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A note on the Menger (Rothberger) property and topological games

机译:有关Menger(Rothberger)属性和拓扑游戏的说明

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In this note we show that a T-1 topological space X is a Menger space if and only if for each sequence {phi(n) : n is an element of w} of neighborhood assignments for X, there exists, for each n is an element of w, a finite subset D-n of X such that X = U{phi(n)(d) d is an element of D-n, n is an element of w} and D = U{D-n : n is an element of w} is a closed discrete subspace of X. A T-1 topological space X is a Rothberger space if and only if for each sequence {phi(n) : n is an element of w} of neighborhood assignments for X, there exists, for each n is an element of w, a point d(n) is an element of X such that X = U{phi(n)(d(n)) : n is an element of w} and D = {d(n) : n is an element of w} is a closed discrete subspace of X.
机译:在本注释中,我们证明,当且仅当对于每个序列{phi(n):n是x的邻域赋值的元素存在,并且每个n为n,T-1拓扑空间X都是Menger空间。 w的元素,X的有限子集Dn,使得X = U {phi(n)(d)d是Dn的元素,n是w}的元素,D = U {Dn:n是X的元素w}是X的封闭离散子空间。T-1拓扑空间X是Rothberger空间,当且仅当对于每个序列{phi(n):n是X的邻域赋值的w}的一个元素存在,对于每个n是w的元素,点d(n)是X的元素,使得X = U {phi(n)(d(n)):n是w的元素,D = {d( n):n是w}的元素,是X的封闭离散子空间。

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