2024
A Tale about Typesetting with Typst vs. TeX
For any of the following to actually make sense, I'll need to make a confession first. Not in the "dark secret" sort of category actually, it probably isn't even particularly surprising, and I even know quite a lot of colleagues that feel in a similar way.
2022
New talk at AofA22, and a note on typesetting math with reveal.js
I had the pleasure of presenting recent joint work with Alois Panholzer and Stephan Wagner on the analysis of a stochastic process involving iteratively uncovering the vertices and edges of labeled trees at AofA22. While preparing the slides for my talk (see embed below), I stumb…
From rolling dice to differential equations: a discussion of four generating function problems
In this ~~video~~ blog post, I want to discuss the four exercises that 3blue1brown left at the end of his latest video, plus some additional background and context from the point of view of someone who works with generating functions a lot. Note: This article is, in a sense, the…
Manim on a Raspberry Pi
Due to one of the libraries that Manim depends on ( skia pathops ) not specifically supporting the architecture of Raspberry Pi, trying to install manim might lead to an error that reads along the lines of this: This is a problem outside of Manim, and can only be fully resolved w…
2021
A Report from Uppsala
It's time for an update! A lot of stuff has happened in the past few weeks, and I think my blog is a good space to keep track of it all (at least a bit 😅). 🇦🇹 → 🇸🇪 You would think that relocating during a global pandemic would be a rather complex endeavour and well, you…
2020
Goodbye, Summer interns of 2020!
For the past four weeks, my colleague Roswitha Rissner and I supervised five young mathematicians who joined our department as summer interns. View tweet Their task was to create short animated explanation videos for some elementary mathematical concepts they were interested in a…
Mathematician tackles Austrian school leaving exam: BHS edition
After a lot of positive feedback for my video regarding the school leaving exam, I decided to do the same thing for the school leaving exam in mathematics for a different Austrian school type (BHS). And again, it was fun to stream on my Twitch channel, the resulting video can be…
Mathematician tackles Austrian school leaving exam
As there was some controversy regarding the difficulty of the Austrian school leaving exam in mathematics, I got interested and wanted to check things out for myself. I streamed the whole thing on my Twitch channel, and I've uploaded the whole thing (sorry, its in German!) to You…
Technology for Online Teaching during Social Distancing
For some reason, my students this semester are happy with what I have done to move my classes to online formats (which, of course, was neccessary due to COVID 19). A friend asked me to write an article containing my views and recommendations for online teaching for a magazine, re…
2018
Workshops @ BRG Viktring: Von Büchern, Tauben und den Türmen von Hanoi
Es war mir eine große Freude, wieder einmal in meine alte Schule, dem Bundesrealgymnasium Klagenfurt Viktring zurückzukehren um Mathematik Workshops mit allen siebenten Klassen abzuhalten. Die Workshops hatten das Ziel, die Schülerinnen und Schüler auf der einen Seite auf eine Re…
Talk @ AofA18: Counting Ascents in Generalized Dyck Paths
Last week I participated at AofA18 in Uppsala, Sweden and gave a talk on Friday. The slides can be found on my Talks page.
Goodbye Wordpress, Hello Jekyll!
I am currently in the process of migrating my old Wordpress site to a collection of static pages, generated by Jekyll. I am migrating because of the following reasons: Maintaining personal information (talks, publications, CV) will be a lot easier here as I can build a somewhat a…
Talk: Ascents in Non-Negative Lattice Paths
Today, in the last week of my four week research stay at Stellenbosch University, I gave a talk on a recent cooperation with Clemens Heuberger and Helmut Prodinger. The slides of my talk can be found on my Talks page.
2017
Seminar: Analysis of a Growth Process for Plane Trees
This week I am giving a two part talk series in Mark Ward's informal seminar on Analytic Combinatorics at Purdue University. Abstract. We consider a growth process generating a special subclass of plane trees and carry out the asymptotic analysis of parameters related to this pro…
Schulvortrag @ BRG Viktring
Es war mir eine besondere Freude, heute in meiner ehemaligen Schule, dem BRG Viktring, einen Vortrag aus Mathematik vor den 7. Klassen halten zu dürfen. Meine Vortragsfolien finden sich in der Übersicht auf meiner "Talks" Seite.
Summer School: Techniques in Random Discrete Structures
I'm currently in Athens at the summer school "Techniques in Random Discrete Structures", where I am responsible for the exercise sessions. An overview over which exercises have already been dealt with can be found here. The current versions of the three exercise sheets are availa…
Talk: On Reductions of Plane Trees
I’m currently visiting my mentor Helmut Prodinger at Stellenbosch University in South Africa, and today I gave a talk in the local colloquium. The slides can be found on my Talks page.
Talk @ ANALCO17: Iterative Cutting and Pruning of Planar Trees
I gave a talk at the 2017 Meeting on Analytic Algorithmics and Combinatorics (ANALCO17). The slides can be found on my Talks page.
2016
Mathematik-Seminar der Hans-Riegel-Stiftung
Today I held an invited workshop on combinatorics and the symbolic method at the Mathematical Institute of Bonn University (Bonn, Germany) for alumni who received a "Hans Riegel Fachpreis". The (german) slides and corresponding exercises can be found here (lecture slides) and her…
Talk @ AEC2016: On Reductions of Rooted Plane Trees
Today I gave a talk at AEC Summerschool 2016 at JKU’s Research Institute for Symbolic Computation (RISC) in Hagenberg, Austria. The slides can be found on my Talks page.
Talk @ AofA16: The Register Function and Reductions of Binary Trees and Lattice Paths
On July 8, I gave a contributed talk at this years 27th edition of the International Conference on Probabilistic, Combinatorial and Asymptotic Methods for the Analysis of Algorithms (AofA’16), which took place in Kraków, Poland. The slides can be found on my Talks page.
Talk: On a Reduction of Lattice Paths
Today I gave a talk at Stellenbosch University (South Africa) presenting my current research on a reduction procedure for two dimensional lattice paths consisting of the four steps up, right, down, left. The slides can be found on my Talks page.
Jupyterhub with SageMath Kernel
Recently I made some efforts to get a Jupyterhub instance with a SageMath kernel up and running on one of my servers — with success! 🙂 Actually, the installation is really not that difficult. Nevertheless, I want to write a few lines describing the troubles I ran into and my sol…
2015
Google Summer of Code 2015: Conclusion
The "Google Summer of Code 2015" program has ended yesterday, on the 21. of August at 19.00 UTC. This blog entry shall provide a short wrap up of our GSoC project. The aim of our project was to implement a basic framework that enables us to do computations with asymptotic express…
Asymptotic Expressions: Current Developments
Since my last blog entry on the status of our implementation of Asymptotic Expressions in SageMath quite a lot of improvements have happened. Essentially, all the pieces required in order to have a basic working implementation of multivariate asymptotics are there. The remaining…
Computing with Asymptotic Expressions
It has been quite some time since my last update on the progress of my Google Summer of Code project, which has two reasons. On the one hand, I have been busy because of the end of the semester, as well as because of the finalization of my Master’s thesis — and on the other hand,…
House(s) of Cards
When I sat at our family dinner on Saturday, I watched my cousin build a house of cards from coasters. At one point he said to me: "I want to build a reeeally tall house of cards. One with like 100 levels! Do you think we could collect enough coasters from the tables around here?…
Asymptotic Expressions: Motivation
So, as Google Summer of Code started on Monday, May 25th it is time to give a proper motivation for the project I have proposed. The working title of my project is (Multivariate) Asymptotic Expressions , and its overall goal is to bring asymptotic expressions to SageMath. What ar…
Algebraic Function Fields of Genus 0
In this post I want to discuss the exercises from our Algebraic Curves course I worked on (and struggled with) last week. So, first of all: unfortunately, this post will not be entirely self containing. There are quite a few statements upon which the statement I write about is bu…
Google Summer of Code — Countdown
Today I received the welcome package for attending this year's "Google Summer of Code"! Actually, it's pretty cool; the following things were included: a blue notebook with a monochromatic GSoC 15 logo (in dark blue) printed on it a sticker with a colored GSoC 15 logo a pen that…