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Proof step 1 from proof reachable-modbehind (conclusion)

⊦ reachable(r, r0, H) ∧ reachable(r0, r1, H) ∧ ¬ reachable(r1, r0, H) → (¬ reachable(r, r0, H[r1, ce]) ↔ false)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
reachable(r, r0, H), reachable(r0, r1, H), r0 ∈ H, r1 ∈ H ⊦ reachable(r1, r0, H), reachable(r, r0, H[r1, ce])

Rule argument

Additional information

Used simplifier rules: reach-alloc: ⊦ reachable(r, r1, H) → r1 ∈ H;