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Proof step 47 from proof refine-add (previous step)

h = # xs + 1, xs_len = # xs, ys = [], ((del-list(to_delete, n) * ls(rxs, xs)))(H), ((ls(rxs, xs) * del-list(to_delete, n)))(H), n < 2, ls(rxs, xs)(H1), n ≤ # xs, n ≤ 1 ⊦ ⟨xs_len := 0; xs0 := []⟩ (xs0 = [] ∧ ls(r, a + xs)((H1 ++ r)[r, a × rxs]) ∧ 0 = xs_len), r = null, r ∈ H1

Heuristic symbolic execution applied rule assign right

And obtained the following new goals

Proof step 48:
h = # xs + 1, xs_len = # xs, ys = [], ((ls(rxs, xs) * del-list(to_delete, n)))(H), ((del-list(to_delete, n) * ls(rxs, xs)))(H), n < 2, ls(rxs, xs)(H1), n ≤ 1, n ≤ # xs ⊦ ⟨xs0 := []⟩ (xs0 = [] ∧ ls(r, a + xs)((H1 ++ r)[r, a × rxs]) ∧ 0 = 0), r = null, r ∈ H1

Proof step 47 from proof refine-add (previous step)

Heuristic symbolic execution applied rule assign right

And obtained the following new goals

Rule argument

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