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Proof step 41 from proof legal-noncylic-equiv-reaches-null (previous step)

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

User applied rule all left

And obtained the following new goals

Proof step 40:
H[r0] .nxt = null, reachable-n(H, n, r, r0), legal(H), r ∈ H, r0 ∈ H, ∃ r0. reachable-n(H, n + 1, r, r0) ⊦ r = null

Rule argument

[EXRARG : pos: left 6, [extquanttermlist: (n + 1)abort:F, discard:T, computed:F]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (n + 1)]]