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Questions about modular forms and related areas

23 votes
3 answers
4k views

Subgroups of GL(2,q)

I have been wondering about something for a while now, and the simplest incarnation of it is the following question: Find a finite group that is not a subgroup of any $GL_2(q)$. Here, $GL_2(q)$ …
Bertie Wooster's user avatar
4 votes
1 answer
725 views

Rational points on $X_0(15)$

The modular curve $X_0(15)$ has a canonical model over $\mathbf{Q}$, and it has genus $1$. As the cusp $\infty$ is rational, it is an elliptic curve. Roughly, my question is whether we can find all th …
Bertie Wooster's user avatar
2 votes
1 answer
530 views

Is there a Miller basis for M_k(N)?

The space $M_k(1)$ of modular forms of level $1$ has a unique basis $\left\{ f_0,f_1,\ldots,f_d\right\}$ such that $a_i(f_j) = \delta_{ij}$ for all $0\leq i,j \leq d$, and $f_i \in \mathbb{Z}[[q]]$ f …
Bertie Wooster's user avatar