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Proof step 24 from proof legal-noncylic-equiv-reaches-null (previous step)

legal(H), r ∈ H, reachable-n(H, n0, r, r0) ⊦ r = null, ∃ r0. reachable(r, r0, H) ∧ H[r0] .nxt = null, reachable-n(H, n0, r, r0) ∧ reachable-1(H, r0, H[r0] .nxt)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 23:
legal(H), r ∈ H, reachable-n(H, n0, r, r0) ⊦ r = null, reachable-1(H, r0, H[r0] .nxt), ∃ r0. reachable(r, r0, H) ∧ H[r0] .nxt = null

Rule argument

[emptyarg]

Additional information

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