◀ ▲ ▶Branches / Topology / Definition: Regular Open, Regular Closed
Definition: Regular Open, Regular Closed
A set $B$ that equals its interior of its closure $B=B^{\circ}$ is called regular open.
A set $B$ that equals its closure of its interior $B=B^{\circ}$ is called regular closed.
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References
Bibliography
 Forster Otto: "Analysis 2, Differentialrechnung im \(\mathbb R^n\), Gewöhnliche Differentialgleichungen", Vieweg Studium, 1984
 Steen, L.A.;Seebach J.A.Jr.: "Counterexamples in Topology", Dover Publications, Inc, 1970
 Jänich, Klaus: "Topologie", Springer, 2001, 7th Edition