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Notes on star Lindelof space

机译:关于Lindelof空间的注意事项

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In this paper, we prove that the cardinality of a star Lindelof space X does not exceed c if X satisfies one of the following conditions: (1) X has a rank 3-diagonal; (2) X is normal and has a rank 2-diagonal; (3) X is first countable, normal and has a G(delta)-diagonal. Moreover, we also obtain several results concerning the general question "When must a star Lindelof space be star countable?". (C) 2016 Elsevier B.V. All rights reserved.
机译:本文证明,如果X满足以下条件之一,则星形Lindelof空间X的基数不超过c:(1)X具有等级3对角线; (2)X是正常的,具有2对角等级; (3)X首先是可数的,正常且具有Gδ对角线。此外,我们还获得了有关一般问题“星Lindelof空间何时必须可数星”的几个结果。 (C)2016 Elsevier B.V.保留所有权利。

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