A note concerning the Collins, Reed, Ros
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Yin-Zhu Gao
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Article
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1996
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Elsevier Science
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English
โ 424 KB
We investigate conditions varying on VV(x): x E X, where each ~V(z) is a countable family of subsets containing x. Characterizations and mapping properties of them are obtained. New criteria for a-spaces arc given.