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ON A PROBLEM OF TALAGRAND CONCERNING SEPARATELY CONTINUOUS FUNCTIONS
Journal of the Institute of Mathematics of Jussieu ( IF 1.1 ) Pub Date : 2020-02-06 , DOI: 10.1017/s1474748019000677
Volodymyr Mykhaylyuk , Roman Pol

We construct a separately continuous function $e:E\times K\rightarrow \{0,1\}$ on the product of a Baire space $E$ and a compact space $K$ such that no restriction of $e$ to any non-meagre Borel set in $E\times K$ is continuous. The function $e$ has no points of joint continuity, and, hence, it provides a negative solution of Talagrand’s problem in Talagrand [Espaces de Baire et espaces de Namioka, Math. Ann.270 (1985), 159–164].

中文翻译:

关于分离连续函数的塔拉格朗问题

我们构造一个单独的连续函数$e:E\times K\rightarrow \{0,1\}$关于贝尔空间的乘积$E$和紧凑的空间$K$这样就没有限制$e$对任何非微薄的 Borel 设置$E\乘以 K$是连续的。功能$e$没有联合连续点,因此,它提供了 Talagrand 中 Talagrand 问题的否定解 [Espaces de Baire et espaces de Namioka,数学。安。270(1985), 159–164]。
更新日期:2020-02-06
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