, cost: 2 12: l4 -> l1 : TRUE, cost: 2 Applied acceleration Original rule: l1 -> l1 : x_5^0'=-1+x_5^0, -1+x_5^0 >= 0, cost: 2 New rule: l1 -> l1 : x_5^0'=x_5^0-n1, (x_5^0-n1 >= 0 /\ n1 >= 0), cost: 2*n1 Applied instantiation Original rule: l1 -> l1 : x_5^0'=x_5^0-n1, (x_5^0-n1 >= 0 /\ n1 >= 0), cost: 2*n1 New rule: l1 -> l1 : x_5^0'=0, (0 >= 0 /\ x_5^0 >= 0), cost: 2*x_5^0 Applied nonterm Original rule: l1 -> l1 : x_5^0'=-1+x_5^0, x_5^0 <= 0, cost: 2 New rule: l1 -> [5] : -x_5^0 >= 0, cost: NONTERM Applied acceleration Original rule: l1 -> l1 : x_5^0'=-1+x_5^0, x_5^0 <= 0, cost: 2 New rule: l1 -> l1 : x_5^0'=x_5^0-n3, -x_5^0 >= 0, cost: 2*n3 Applied simplification Original rule: l1 -> l1 : x_5^0'=0, (0 >= 0 /\ x_5^0 >= 0), cost: 2*x_5^0 New rule: l1 -> l1 : x_5^0'=0, x_5^0 >= 0, cost: 2*x_5^0 Applied simplification Original rule: l1 -> [5] : -x_5^0 >= 0, cost: NONTERM New rule: l1 -> [5] : x_5^0 <= 0, cost: NONTERM Applied simplification Original rule: l1 -> l1 : x_5^0'=x_5^0-n3, -x_5^0 >= 0, cost: 2*n3 New rule: l1 -> l1 : x_5^0'=x_5^0-n3, x_5^0 <= 0, cost: 2*n3 Applied deletion Removed the following rules: 13 14 Accelerated simple loops Start location: l4 18: l1 -> l1 : x_5^0'=0, x_5^0 >= 0, cost: 2*x_5^0 19: l1 -> [5] : x_5^0 <= 0, cost: NONTERM 20: l1 -> l1 : x_5^0'=x_5^0-n3, x_5^0 <= 0, cost: 2*n3 12: l4 -> l1 : TRUE, cost: 2 Applied chaining First rule: l4 -> l1 : TRUE, cost: 2 Second rule: l1 -> l1 : x_5^0'=0, x_5^0 >= 0, cost: 2*x_5^0 New rule: l4 -> l1 : x_5^0'=0, x_5^0 >= 0, cost: 2+2*x_5^0 Applied chaining First rule: l4 -> l1 : TRUE, cost: 2 Second rule: l1 -> [5] : x_5^0 <= 0, cost: NONTERM New rule: l4 -> [5] : x_5^0 <= 0, cost: NONTERM Applied chaining First rule: l4 -> l1 : TRUE, cost: 2 Second rule: l1 -> l1 : x_5^0'=x_5^0-n3, x_5^0 <= 0, cost: 2*n3 New rule: l4 -> l1 : x_5^0'=x_5^0-n3, x_5^0 <= 0, cost: 2+2*n3 Applied deletion Removed the following rules: 18 19 20 Chained accelerated rules with incoming rules Start location: l4 12: l4 -> l1 : TRUE, cost: 2 21: l4 -> l1 : x_5^0'=0, x_5^0 >= 0, cost: 2+2*x_5^0 22: l4 -> [5] : x_5^0 <= 0, cost: NONTERM 23: l4 -> l1 : x_5^0'=x_5^0-n3, x_5^0 <= 0, cost: 2+2*n3 Removed unreachable locations and irrelevant leafs Start location: l4 22: l4 -> [5] : x_5^0 <= 0, cost: NONTERM Computing asymptotic complexity Proved nontermination of rule 22 via SMT. Proved the following lower bound Complexity: Nonterm Cpx degree: Nonterm Solved cost: NONTERM Rule cost: NONTERM Rule guard: x_5^0 <= 0