Graded rings of modular forms of rational weights
Graded rings of modular forms of rational weights
复制标题
有理权重模块化形式的分级环
DOI:
10.1007/s40993-019-0183-9
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发表时间:
2020
影响因子:
0.8
通讯作者:
Tomoyoshi Ibukiyama
中科院分区:
文献类型:
--
作者:
安福 悠;吉田健一,奥間智弘,渡辺敬一;Akinari Hoshi;Tomoyoshi Ibukiyama
In a previous paper, for any odd integerwe constructedmodular forms ofof rational weightand proved that the graded rings of modular forms of weight() are generated by our forms for, 7, 9. The proof was given by a direct calculation of the structure of the ring. In this paper, we generalize the result to cases whenand 13 by using Castelnuovo–Mumford criterion on normal generation and Fujita criterion on relations of sections of invertible sheaves. For this purpose, it is needed to handle modular forms of small weight where Riemann Roch theorem has cohomological obstruction. Both rings forand 13 are generated by 5 and 6 generators with 15 and 35 concrete fundamental relations, respectively. These relations also give equations of the corresponding modular varieties. We will show that the similar claim does not hold forand. We also give remarks on relations of some theta constants and further problems.
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DOI:
10.1017/cbo9780511569197.013
发表时间:
1977
期刊:
--
影响因子:
--
作者:
T. Fujita
通讯作者:
T. Fujita
DOI:
10.1007/978-3-0348-8594-2_8
发表时间:
1993
期刊:
--
影响因子:
--
作者:
F. Klein;P. Slodowy
通讯作者:
P. Slodowy
影响因子:
1.7
作者:
J. Igusa
通讯作者:
J. Igusa
影响因子:
0.7
作者:
Hershel M. Parkas;Y. Kopeliovich;I. Kra
通讯作者:
I. Kra
影响因子:
1.4
作者:
F. Klein
通讯作者:
F. Klein