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Proof step 4 from proof refine-get (previous step)

prefixn(h, xs1 + ys) = prefixn(h, xs0), xs = xs0, # xs1 < h, # xs1 + # ys ≤ # xs0, ys = [] ∨ # ys = h ⊦ ⟪x := prefixn(h, xs)⟫ ⟨caterpillar_get#(h, xs1, ys; ; x0)⟩ (x = x0)

Heuristic symbolic execution applied rule assign right

And obtained the following new goals

Proof step 5:
prefixn(h, xs1 + ys) = prefixn(h, xs0), xs = xs0, # xs1 < h, # xs1 + # ys ≤ # xs0, ys = [] ∨ # ys = h ⊦ ⟨caterpillar_get#(h, xs1, ys; ; x0)⟩ (prefixn(h, xs) = x0)

Proof step 4 from proof refine-get (previous step)

Heuristic symbolic execution applied rule assign right

And obtained the following new goals

Rule argument

Additional information