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YaMCATS (Yorkshire and Midlands Category Theory Seminar) is a category theory research network between the universities of Leeds, Manchester and Sheffield. The network is partially funded by the London Mathematical Society.

Its scope is to provide an opportunity for discussions and collaborations within the category theory community in the UK and beyond, as well as to promote Category Theory across disciplines.

Future meetings (everyone's welcome!)

• Meeting 41: Tuesday 9th June 2026. University of Manchester.
  Speakers:
  • • David Jordan (University of Edinburgh),
    • Vít Jelínek (University of Sussex),
    • Joanna Ko (Topos Institute, Oxford).

  If you wish to attend this meeting, please register by using this link by 12:00noon (UK time) on Thursday 4th June 2026. This will facilitate us organising the coffee breaks and dinner, and preparing the final report of the network, as required by LMS.

• Meeting 42: Late 2026 / early 2027: University of Leeds.

Recent meetings:

• Meeting 34: 16th  April 2024 (University of Sheffield)
• Meeting 35: 20th June 2024 (University of Manchester).
  Meeting # 35 of YaMCATS was a satellite meeting of the: 75th British Mathematical Colloquium, University of Manchester 17th June to 20th June 2024.
• Meeting 36: 24th January 2025 (University of Leeds).
• Meeting 37: 23 April 2025 (University of Sheffield).
• Meeting 38: 23 June 2025 (University of Manchester).
  This was also an LMS Hardy Lecture.
• Meeting 39: 21st January 2026. University of Leeds.
  Speakers:
  • Chris Heunen (University of Edinburgh),
  • Robert Laugwitz (University of Nottingham),
  • Mark Kamsma (Masaryk University, Brno).
• Meeting 40: 16 April 2026. University of Sheffield.
  Speakers:
  • Paula Verdugo, Max Planck Institute for Mathematics (Bonn),
  • Muriel Livernet, Université Paris Cité,
  • Peter Huston, University of Leeds.
• Earlier meetings

• Nicola Gambino (University of Manchester)
• João Faria Martins (University of Leeds)
• Markus Szymik (University of Sheffield)

Website currently maintained by João Faria Martins (University of Leeds), and previously by Federico Olimpieri (University of Leeds)