Modular units and cuspidal divisor classes on X0(n2M) with n|24 and M squarefree
Modular units and cuspidal divisor classes on X0(n2M) with n|24 and M squarefree
复制标题
X0(n2M) 上的模单位和尖除数类,n|24 和 M squarefree
DOI:
10.1016/j.jalgebra.2020.05.041
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发表时间:
2020-07
影响因子:
0.9
通讯作者:
Yifan Yang
中科院分区:
文献类型:
--
作者:
Liuquan Wang;Yifan Yang
For a positive integer N, let C (N) be the subgroup of J 0 (N) generated by the equivalence classes of cuspidal divisors of degree 0 and C (N)(Q):= C (N)∩ J 0 (N)(Q) be its Q-rational subgroup. Let also C Q (N) be the subgroup of C (N)(Q) generated by Q-rational cuspidal divisors. We prove that when N= n 2 M for some integer n dividing 24 and some squarefree integer M, the two groups C (N)(Q) and C Q (N) are equal. To achieve this, we show that all modular units on X 0 (N) on such N are products of functions of the form η (m τ+ k/h), m h 2| N and k∈ Z and determine the necessary and sufficient conditions for products of such functions to be modular units on X 0 (N).
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影响因子:
1.4
作者:
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通讯作者:
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DOI:
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1972-02
期刊:
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影响因子:
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