Ax-Schanuel and strong minimality for the j-function
Ax-Schanuel and strong minimality for the j-function
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Ax-Schanuel 和 j 函数的强极简性
DOI:
10.1016/j.apal.2020.102871
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发表时间:
2021
影响因子:
0.8
通讯作者:
Aslanyan V
中科院分区:
文献类型:
--
作者:
Aslanyan V
Abstract Let K:=(K;+,⋅, D, 0, 1) be a differentially closed field of characteristic 0 with field of constants C. In the first part of the paper we explore the connection between Ax-Schanuel type theorems (predimension inequalities) for a differential equation E (x, y) and the geometry of the fibres U s:={y: E (s, y)∧ y∉ C} where s is a non-constant element. We show that certain types of predimension inequalities imply strong minimality and geometric triviality of U s. Moreover, the induced structure on the Cartesian powers of U s is given by special subvarieties. In particular, since the j-function satisfies an Ax-Schanuel inequality of the required form (due to Pila and Tsimerman), applying our results to the j-function we recover a theorem of Freitag and Scanlon stating that the differential equation of j defines a strongly minimal set with trivial geometry. In the second part of the paper we study strongly minimal sets in the j-reducts of differentially closed fields. Let E j (x, y) be the (two-variable) differential equation of the j-function. We prove a Zilber style classification result for strongly minimal sets in the reduct K:=(K;+,⋅, E j). More precisely, we show that in K all strongly minimal sets are geometrically trivial or non-orthogonal to C. Our proof is based on the Ax-Schanuel theorem and a matching Existential Closedness statement which asserts that systems of equations in terms of E j have solutions in K unless having a solution contradicts Ax-Schanuel.
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DOI:
10.4007/annals.2020.192.3.2
发表时间:
2018
期刊:
arXiv: Algebraic Geometry
影响因子:
--
作者:
G. Casale;J. Freitag;Joel Nagloo
通讯作者:
Joel Nagloo
影响因子:
1.4
作者:
V. Aslanyan
通讯作者:
V. Aslanyan
DOI:
10.24033/asens.2296
发表时间:
2016
期刊:
Annales scientifiques de l'École normale supérieure
影响因子:
--
作者:
Pila J
通讯作者:
Pila J
影响因子:
0.8
作者:
B. Zilber
通讯作者:
B. Zilber
DOI:
--
发表时间:
2013
期刊:
Notre Dame J. Formal Log.
影响因子:
--
作者:
J. Pila
通讯作者:
J. Pila