###### 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 😅).

###### 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.

###### 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).

###### 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.

###### 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, resulting in the text below. The article did not appear yet – but as soon as it does, I’ll update this blog entry with a link to it.

###### 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.

###### Talk @ AofA18: Counting Ascents in Generalized Dyck Paths

Last week I participated at AofA18 in Uppsala, Sweden and gave a talk on Friday.

###### 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:

###### 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.

###### 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.

###### 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.

###### 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.

###### 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.

###### Talk @ ANALCO17: Iterative Cutting and Pruning of Planar Trees

I gave a talk at the 2017 Meeting on Analytic Algorithmics and Combinatorics (ANALCO17).

###### 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”.

###### 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.

###### 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.

###### 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.

###### 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 solutions.

###### 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.

###### 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 tasks within my Google Summer of Code project are:

###### 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.

###### 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?”. The question got me interested, and so I decided to do some counting.

###### 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.

###### 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.

###### 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: