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Proof step 6 from proof reach-n-next-legal (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
r ∈ H, legal(H), reachable-n(H, m + 1, r, r0) ⊦ H[r0] .nxt = null, r = null, r0 ≠ null ∧ r0 ∈ H

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ m +1 = m + 1])]]