Comments on some Wallace's problems on topological semigroups
P. Mostert (1963)
Colloquium Mathematicae
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P. Mostert (1963)
Colloquium Mathematicae
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A. Wallace (1961)
Fundamenta Mathematicae
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Karl Heinrich Hofmann (1965-1966)
Séminaire Dubreil. Algèbre et théorie des nombres
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R. Hunter (1963)
Fundamenta Mathematicae
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Štefan Schwarz (1986)
Mathematica Slovaca
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R. Hunter (1961)
Fundamenta Mathematicae
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