arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.07521math.LO
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$P$的可定义完备性-极小域及其应用

Definable completeness of $P$-minimal fields and applications

Pablo Cubides Kovacsics, Françoise Delon

摘要:

证明了$P$ -极小域$K$的闭子集和有界子集的可定义套族都有非空交.作为一个应用程序,我们回答了一个问题的Darnière和Halupczok表明,$P$ -极小域满足“极值属性”:对于每个封闭和有界子集$U\subseteq K$和每个可解释的连续函数$f\colon U \to Γ_K$(其中$Γ_K$表示值组),$f(U)$承认一个最大值。由于他们的工作,还得到了两个推论。第一个例子表明,$K\timesΓ_K^n$的每个可解释子集在环的语言中已经是可解释的,回答了Cluckers和Halupczok的一个问题。这特别意味着每个$P$ -极小域是多项式有界的。第二类刻画了满足经典胞腔制备定理的$P$ -极小域为具有可定义Skolem函数的域,推广了Angligues的一个结果.

英文摘要:

We show that every definable nested family of closed and bounded subsets of a $P$-minimal field $K$ has non-empty intersection. As an application we answer a question of Darnière and Halupczok showing that $P$-minimal fields satisfy the "extreme value property": for every closed and bounded subset $U\subseteq K$ and every interpretable continuous function $f\colon U \to Γ_K$ (where $Γ_K$ denotes the value group), $f(U)$ admits a maximal value. Two further corollaries are obtained as a consequence of their work. The first one shows that every interpretable subset of $K\timesΓ_K^n$ is already interpretable in the language of rings, answering a question of Cluckers and Halupczok. This implies in particular that every $P$-minimal field is polynomially bounded. The second one characterizes those $P$-minimal fields satisfying a classical cell preparation theorem as those having definable Skolem functions, generalizing a result of Mourgues.

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