The Open Seminar provides a platform for students and researchers to present their work, discuss new ideas, and explore a broad range of mathematical topics in a collaborative and friendly environment.

The seminar is hosted by the School of Mathematical Sciences at Hebei Normal University (HebNU) and organized by Salvatore Tringali and Liping Yuan. It features a mix of guests and members of the local academic community as speakers. Unless otherwise specified, all talks are

Thursday 3:00–4:00 PM (Beijing time) · HebNU School of Mathematical Sciences, Room D203

To enable participants from around the world, we stream the seminar on Zoom via the link:

https://us06web.zoom.us/j/86763384947?pwd=qXhOzOcHvaaiw2jqADI8iqNavdgm14.1

To receive announcements about upcoming talks, please send an email to one of the organizers.

Prospective speakers are encouraged to submit both the TeX file and a PDF version of their abstract, including a short academic bio, to Salvatore Tringali (contact details) using the template available here.

Spring–Summer 2026

March 12, 2026 · 3:00–4:00 PM (Beijing time) · online
Dein WONG · School of Mathematics, China Univ. of Mining and Technology (Xuzhou, China)
On automorphism groups of power semigroups over numerical semigroups (abstract · slides)
March 19, 2026 · 3:00–4:00 PM (Beijing time) · in person
Weihao YAN · School of Mathematical Sciences, Hebei Normal Univ. (Shijiazhuang, China)
Torsion groups and the Bienvenu–Geroldinger conjecture (abstract · slides)
March 26, 2026 · 3:00–4:00 PM (Beijing time) · online
Paolo LEONETTI · Dept. of Economics, University of Insubria (Varese, Italy)
To be announced (abstract · slides)
April 2, 2026 · 3:00–4:00 PM (Beijing time) · in person
Kerou WEN · School of Mathematical Sciences, Hebei Normal Univ. (Shijiazhuang, China)
On the automorphisms of numerical power semigroups (abstract · slides)
April 9, 2026 · 3:00–4:00 PM (Beijing time) · online
Balint RAGO · Dept. of Mathematics and Scientific Computing, Univ. of Graz (Graz, Austria)
To be announced (abstract · slides)
April 16, 2026 · 3:00–4:00 PM (Beijing time) · online/in person
Free slot ·
To be announced (abstract · slides)
April 23, 2026 · 2:00–3:00 PM (Beijing time) · online
Zachary MESYAN · Dept. of Mathematics, University of Colorado (Colorado Spring, USA)
Factorization in Finitely-Presented Monoids (abstract · slides)
April 30, 2026 · 3:00–4:00 PM (Beijing time) · online
Andreas REINART · Dept. of Mathematics and Scientific Computing, Univ. of Graz (Graz, Austria)
To be announced (abstract · slides)

Fall–Winter 2025

John Doe · University of Joy, Serendipity
Recent trends in the theory of summer holidays (slides)

Mario Rossi · Paramount Institute of Gattology, Venus
Cats and the maximum meowing principle (slides)