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Proof step 13 from proof reach-n-next-legal (previous step)

r ∈ H, legal(H), reachable-n(H, n, r, r0) ⊦ r = null, ¬ (∃ r1. reachable-n(H, n, r, r1) ∧ reachable-1(H, r1, H[r0] .nxt)) ↔ H[r0] .nxt = null

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 12:
r ∈ H, legal(H), reachable-n(H, n, r, r0) ⊦ r = null, (∀ r1. ¬ reachable-n(H, n, r, r1) ∨ ¬ reachable-1(H, r1, H[r0] .nxt)) ↔ H[r0] .nxt = null

Rule argument

[emptyarg]

Additional information

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