期刊
JOURNAL OF NUMBER THEORY
卷 129, 期 12, 页码 2952-2990出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jnt.2009.04.014
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This paper deals with two problems arising in the study of Drinfeld quasi-modular forms. The first problem is to find the maximal order of vanishing at infinity of a non-zero Drinfeld quasi-modular form and leads to the notion of extremal quasi-modular form (highest possible order of vanishing for fixed weight and depth). The second problem is determining differential properties of extremal forms, leading to the notion of differentially extremal form From our investigations, we will obtain an upper bound for the order of vanishing at infinity of non-zero Drinfeld quasi-modular forms of small depths The paper ends with a collection of tools used in the previous parts. The notion of extremal form is similar to one introduced by Kaneko and Koike in [M. Kaneko, M. Koike, On extremal quasimodular forms. Kyushu J Math. 60 (2006) 457-470] (C) 2009 Elsevier Inc. All rights reserved.
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