An explicit structure of the graded ring of modular forms of small level

Suda Tomohiko, Saito Hayato

In this paper, we study the explicit structure of the graded ring of elliptic modular forms for the congruence subgroup ${\Gamma }_0(N)$ with N=1,2,3,4,5,6,7,8,9,10,12,16,18,25. More preci…