Closure and interior in finite topological spaces
H.-H. Herda, R. C. Metzler (1966)
Colloquium Mathematicae
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H.-H. Herda, R. C. Metzler (1966)
Colloquium Mathematicae
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Rose, David A. (1991)
International Journal of Mathematics and Mathematical Sciences
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Edward Kocela (1973)
Fundamenta Mathematicae
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Čech, Eduard, Frolík, Zdeněk, Katětov, Miroslav
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Čech, Eduard, Katětov, Miroslav, Novák, Josef, Švec, Alois
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Karol Borsuk (1959)
Fundamenta Mathematicae
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J. Cao, R. Drozdowski, Zbigniew Piotrowski (2010)
Czechoslovak Mathematical Journal
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We explore (weak) continuity properties of group operations. For this purpose, the Novak number and developability number are applied. It is shown that if is a regular right (left) semitopological group with such that all left (right) translations are feebly continuous, then is a topological group. This extends several results in literature.