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Proof step 11 from proof reach-n-next-legal (previous step)

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

User applied rule all left

And obtained the following new goals

Proof step 10:
¬ reachable-n(H, n, r, r0) ∨ ¬ reachable-1(H, r0, H[r0] .nxt), r ∈ H, legal(H), reachable-n(H, n, r, r0) ⊦ H[r0] .nxt = null, r = null

Rule argument

[EXRARG : pos: left 1, [extquanttermlist: (r0)abort:F, discard:T, computed:T]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (r0)]]