MAYBE Initial complexity problem: 1: T: (Comp: ?, Cost: 1) f0(Ar_0) -> Com_1(f1(Fresh_1)) [ Fresh_1 >= 2 ] (Comp: ?, Cost: 1) f1(Ar_0) -> Com_1(f1(Fresh_0)) [ 1 >= Fresh_0 /\ Fresh_0 + 1 >= 0 /\ C >= 2 ] (Comp: 1, Cost: 0) koat_start(Ar_0) -> Com_1(f0(Ar_0)) [ 0 <= 0 ] start location: koat_start leaf cost: 0 Repeatedly propagating knowledge in problem 1 produces the following problem: 2: T: (Comp: 1, Cost: 1) f0(Ar_0) -> Com_1(f1(Fresh_1)) [ Fresh_1 >= 2 ] (Comp: ?, Cost: 1) f1(Ar_0) -> Com_1(f1(Fresh_0)) [ 1 >= Fresh_0 /\ Fresh_0 + 1 >= 0 /\ C >= 2 ] (Comp: 1, Cost: 0) koat_start(Ar_0) -> Com_1(f0(Ar_0)) [ 0 <= 0 ] start location: koat_start leaf cost: 0 Complexity upper bound ? Time: 0.408 sec (SMT: 0.386 sec)