Welcome to the website to the Friday Fish seminar at Utrecht University. On this site you can find announcements for upcoming talks, our previous talks, and the reading seminars we are hosting and have hosted.

If you want to add upcoming talks to your calendar, you can use the following iCalandar-link.

Current reading seminar(s)

• Seiberg-Witten theory (Fall 2025)

Upcoming Talks

• February 13, 2026 | Seiberg-Witten theory (Fall 2025)

  Lucas Dahinden - Weinstein conjecture

  Time: 15:00 — Location: HFG 707
• February 20, 2026 | Seiberg-Witten theory (Fall 2025)

  Bas Wensink - TBA

  Time: 15:00 — Location: HFG 707
• February 27, 2026

  Rui Loja Fernandes - Polar groupoids and their resolutions

  Time: 15:00 — Location: HFG 707

Previous Talks

• January 23, 2026 | Seiberg-Witten theory (Fall 2025)

  Bas Wensink, Álvaro del Pino Gómez - Left-over aspects from previous talks

• January 16, 2026 | Seiberg-Witten theory (Fall 2025)

  Jaime Pedregal Pastor, Douwe Hoekstra - Left-over aspects from previous talks

  Video
• December 19, 2025 | Seiberg-Witten theory (Fall 2025)

  Bas Wensink - The Seiberg-Witten equations on cylinders

  Video
• December 5, 2025 | Seiberg-Witten theory (Fall 2025)

  Álvaro del Pino Gómez - Seiberg-Witten invariants of Kähler and symplectic manifolds

  Video
• November 28, 2025 | Seiberg-Witten theory (Fall 2025)

  Lucas Dahinden - Transversality, orientability, defining the invariant

  Video