# Density of rational points on a family of del Pezzo surface of degree 1

*Julie Desjardins (Toronto)*

**Fri May 8, 17:45-18:45 (3 weeks ago)**

**Abstract: **Let $k$ be a number field and $X$ an algebraic variety over $k$. We want to study the set of $k$-rational points $X(k)$. For example, is $X(k)$ empty? If not, is it dense with respect to the Zariski topology? Del Pezzo surfaces are classified by their degrees $d$ (an integer between 1 and 9). Manin and various authors proved that for all del Pezzo surfaces of degree $>1$ is dense provided that the surface has a $k$-rational point (that lies outside a specific subset of the surface for $d=2$). For $d=1$, the del Pezzo surface always has a rational point. However, we don't know it the set of rational points is Zariski-dense. In this talk, I present a result that is joint with Rosa Winter in which we prove the density of rational points for a specific family of del Pezzo surfaces of degree 1 over $k$.

The discussion for Julie Desjardinsâ€™s talk is taking place not in zoom-chat, but at tinyurl.com/stagMay08a (and will be deleted after 3-7 days).

algebraic geometry

Audience: researchers in the topic

**Stanford algebraic geometry seminar **

**Series comments: **Seminar meets 11-12:30 pm pacific time when there is just one talk, and 10:45-11:45 and 12-1 pm pacific time when there is a double header.

Register in advance for this meeting: stanford.zoom.us/meeting/register/tJEvcOuprz8vHtbL2_TTgZzr-_UhGvnr1EGv

More seminar information: agstanford.com

Organizers: | Isabel Vogt*, Ravi Vakil* |

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