We provide a finite basis for the class of Borel functions that are not in the first Baire class, as well as the class of Borel functions that are not $\sigma $ -continuous with closed witnesses.

中文翻译：

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超越第一类的功能基础

我们为不属于第一个 Baie 类的 Borel 函数类以及不属于第一类的 Borel 函数类提供了有限基$\西格玛$- 与封闭的证人继续。