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Proof step 19 from proof is-encoded-rec-unique (previous step)

vtbl ≠ ∅ ⊦ is-encoded-rec(vtbl, buf) ↔ (∃ v, buf0, buf1, buf2. v ∈ vtbl ∧ buf = buf0 + buf1 + buf2 ∧ is-encoded(v, buf0) ∧ is-encoded(vtbl[v], buf1) ∧ is-encoded-rec(vtbl -- v, buf2))

Lemma is-encoded-rec