Journal of Number Theory ( IF 0.6 ) Pub Date : 2021-03-02 , DOI: 10.1016/j.jnt.2021.01.020 A. Grishkov , D. Logachev
Let M be an Anderson t-motive of dimension n and rank r. Associated are two -modules , of dimensions , - analogs of , for an abelian variety A. There is a theorem (Anderson): ; in this case M is called uniformizable. It is natural to expect that always . Nevertheless, we explicitly construct a counterexample. Further, we answer a question of D. Goss: is it possible that two Anderson t-motives that differ only by a nilpotent operator N are of different uniformizability type, i.e. one of them is uniformizable and other not? We give an explicit example that this is possible. Finally, explicit formulas for calculation of , obtained in the present paper will be used in future for systematic calculation of , of all Anderson t-motives. Moreover, the first step of this calculation (for a class of t-motives) is already made in a forthcoming paper of the authors.
中文翻译:
h 1 ≠ h 1对于安德森t动机
令M为维度n和等级r的安德森t动机。关联的是两个-模块 , 尺寸 , -类似物 , 用于阿贝尔各种甲。有一个定理(安德森):; 在这种情况下,M被称为可均匀化的。很自然地希望总是。但是,我们明确构造了一个反例。进一步,我们回答D.戈斯的问题:两个仅由幂等算子N区别的安德森t动机是否可能具有不同的均匀性类型,即其中一个是可均匀化的而其他不是?我们给出一个明确的例子,证明这是可能的。最后,用于计算的显式公式, 本文中获得的结果将在将来用于系统地计算 , 所有安德森(Anderson)的动机。此外,该计算的第一步(针对一类t动机)已经在即将发表的作者论文中进行了。