NO Initial ITS Start location: l4 0: l0 -> l1 : x^0'=x^post0, 1-x^0+x^post0 == 0, cost: 1 2: l0 -> l2 : x^0'=x^post2, (1-x^0+x^post2 == 0 /\ 1-x^post2 <= 0), cost: 1 1: l1 -> l0 : x^0'=x^post1, x^0-x^post1 == 0, cost: 1 3: l2 -> l0 : x^0'=x^post3, x^0-x^post3 == 0, cost: 1 4: l3 -> l0 : x^0'=x^post4, x^0-x^post4 == 0, cost: 1 5: l4 -> l3 : x^0'=x^post5, x^0-x^post5 == 0, cost: 1 Applied preprocessing Original rule: l0 -> l1 : x^0'=x^post0, 1-x^0+x^post0 == 0, cost: 1 New rule: l0 -> l1 : x^0'=-1+x^0, TRUE, cost: 1 Applied preprocessing Original rule: l1 -> l0 : x^0'=x^post1, x^0-x^post1 == 0, cost: 1 New rule: l1 -> l0 : TRUE, cost: 1 Applied preprocessing Original rule: l0 -> l2 : x^0'=x^post2, (1-x^0+x^post2 == 0 /\ 1-x^post2 <= 0), cost: 1 New rule: l0 -> l2 : x^0'=-1+x^0, -2+x^0 >= 0, cost: 1 Applied preprocessing Original rule: l2 -> l0 : x^0'=x^post3, x^0-x^post3 == 0, cost: 1 New rule: l2 -> l0 : TRUE, cost: 1 Applied preprocessing Original rule: l3 -> l0 : x^0'=x^post4, x^0-x^post4 == 0, cost: 1 New rule: l3 -> l0 : TRUE, cost: 1 Applied preprocessing Original rule: l4 -> l3 : x^0'=x^post5, x^0-x^post5 == 0, cost: 1 New rule: l4 -> l3 : TRUE, cost: 1 Simplified rules Start location: l4 6: l0 -> l1 : x^0'=-1+x^0, TRUE, cost: 1 8: l0 -> l2 : x^0'=-1+x^0, -2+x^0 >= 0, cost: 1 7: l1 -> l0 : TRUE, cost: 1 9: l2 -> l0 : TRUE, cost: 1 10: l3 -> l0 : TRUE, cost: 1 11: l4 -> l3 : TRUE, cost: 1 Eliminating location l3 by chaining: Applied chaining First rule: l4 -> l3 : TRUE, cost: 1 Second rule: l3 -> l0 : TRUE, cost: 1 New rule: l4 -> l0 : TRUE, cost: 2 Applied deletion Removed the following rules: 10 11 Eliminating location l1 by chaining: Applied chaining First rule: l0 -> l1 : x^0'=-1+x^0, TRUE, cost: 1 Second rule: l1 -> l0 : TRUE, cost: 1 New rule: l0 -> l0 : x^0'=-1+x^0, TRUE, cost: 2 Applied deletion Removed the following rules: 6 7 Eliminating location l2 by chaining: Applied chaining First rule: l0 -> l2 : x^0'=-1+x^0, -2+x^0 >= 0, cost: 1 Second rule: l2 -> l0 : TRUE, cost: 1 New rule: l0 -> l0 : x^0'=-1+x^0, -2+x^0 >= 0, cost: 2 Applied deletion Removed the following rules: 8 9 Eliminated locations on linear paths Start location: l4 13: l0 -> l0 : x^0'=-1+x^0, TRUE, cost: 2 14: l0 -> l0 : x^0'=-1+x^0, -2+x^0 >= 0, cost: 2 12: l4 -> l0 : TRUE, cost: 2 Applied nonterm Original rule: l0 -> l0 : x^0'=-1+x^0, TRUE, cost: 2 New rule: l0 -> [5] : TRUE, cost: NONTERM Applied acceleration Original rule: l0 -> l0 : x^0'=-1+x^0, TRUE, cost: 2 New rule: l0 -> l0 : x^0'=x^0-n1, TRUE, cost: 2*n1 Applied acceleration Original rule: l0 -> l0 : x^0'=-1+x^0, -2+x^0 >= 0, cost: 2 New rule: l0 -> l0 : x^0'=x^0-n3, (n3 >= 0 /\ -1+x^0-n3 >= 0), cost: 2*n3 Applied instantiation Original rule: l0 -> l0 : x^0'=x^0-n3, (n3 >= 0 /\ -1+x^0-n3 >= 0), cost: 2*n3 New rule: l0 -> l0 : x^0'=1, (0 >= 0 /\ -1+x^0 >= 0), cost: -2+2*x^0 Applied simplification Original rule: l0 -> l0 : x^0'=1, (0 >= 0 /\ -1+x^0 >= 0), cost: -2+2*x^0 New rule: l0 -> l0 : x^0'=1, -1+x^0 >= 0, cost: -2+2*x^0 Applied deletion Removed the following rules: 13 14 Accelerated simple loops Start location: l4 15: l0 -> [5] : TRUE, cost: NONTERM 16: l0 -> l0 : x^0'=x^0-n1, TRUE, cost: 2*n1 18: l0 -> l0 : x^0'=1, -1+x^0 >= 0, cost: -2+2*x^0 12: l4 -> l0 : TRUE, cost: 2 Applied chaining First rule: l4 -> l0 : TRUE, cost: 2 Second rule: l0 -> [5] : TRUE, cost: NONTERM New rule: l4 -> [5] : TRUE, cost: NONTERM Applied chaining First rule: l4 -> l0 : TRUE, cost: 2 Second rule: l0 -> l0 : x^0'=x^0-n1, TRUE, cost: 2*n1 New rule: l4 -> l0 : x^0'=x^0-n1, TRUE, cost: 2+2*n1 Applied chaining First rule: l4 -> l0 : TRUE, cost: 2 Second rule: l0 -> l0 : x^0'=1, -1+x^0 >= 0, cost: -2+2*x^0 New rule: l4 -> l0 : x^0'=1, -1+x^0 >= 0, cost: 2*x^0 Applied deletion Removed the following rules: 15 16 18 Chained accelerated rules with incoming rules Start location: l4 12: l4 -> l0 : TRUE, cost: 2 19: l4 -> [5] : TRUE, cost: NONTERM 20: l4 -> l0 : x^0'=x^0-n1, TRUE, cost: 2+2*n1 21: l4 -> l0 : x^0'=1, -1+x^0 >= 0, cost: 2*x^0 Removed unreachable locations and irrelevant leafs Start location: l4 19: l4 -> [5] : TRUE, cost: NONTERM Computing asymptotic complexity Proved nontermination of rule 19 via SMT. Proved the following lower bound Complexity: Nonterm Cpx degree: Nonterm Solved cost: NONTERM Rule cost: NONTERM Rule guard: TRUE