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Proof step 8 from proof initialization (previous step)

n0 = n ⊦ ⟪to_delete := []; xs_len := 0; H := ∅⟫ ⟨caterpillar_init#(n; ; h0, xs, xs_len0, ys)⟩ ∃ n. ((ls(null, xs) * ls(null, ys) * del-list(to_delete, n)))(H) ∧ n ≤ # xs + # ys ∧ n + # xs ≤ h0 ∧ n0 = h0 ∧ xs_len = xs_len0, n = 0

Heuristic symbolic execution applied rule assign right

And obtained the following new goals

Proof step 9:
n0 = n ⊦ ⟪xs_len := 0; H := ∅⟫ ⟨caterpillar_init#(n; ; h0, xs, xs_len0, ys)⟩ ∃ n. ((ls(null, xs) * ls(null, ys) * del-list([], n)))(H) ∧ n ≤ # xs + # ys ∧ n + # xs ≤ h0 ∧ n0 = h0 ∧ xs_len = xs_len0, n = 0

Proof step 8 from proof initialization (previous step)

Heuristic symbolic execution applied rule assign right

And obtained the following new goals

Rule argument

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