Minimal-envelope extension (E): a hole $B$ with $|B|\le k$ extends to a hole of size $\min(k,\,r+|B|-\rho(B))$ (Erdős 624)

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Minimal-envelope extension (E): a hole $B$ with $|B|\le k$ extends to a hole of size $\min(k,\,r+|B|-\rho(B))$ (Erdős 624) · Prove2Me