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Proof step 81 from proof refine-add (previous step)

((ls(rxs, xs) * ls(rys, ys) * del-list(to_delete, n)))(H), ((del-list(to_delete, n) * ls(rys, ys) * ls(rxs, xs)))(H), # xs < h0, n ≤ # xs + # ys, n + # xs ≤ h0, n < 2 → to_delete0 = [] ∧ ((ls(rys, ys) * ls(rxs, xs)))(H0), 2 ≤ n → ((del-list(to_delete0, n - 2) * ls(rys, ys) * ls(rxs, xs)))(H0), ∃ r. r ≠ null ∧ ¬ r ∈ H0, ys = [] ∨ # ys = h0 ⊦ ∃ r. ¬ r ∈ H0 ∧ r ≠ null

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 82:
((del-list(to_delete, n) * ls(rys, ys) * ls(rxs, xs)))(H), ((ls(rxs, xs) * ls(rys, ys) * del-list(to_delete, n)))(H), # xs < h0, n + # xs ≤ h0, n ≤ # xs + # ys, 2 ≤ n → ((del-list(to_delete0, n - 2) * ls(rys, ys) * ls(rxs, xs)))(H0), n < 2 → to_delete0 = [] ∧ ((ls(rys, ys) * ls(rxs, xs)))(H0), ys = [] ∨ # ys = h0 ⊦ r = null, r ∈ H0, ∃ r. ¬ r ∈ H0 ∧ r ≠ null

Proof step 81 from proof refine-add (previous step)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

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