## Functiones et Approximatio Commentarii Mathematici

### The Picard groups of the stacks $\mathscr{Y}_0(2)$ and $\mathscr{Y}_0(3)$

Andrew Niles

#### Abstract

We compute the Picard group of the stack of elliptic curves equipped with a cyclic subgroup of order two, and of the stack of elliptic curves equipped with a cyclic subgroup of order three, over any base scheme on which $6$ is invertible. This generalizes a result of Fulton-Olsson, who computed the Picard group of the stack of elliptic curves (with no level structure) over a~wide variety of base schemes.

#### Article information

Source
Funct. Approx. Comment. Math. Volume 55, Number 1 (2016), 105-112.

Dates
First available in Project Euclid: 19 September 2016

Permanent link to this document
https://projecteuclid.org/euclid.facm/1474301232

Digital Object Identifier
doi:10.7169/facm/2016.55.1.7

Mathematical Reviews number (MathSciNet)
MR3549015

#### Citation

Niles, Andrew. The Picard groups of the stacks $\mathscr{Y}_0(2)$ and $\mathscr{Y}_0(3)$. Funct. Approx. Comment. Math. 55 (2016), no. 1, 105--112. doi:10.7169/facm/2016.55.1.7. https://projecteuclid.org/euclid.facm/1474301232.

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