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A class of topological semigroups [PDF]

open access: yesMathematische Annalen, 1970
KIST, J., LEESTMA, S.
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The characteristic semigroup of a topological space

open access: yesGeneral Topology and its Applications, 1975
AbstractThe main result of this paper is that two T2 topological spaces are homeomorphic if and only if their corresponding characteristic semigroups are isomorphic. Certain classes of topological spaces are then characterized in terms of their characteristic semigroups.
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