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Proof step 6 from proof refine-get (previous step)

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

Heuristic unfold applied rule call right

And obtained the following new goals

Proof step 7:
prefixn(h, xs1 + ys) = prefixn(h, xs0), xs = xs1, # xs1 < h, # xs1 + # ys ≤ # xs0, ys = [] ∨ # ys = h ⊦ ⟨x := prefixn(h, xs + ys)⟩ (prefixn(h, xs0) = x)

Rule argument

pos: right 1

Additional information

Used simplifier rules: caterpillar_get#(h, xs, ys; ; x){x := prefixn(h, xs + ys)};