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Statements
1988
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representations of commutative semigroups as classes of topological spaces
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countable commutative semigroups
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finitely productive
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closed under countable coproducts
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\(F_{\sigma \delta }\)-subsets
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\(G_{\delta \sigma }\)-subsets
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Cantor discontinuum
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countable, commutative, ordered semigroup
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retract
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