Lebesgue measurableset and the complete and nowhere dense set are two kinds of important set and are the important content in the real variable function.
勒贝格可测集和疏朗完备集是两类重要集合，是实变函数中的重要内容。
2
We know the structure way of the one-dimension no-measurableset, in this paper we first define a amicable set using a mapping, then we give a two-dimension non-measurableset.
Set up measurable goals, such as increasing CTR by 2% and reducing costs by 5%, then complete the keyword research, write AD creative, and define compelling offers.