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arXiv 1306.1802math.LO
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具有有限或伪有限剩余域的Hensel值域中一致定义的赋值环

Uniformly defining valuation rings in Henselian valued fields with finite or pseudo-finite residue fields

Raf Cluckers, Jamshid Derakhshan, Eva Leenknegt, Angus Macintyre

摘要:

我们用环语言定义了Q_p中的Z_p和F_p((t))中的F_p[[t]],该定义对所有$p$和这些域的所有有限域扩展以及许多其他Henselian值域都一致适用。这个公式在环语言中可以被认为是存在-普遍的,而事实上在麦金太尔语言的一种修改中也是存在的。进一步证明了在环的语言中,对于给定的Henselian值域的所有有限扩张的赋值环,不存在由存在公式给出的统一定义,也不存在由泛公式给出的统一定义.对于Q_p的任意固定有限扩张,给出了定义赋值环的环语言存在公式和环语言泛公式.

英文摘要:

We give a definition, in the ring language, of Z_p inside Q_p and of F_p[[t]] inside F_p((t)), which works uniformly for all $p$ and all finite field extensions of these fields, and in many other Henselian valued fields as well. The formula can be taken existential-universal in the ring language, and in fact existential in a modification of the language of Macintyre. Furthermore, we show the negative result that in the language of rings there does not exist a uniform definition by an existential formula and neither by a universal formula for the valuation rings of all the finite extensions of a given Henselian valued field. We also show that there is no existential formula of the ring language defining Z_p inside Q_p uniformly for all p. For any fixed finite extension of Q_p, we give an existential formula and a universal formula in the ring language which define the valuation ring.

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