## General

 I am a postdoctoral researcher in the Browning Group at the Institute for science and Technology Austria. Before I was a Ph.D. candidate at Leiden University under the supervision of dr. Martin Bright. My research is on arithmetic geometry as I apply geometric techniques to study questions in number theory. I am for example interested in local to global principles such as the Hasse principle and several forms of approximation to both rational and integral points, obstructions to these principles (the Brauer-Manin obstruction, to name one), the counting of points of bounded height, but also effective techniques for points on curves and surfaces. I am fascinated by the endless geometric techniques one can use to study some obvious and seemingly simple questions in number theory. Contact: Julian Lyczak jlyczak (at) ist.ac.at IST Austria Am Campus 1 A – 3400 Klosterneuburg

## Writings

Scientific articles:
Theses:
Here you can find a list of errata of the following notes:
Other people's scientific articles with a (minor) contribution from me:
Miscellaneous:
The "Vakidioot" is the monthly magazine of A-Eskwadraat, the study association for mathematics in Utrecht. "Euclides" is a magazine for high school mathematics teachers. "Pythagoras" is a two-monthly magazine for high school students.

## Code

• Magma code to compute the subgroups of the finite automorphism group of the Picard group of del Pezzo surfaces.
• Magma code to compare the first cohomology groups of subgroups of the Weyl group acting on two free $$\mathbb Z$$-modules. This is used to compare the algebraic Brauer group of a log K3 surface with an irreducible ample anticanonical bundle, to the Brauer group of the corresponding del Pezzo surface.

## Talks

Spring 2020
Autumn 2019
Spring 2019:
Spring 2018:
Autumn 2017:
• Explicit Brauer-Manin obstructions of order 5
At the DIAMANT symposium in Breukelen, The Netherlands.
• Why your piano is never in tune!
A lunch lecture organized by De Leidsche Flesch in Leiden.
Spring 2017:
Spring 2016:
Spring 2015:
Older talks (at the University of Utrecht):

## Seminars, conferences etc.

Upcoming:
Current:
Ongoing: Autumn 2019
Spring 2019
Continuous seminars and colloquia at Leiden and in The Netherlands I attended:
Autumn 2018:
Autumn 2018:
Spring 2018:
Autumn 2017:
Spring 2017:
Autumn 2016:
Spring 2016:
Autumn 2015:
Spring 2015:
Older seminars (at the University of Utrecht):

## Teaching

Spring 2018: Autumn 2017:
Spring 2017:
Autumn 2016:
Spring 2016:
Autumn 2015:
Spring 2015:

## Miscellaneous

A list of links to some of my personal interests: