Description
the question # 4.31
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Explanation & Answer
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4.31.a. Prove that having nonempty open sets that contain finitely many points is a
topological property.
Proof. Let 𝑋, 𝑌 be topological spaces and 𝑓: 𝑋 → 𝑌 be a homeomorphism. Let 𝑋 has the
property, we need to prove that 𝑌 has this property, too.
Ind...