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Proof step 25 from proof refine-add (previous step)

# ys = h0, # ys = # xs + 1, h = # xs + 1, xs_len = # xs, ((ls(rxs, xs) * ls(rys, ys) * del-list(to_delete, n)))(H), ((del-list(to_delete, n) * ls(rys, ys) * ls(rxs, xs)))(H), ((ls(rys, ys) * ls(rxs, xs)))(H1), n < 2, n ≤ 1, n ≤ # xs + # ys ⊦ ⟨if xs_len + 1 = h then {ys := a + xs; xs_len := 0; xs := []} else {xs := a + xs; xs_len := 1 + xs_len}⟩ (xs = [] ∧ (∃ n0. (∃ x. n0 = # x ∧ ((ls(rys, x) * ls(r, ys)))((H1 ++ r)[r, a × rxs])) ∧ n0 ≤ # ys ∧ n0 ≤ h0 ∧ 0 = xs_len)), r = null, rys = null, ys = [], r ∈ H1

Heuristic symbolic execution applied rule if positive right

And obtained the following new goals

Proof step 26:
# ys = # xs + 1, # ys = h0, h = # xs + 1, xs_len = # xs, ((ls(rys, ys) * ls(rxs, xs)))(H1), ((del-list(to_delete, n) * ls(rys, ys) * ls(rxs, xs)))(H), ((ls(rxs, xs) * ls(rys, ys) * del-list(to_delete, n)))(H), n < 2, n ≤ # xs + # ys, n ≤ 1 ⊦ ⟨ys := a + xs; xs_len := 0; xs := []⟩ (xs = [] ∧ (∃ n0. (∃ x. n0 = # x ∧ ((ls(rys, x) * ls(r, ys)))((H1 ++ r)[r, a × rxs])) ∧ n0 ≤ # ys ∧ n0 ≤ h0 ∧ 0 = xs_len)), r = null, rys = null, ys = [], r ∈ H1

Rule argument

pos: right 1

Proof step 25 from proof refine-add (previous step)

Heuristic symbolic execution applied rule if positive right

And obtained the following new goals

Rule argument

Additional information