Niels Bohrweg 1

2333 CA Leiden

+31 71 527 7146

r.l.winter (at) math.leidenuniv.nl

Here is my CV.

I am a PhD Student in arithmetic geometry, under the supervision of Martin Bright
and Ronald van Luijk at Universeit Leiden. My research is on the density of rational points and the configurations of lines on del Pezzo
surfaces of degree one, and torsion points on elliptic fibrations.
My thesis is scheduled to be finished in the spring of 2020 and I am currently looking for postdoc positions starting in the fall of 2020.

- Concurrent exceptional curves on del Pezzo surfaces of degree one . Joint with Ronald van Luijk. arXiv:1906.03162.
- The action of the Weyl group
on the
*E*root system . Joint with Ronald van Luijk. arXiv:1901.06945, with magma code._{8}

- Algebraic Statistics Seminar, organized by Rianne de Heide, Garnet Akeyr, and me in the fall of 2018.
- Tropical Geometry Seminar, organized by Garnet Akeyr and me in the spring of 2018.
- Obstructions to local-global principles, organized by Julian Lyczak, Erik Visse, and me in the spring of 2017.

- 26/02/2020 Heilbronn Number Theory Seminar, University of Bristol.
- 07/02/2020 Intercity Number Theory Seminar, Universiteit Leiden.
- 17-18/12/2019
*Density of rational points on a family of del Pezzo surfaces of degree one*, Seminario di Natale, Università degli Studi di Milano. - 11/12/2019
*Density of rational points on a family of del Pezzo surfaces of degree one*, University of Copenhagen. - 06/03/2019
*Concurrent lines on del Pezzo surfaces of degree one*, Number/Representation Theory seminar, University of Toronto. - 26/06/2018
*Configurations of lines on del Pezzo surfaces*, Konstanz Women in Mathematics lecture series, Universität Konstanz. - 31/05/2018
*Configurations of lines on del Pezzo surfaces*, Bernoullis Tafelrunde Graduate Student Seminar, Universität Basel.

- 18/06/2018
*Concurrent exceptional curves on del Pezzo surfaces of degree one*(poster), Géométrie Algébrique en Liberté (GAeL XXVI), Université de Strasbourg. - 21/03/2018
*Counting Curves*, Tropical Geometry Seminar, Universiteit Leiden. - 11/09/2017
*Concurrent exceptional curves on del Pezzo surfaces of degree one*(poster), Diophantine problems (DIOP), University of Manchester. - 07/07/2017
*Concurrent exceptional curves on del Pezzo surfaces of degree one*, XXX-èmes Journées Arithmétiques, Université de Caen Normandie. - 15/02/2017
*Introduction to local-global principles: the Hasse principle and weak approximation*, Seminar 'Obstructions to local-global principles', Universiteit Leiden. - 02/11/2016
*Isogenies*, Seminar 'Good reduction of Abelian Varieties', University of Amsterdam.

- Fall 2019 Calculus (Teacher), Leiden University College, The Hague
- Fall 2018 Calculus (Teacher), Leiden University College, The Hague
- Spring 2018 Elliptic curves (Teaching assistant), Dutch Mastermath course
- Fall 2017 Calculus (Teacher), Leiden University College, The Hague
- Fall 2016 Calculus (Teacher), Leiden University College, The Hague
- Fall 2013 Rational Points on Varieties (Teaching assistant), Dutch Mastermath course

From 2014 until 2016 I was a mathematics teacher at Calandlyceum Amsterdam, as part of the traineeship Eerst de Klas.