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arXiv 2010.02420math.LO
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可定义在第二类可定义完备一致局部o-极小结构中的函数

Functions definable in definably complete uniformly locally o-minimal structure of the second kind

Masato Fujita

摘要:

研究了可定义在稠密线性序阿贝尔群(DCULOAS结构)的第二类可定义完备一致局部O-极小展开式中的连续函数.我们证明了一个变种的Arzela-Ascoli定理的一致连续可定义的功能和以下断言:考虑参数化的功能$f:C \times P \rightarrow M$这是等连续的$P$。当$C$是封闭且有界的时,$f$在其处不连续的集合到参数空间$P$的投影图像的维数小于$\dim P$。此外,我们证明了阿基米德DCULOAS结构,享有可定义的Tietze扩张性质是O-最小的。在附录中,我们证明了序群的o-极小扩张不是半有界的当且仅当它具有可定义的Tietze扩张性质。

英文摘要:

We investigate continuous functions definable in a definably complete uniformly locally o-minimal expansion of the second kind of a densely linearly ordered abelian group (DCULOAS structure). We prove a variant of the Arzela-Ascoli theorem for uniformly continuous definable functions and the following assertion: Consider the parameterized function $f:C \times P \rightarrow M$ which is equi-continuous with respect to $P$. The projection image of the set at which $f$ is discontinuous to the parameter space $P$ is of dimension smaller than $\dim P$ when $C$ is closed and bounded. In addition, we demonstrate that an archimedean DCULOAS structure which enjoys definable Tietze extension property is o-minimal. In the appendix, we show that an o-minimal expansion of an ordered group is not semi-bounded if and only if it enjoys definable Tietze extension property.

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