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ON THE DIFFERENCES OF LOWER SEMICONTINUOUS FUNCTIONS

机译:关于低半连续函数的差异

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摘要

Answering one of the real function problems suggested by A. Ma-liszewski, the existence of a bounded Darboux function of the Sierpinski first class that cannot be expressed as a difference of two bounded lower semicontinuous functions is proved. As the reply to the other Mal-iszewski question, we show there exists an almost everywhere continuous Darboux function of the Sierpinski first class that is not a difference of two almost everywhere continuous lower semicontinuous functions.
机译:回答了A. Ma-liszewski提出的一个实函数问题,证明了Sierpinski第一类的有界Darboux函数的存在,该函数不能表示为两个有界下半连续函数的差。作为对其他Mal-iszewski问题的答复,我们显示了Sierpinski第一类几乎在每个地方都有连续的Darboux函数,这与两个几乎每个地方都在连续的下半连续函数之间没有区别。

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