Office G3 03

Inselstraße 22

04103 Leipzig

+49 341 9959 806

rosa.winter (at) mis.mpg.de

I am a postdoctoral researcher in the Nonlinear Algebra group
of Bernd Sturmfels at the Max Planck
Institute for Mathematics in the Sciences in Leipzig. Before this I was a PhD student under the supervision of
Martin Bright and Ronald van
Luijk at Universiteit Leiden. In my thesis I worked on the density of rational points and the configurations of lines
on del Pezzo surfaces of degree one, and their relation to torsion points on elliptic fibrations.

Here is my CV (updated February 2021), and here is my PhD thesis.

Here is my CV (updated February 2021), and here is my PhD thesis.

- 11/11/2021 Zoom Algebraic Geometry Seminar (ZAG).

- 5. Density of rational points on a family of del Pezzo surfaces of degree one (with J. Desjardins).
*Submitted.*arXiv (2021), with magma code. - 4. Linear Spaces of Symmetric Matrices with Non-Maximal Maximum Likelihood Degree (with Y. Jiang and K. Kohn).
*Submitted.*arXiv (2020). - 3. Fields of definition of elliptic fibrations on covers of certain extremal
rational ellipic surfaces (with V. Cantoral-Farfán, A. Garbagnati, C. Salgado, and A. Trbović).
*To appear in Women in Numbers Europe III: Research Directions in Number Theory.*arXiv (2020). - 2. Concurrent exceptional curves on del Pezzo surfaces of degree one (with R.
van Luijk).
*Submitted.*arXiv (2019), with magma code 1 and magma code 2. - 1. The action of the Weyl group on the
*E*root system (with R. van Luijk)._{8}*To appear in Graphs and Combinatorics.*arXiv (2019), with magma code. - PhD thesis: Geometry and arithmetic of del Pezzo surfaces of degree 1 (2021).
- Master thesis: Concurrent exceptional curves on del Pezzo surfaces of degree one (2014).
- Bachelor thesis: Elliptic curves over
**Q**_{p}(2011).

- OSCAR code with with some basic commands for number theory in OSCAR.
- Magma code used in Chapter 2 of my PhD thesis.
- Magma code used in Chapter 5 of my PhD thesis.

- 25/02/2021 Number Theory Seminar (online), University of California Irvine.
- 19/02/2021 Zoom On Rational Points (ZORP).
- 02/02/2021 Nonlinear Algebra Seminar Online, MPI-MiS Leipzig.
- 17/12/2020 Séminaire Arithmétique et Théorie de l’Information (online), Aix-Maseille Université.
- 11/11/2020 Algebra Seminar (online), Rijksuniversiteit Groningen.
- 29/10/2020 Quarantined Number Theory and Algebraic Geometry Seminar (online), Simon Fraser University.
- 22/09/2020 Arithmetic Geometry Seminar (online), Ohio State University.
- 03/06/2020 PhD colloquium (online), Universiteit Leiden.
- 14/04/2020 Nonlinear Algebra Seminar Online, MPI-MiS Leipzig.
- 26/02/2020 Heilbronn Number Theory Seminar, University of Bristol.
- 07/02/2020 Intercity Number Theory Seminar, Universiteit Leiden.
- 18/12/2019 Seminario di Natale, Università degli Studi di Milano.
- 11/12/2019 Number Theory Seminar, Københavns Universitet.
- 06/03/2019 Number/Representation Theory seminar, University of Toronto.
- 26/06/2018 Konstanz Women in Mathematics lecture series, Universität Konstanz.
- 31/05/2018 Bernoullis Tafelrunde Graduate Student Seminar, Universität Basel.
- 18/06/2018 Poster at GAeL XXVI, Université de Strasbourg.
- 21/03/2018
*Counting Curves*, Tropical Geometry Seminar, Universiteit Leiden. - 11/09/2017 Poster at Diophantine problems (DIOP), University of Manchester.
- 07/07/2017 Research talk at 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.

- Algebraic Statistics Seminar (fall 2018), co-organized with Rianne de Heide and Garnet Akeyr.
- Tropical Geometry Seminar (spring 2018), co-organized with Garnet Akeyr.
- Obstructions to local-global principles (spring 2017), co-organized with Julian Lyczak and Erik Visse.

- Fall 2016 - Fall 2019 Calculus (Teacher), Leiden University College, The Hague
- Spring 2018 Elliptic curves (Teaching assistant), Dutch Mastermath course
- 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 Eerstde Klas.