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Proof step 15 from proof reach-n-next-legal (conclusion)

⊦ reachable-n(H, n, r, r0) ∧ legal(H) ∧ r ≠ null ∧ r ∈ H → (¬ reachable-n(H, n + 1, r, H[r0] .nxt) ↔ H[r0] .nxt = null)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 14:
r ∈ H, legal(H), reachable-n(H, n, r, r0) ⊦ r = null, ¬ reachable-n(H, n + 1, r, H[r0] .nxt) ↔ H[r0] .nxt = null

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]