On this website I present some of my work, thoughts and ideas on selected topics in mathematics. These range from conjectures over abstract ideas to rigorous proofs. My main fields of research are number theory and graph theory. If a problem has grabbed me, I worked on it over many years. My favorite topics are the 3x + 1 problem, regular matchstick graphs and aperiodic tilings.

In the hope to enrich the mathematical world a little bit, enjoy reading and exploring.