Every year on 14th March, mathematics enthusiasts celebrate Pi Day, dedicated to the circle constant π, which is used to calculate the circumference and area of a circle. The commemorative day was invented in the United States, where the date format 3/14 recalls π = 3.1415… Since 2020, UNESCO has also called for celebrations of the International Day of Mathematics on 14th March.
Circles in a mathematical world unfamiliar to most people are studied by the theoretical mathematician Professor Annette Werner at Goethe University as part of the Collaborative Research Centre/Transregio GAUS (a Rhine Main Universities’ project). In the world of p-adic numbers, a circle can no longer be visualized in the usual way—it has an infinite number of centers.
The research magazine Forschung Frankfurt reported on her investigations in the issue titled “Alien Worlds”:
A circle with an infinite number of midpoints. The fascinating world of p-adic geometry.
