LTS Termination Proof

by T2Cert

Input

Integer Transition System

Proof

1 Switch to Cooperation Termination Proof

We consider the following cutpoint-transitions:
1 22 1: − x2_post + x2_post ≤ 0 ∧ x2_post − x2_post ≤ 0 ∧ − x2_0 + x2_0 ≤ 0 ∧ x2_0 − x2_0 ≤ 0 ∧ − x1_post + x1_post ≤ 0 ∧ x1_post − x1_post ≤ 0 ∧ − x1_0 + x1_0 ≤ 0 ∧ x1_0 − x1_0 ≤ 0 ∧ − x0_post + x0_post ≤ 0 ∧ x0_post − x0_post ≤ 0 ∧ − x0_0 + x0_0 ≤ 0 ∧ x0_0 − x0_0 ≤ 0 ∧ − oldX5_post + oldX5_post ≤ 0 ∧ oldX5_post − oldX5_post ≤ 0 ∧ − oldX5_0 + oldX5_0 ≤ 0 ∧ oldX5_0 − oldX5_0 ≤ 0 ∧ − oldX4_post + oldX4_post ≤ 0 ∧ oldX4_post − oldX4_post ≤ 0 ∧ − oldX4_0 + oldX4_0 ≤ 0 ∧ oldX4_0 − oldX4_0 ≤ 0 ∧ − oldX3_post + oldX3_post ≤ 0 ∧ oldX3_post − oldX3_post ≤ 0 ∧ − oldX3_0 + oldX3_0 ≤ 0 ∧ oldX3_0 − oldX3_0 ≤ 0 ∧ − oldX2_post + oldX2_post ≤ 0 ∧ oldX2_post − oldX2_post ≤ 0 ∧ − oldX2_0 + oldX2_0 ≤ 0 ∧ oldX2_0 − oldX2_0 ≤ 0 ∧ − oldX1_post + oldX1_post ≤ 0 ∧ oldX1_post − oldX1_post ≤ 0 ∧ − oldX1_0 + oldX1_0 ≤ 0 ∧ oldX1_0 − oldX1_0 ≤ 0 ∧ − oldX0_post + oldX0_post ≤ 0 ∧ oldX0_post − oldX0_post ≤ 0 ∧ − oldX0_0 + oldX0_0 ≤ 0 ∧ oldX0_0 − oldX0_0 ≤ 0
4 29 4: − x2_post + x2_post ≤ 0 ∧ x2_post − x2_post ≤ 0 ∧ − x2_0 + x2_0 ≤ 0 ∧ x2_0 − x2_0 ≤ 0 ∧ − x1_post + x1_post ≤ 0 ∧ x1_post − x1_post ≤ 0 ∧ − x1_0 + x1_0 ≤ 0 ∧ x1_0 − x1_0 ≤ 0 ∧ − x0_post + x0_post ≤ 0 ∧ x0_post − x0_post ≤ 0 ∧ − x0_0 + x0_0 ≤ 0 ∧ x0_0 − x0_0 ≤ 0 ∧ − oldX5_post + oldX5_post ≤ 0 ∧ oldX5_post − oldX5_post ≤ 0 ∧ − oldX5_0 + oldX5_0 ≤ 0 ∧ oldX5_0 − oldX5_0 ≤ 0 ∧ − oldX4_post + oldX4_post ≤ 0 ∧ oldX4_post − oldX4_post ≤ 0 ∧ − oldX4_0 + oldX4_0 ≤ 0 ∧ oldX4_0 − oldX4_0 ≤ 0 ∧ − oldX3_post + oldX3_post ≤ 0 ∧ oldX3_post − oldX3_post ≤ 0 ∧ − oldX3_0 + oldX3_0 ≤ 0 ∧ oldX3_0 − oldX3_0 ≤ 0 ∧ − oldX2_post + oldX2_post ≤ 0 ∧ oldX2_post − oldX2_post ≤ 0 ∧ − oldX2_0 + oldX2_0 ≤ 0 ∧ oldX2_0 − oldX2_0 ≤ 0 ∧ − oldX1_post + oldX1_post ≤ 0 ∧ oldX1_post − oldX1_post ≤ 0 ∧ − oldX1_0 + oldX1_0 ≤ 0 ∧ oldX1_0 − oldX1_0 ≤ 0 ∧ − oldX0_post + oldX0_post ≤ 0 ∧ oldX0_post − oldX0_post ≤ 0 ∧ − oldX0_0 + oldX0_0 ≤ 0 ∧ oldX0_0 − oldX0_0 ≤ 0
and for every transition t, a duplicate t is considered.

2 Transition Removal

We remove transitions 5, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21 using the following ranking functions, which are bounded by −19.

10: 0
9: 0
8: 0
0: 0
1: 0
2: 0
3: 0
4: 0
5: 0
6: 0
7: 0
10: −7
9: −8
8: −9
0: −10
1: −10
2: −10
3: −10
4: −10
5: −10
1_var_snapshot: −10
1*: −10
4_var_snapshot: −10
4*: −10
6: −16
7: −17

3 Location Addition

The following skip-transition is inserted and corresponding redirections w.r.t. the old location are performed.

1* 25 1: − x2_post + x2_post ≤ 0 ∧ x2_post − x2_post ≤ 0 ∧ − x2_0 + x2_0 ≤ 0 ∧ x2_0 − x2_0 ≤ 0 ∧ − x1_post + x1_post ≤ 0 ∧ x1_post − x1_post ≤ 0 ∧ − x1_0 + x1_0 ≤ 0 ∧ x1_0 − x1_0 ≤ 0 ∧ − x0_post + x0_post ≤ 0 ∧ x0_post − x0_post ≤ 0 ∧ − x0_0 + x0_0 ≤ 0 ∧ x0_0 − x0_0 ≤ 0 ∧ − oldX5_post + oldX5_post ≤ 0 ∧ oldX5_post − oldX5_post ≤ 0 ∧ − oldX5_0 + oldX5_0 ≤ 0 ∧ oldX5_0 − oldX5_0 ≤ 0 ∧ − oldX4_post + oldX4_post ≤ 0 ∧ oldX4_post − oldX4_post ≤ 0 ∧ − oldX4_0 + oldX4_0 ≤ 0 ∧ oldX4_0 − oldX4_0 ≤ 0 ∧ − oldX3_post + oldX3_post ≤ 0 ∧ oldX3_post − oldX3_post ≤ 0 ∧ − oldX3_0 + oldX3_0 ≤ 0 ∧ oldX3_0 − oldX3_0 ≤ 0 ∧ − oldX2_post + oldX2_post ≤ 0 ∧ oldX2_post − oldX2_post ≤ 0 ∧ − oldX2_0 + oldX2_0 ≤ 0 ∧ oldX2_0 − oldX2_0 ≤ 0 ∧ − oldX1_post + oldX1_post ≤ 0 ∧ oldX1_post − oldX1_post ≤ 0 ∧ − oldX1_0 + oldX1_0 ≤ 0 ∧ oldX1_0 − oldX1_0 ≤ 0 ∧ − oldX0_post + oldX0_post ≤ 0 ∧ oldX0_post − oldX0_post ≤ 0 ∧ − oldX0_0 + oldX0_0 ≤ 0 ∧ oldX0_0 − oldX0_0 ≤ 0

4 Location Addition

The following skip-transition is inserted and corresponding redirections w.r.t. the old location are performed.

1 23 1_var_snapshot: − x2_post + x2_post ≤ 0 ∧ x2_post − x2_post ≤ 0 ∧ − x2_0 + x2_0 ≤ 0 ∧ x2_0 − x2_0 ≤ 0 ∧ − x1_post + x1_post ≤ 0 ∧ x1_post − x1_post ≤ 0 ∧ − x1_0 + x1_0 ≤ 0 ∧ x1_0 − x1_0 ≤ 0 ∧ − x0_post + x0_post ≤ 0 ∧ x0_post − x0_post ≤ 0 ∧ − x0_0 + x0_0 ≤ 0 ∧ x0_0 − x0_0 ≤ 0 ∧ − oldX5_post + oldX5_post ≤ 0 ∧ oldX5_post − oldX5_post ≤ 0 ∧ − oldX5_0 + oldX5_0 ≤ 0 ∧ oldX5_0 − oldX5_0 ≤ 0 ∧ − oldX4_post + oldX4_post ≤ 0 ∧ oldX4_post − oldX4_post ≤ 0 ∧ − oldX4_0 + oldX4_0 ≤ 0 ∧ oldX4_0 − oldX4_0 ≤ 0 ∧ − oldX3_post + oldX3_post ≤ 0 ∧ oldX3_post − oldX3_post ≤ 0 ∧ − oldX3_0 + oldX3_0 ≤ 0 ∧ oldX3_0 − oldX3_0 ≤ 0 ∧ − oldX2_post + oldX2_post ≤ 0 ∧ oldX2_post − oldX2_post ≤ 0 ∧ − oldX2_0 + oldX2_0 ≤ 0 ∧ oldX2_0 − oldX2_0 ≤ 0 ∧ − oldX1_post + oldX1_post ≤ 0 ∧ oldX1_post − oldX1_post ≤ 0 ∧ − oldX1_0 + oldX1_0 ≤ 0 ∧ oldX1_0 − oldX1_0 ≤ 0 ∧ − oldX0_post + oldX0_post ≤ 0 ∧ oldX0_post − oldX0_post ≤ 0 ∧ − oldX0_0 + oldX0_0 ≤ 0 ∧ oldX0_0 − oldX0_0 ≤ 0

5 Location Addition

The following skip-transition is inserted and corresponding redirections w.r.t. the old location are performed.

4* 32 4: − x2_post + x2_post ≤ 0 ∧ x2_post − x2_post ≤ 0 ∧ − x2_0 + x2_0 ≤ 0 ∧ x2_0 − x2_0 ≤ 0 ∧ − x1_post + x1_post ≤ 0 ∧ x1_post − x1_post ≤ 0 ∧ − x1_0 + x1_0 ≤ 0 ∧ x1_0 − x1_0 ≤ 0 ∧ − x0_post + x0_post ≤ 0 ∧ x0_post − x0_post ≤ 0 ∧ − x0_0 + x0_0 ≤ 0 ∧ x0_0 − x0_0 ≤ 0 ∧ − oldX5_post + oldX5_post ≤ 0 ∧ oldX5_post − oldX5_post ≤ 0 ∧ − oldX5_0 + oldX5_0 ≤ 0 ∧ oldX5_0 − oldX5_0 ≤ 0 ∧ − oldX4_post + oldX4_post ≤ 0 ∧ oldX4_post − oldX4_post ≤ 0 ∧ − oldX4_0 + oldX4_0 ≤ 0 ∧ oldX4_0 − oldX4_0 ≤ 0 ∧ − oldX3_post + oldX3_post ≤ 0 ∧ oldX3_post − oldX3_post ≤ 0 ∧ − oldX3_0 + oldX3_0 ≤ 0 ∧ oldX3_0 − oldX3_0 ≤ 0 ∧ − oldX2_post + oldX2_post ≤ 0 ∧ oldX2_post − oldX2_post ≤ 0 ∧ − oldX2_0 + oldX2_0 ≤ 0 ∧ oldX2_0 − oldX2_0 ≤ 0 ∧ − oldX1_post + oldX1_post ≤ 0 ∧ oldX1_post − oldX1_post ≤ 0 ∧ − oldX1_0 + oldX1_0 ≤ 0 ∧ oldX1_0 − oldX1_0 ≤ 0 ∧ − oldX0_post + oldX0_post ≤ 0 ∧ oldX0_post − oldX0_post ≤ 0 ∧ − oldX0_0 + oldX0_0 ≤ 0 ∧ oldX0_0 − oldX0_0 ≤ 0

6 Location Addition

The following skip-transition is inserted and corresponding redirections w.r.t. the old location are performed.

4 30 4_var_snapshot: − x2_post + x2_post ≤ 0 ∧ x2_post − x2_post ≤ 0 ∧ − x2_0 + x2_0 ≤ 0 ∧ x2_0 − x2_0 ≤ 0 ∧ − x1_post + x1_post ≤ 0 ∧ x1_post − x1_post ≤ 0 ∧ − x1_0 + x1_0 ≤ 0 ∧ x1_0 − x1_0 ≤ 0 ∧ − x0_post + x0_post ≤ 0 ∧ x0_post − x0_post ≤ 0 ∧ − x0_0 + x0_0 ≤ 0 ∧ x0_0 − x0_0 ≤ 0 ∧ − oldX5_post + oldX5_post ≤ 0 ∧ oldX5_post − oldX5_post ≤ 0 ∧ − oldX5_0 + oldX5_0 ≤ 0 ∧ oldX5_0 − oldX5_0 ≤ 0 ∧ − oldX4_post + oldX4_post ≤ 0 ∧ oldX4_post − oldX4_post ≤ 0 ∧ − oldX4_0 + oldX4_0 ≤ 0 ∧ oldX4_0 − oldX4_0 ≤ 0 ∧ − oldX3_post + oldX3_post ≤ 0 ∧ oldX3_post − oldX3_post ≤ 0 ∧ − oldX3_0 + oldX3_0 ≤ 0 ∧ oldX3_0 − oldX3_0 ≤ 0 ∧ − oldX2_post + oldX2_post ≤ 0 ∧ oldX2_post − oldX2_post ≤ 0 ∧ − oldX2_0 + oldX2_0 ≤ 0 ∧ oldX2_0 − oldX2_0 ≤ 0 ∧ − oldX1_post + oldX1_post ≤ 0 ∧ oldX1_post − oldX1_post ≤ 0 ∧ − oldX1_0 + oldX1_0 ≤ 0 ∧ oldX1_0 − oldX1_0 ≤ 0 ∧ − oldX0_post + oldX0_post ≤ 0 ∧ oldX0_post − oldX0_post ≤ 0 ∧ − oldX0_0 + oldX0_0 ≤ 0 ∧ oldX0_0 − oldX0_0 ≤ 0

7 SCC Decomposition

We consider subproblems for each of the 1 SCC(s) of the program graph.

7.1 SCC Subproblem 1/1

Here we consider the SCC { 0, 1, 2, 3, 4, 5, 1_var_snapshot, 1*, 4_var_snapshot, 4* }.

7.1.1 Transition Removal

We remove transition 9 using the following ranking functions, which are bounded by 8.

0: −7 + 9⋅x0_0 − 9⋅x1_0
1: −7 + 9⋅x0_0 − 9⋅x1_0
2: −7 + 9⋅x0_0 − 9⋅x1_0
3: −8 + 9⋅x0_0 − 9⋅x1_0
4: 1 + 9⋅x0_0 − 9⋅x1_0
5: −7 + 9⋅x0_0 − 9⋅x1_0
1_var_snapshot: −7 + 9⋅x0_0 − 9⋅x1_0
1*: −7 + 9⋅x0_0 − 9⋅x1_0
4_var_snapshot: 9⋅x0_0 − 9⋅x1_0
4*: 1 + 9⋅x0_0 − 9⋅x1_0

7.1.2 Transition Removal

We remove transition 7 using the following ranking functions, which are bounded by 8.

0: −6 + 9⋅x0_0 − 9⋅x1_0 − 9⋅x2_0
1: 1 + 9⋅x0_0 − 9⋅x1_0 − 9⋅x2_0
2: −5 + 9⋅x0_0 − 9⋅x1_0 − 9⋅x2_0
3: −1 + 9⋅x0_0 − 9⋅x1_0 − 9⋅x2_0
4: 6⋅oldX0_post − 6⋅oldX1_post − oldX2_0 − 8⋅oldX2_post + 3⋅x0_0 − 3⋅x1_0
5: −4 + 9⋅x0_0 − 9⋅x1_0 − 9⋅x2_0
1_var_snapshot: 9⋅x0_0 − 9⋅x1_0 − 9⋅x2_0
1*: 2 + 9⋅x0_0 − 9⋅x1_0 − 9⋅x2_0
4_var_snapshot: −1 + 6⋅oldX0_post − 6⋅oldX1_post − oldX2_0 − 8⋅oldX2_post + 3⋅x0_0 − 3⋅x1_0
4*: 1 + 6⋅oldX0_post − 6⋅oldX1_post − oldX2_0 − 8⋅oldX2_post + 3⋅x0_0 − 3⋅x1_0

7.1.3 Transition Removal

We remove transitions 23, 25, 30, 32, 0, 1, 2, 3, 4, 6 using the following ranking functions, which are bounded by −4.

0: 3
1: 1
2: 4
3: −1
4: −3
5: 5
1_var_snapshot: 0
1*: 2
4_var_snapshot: −4
4*: −2

7.1.4 Splitting Cut-Point Transitions

We consider 2 subproblems corresponding to sets of cut-point transitions as follows.

7.1.4.1 Cut-Point Subproblem 1/2

Here we consider cut-point transition 22.

7.1.4.1.1 Splitting Cut-Point Transitions

There remain no cut-point transition to consider. Hence the cooperation termination is trivial.

7.1.4.2 Cut-Point Subproblem 2/2

Here we consider cut-point transition 29.

7.1.4.2.1 Splitting Cut-Point Transitions

There remain no cut-point transition to consider. Hence the cooperation termination is trivial.

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