PhD Student Symposium: Categories and Companions

David Wood

  •  8 Jun 2021 - 12 Jun 2021
     8:00 am - 10:30 pm

Bryce Clarke (Macquarie University)
Matthew Di Meglio (UNSW Sydney)
Nicola Di Vittorio (Macquarie University)
Eli Hazel (Macquarie University)
Yuki Maehara (Kyushu University)
Adrian Miranda (Macquarie University)
Giacomo Tendas (Macquarie University)
Paula Verdugo (Macquarie University)
Giulian Wiggins (University of Sydney)


Category theory is a branch of mathematics which seeks to understand abstract mathematical structures and the relationships between them. Originating in investigations of connections between algebra and topology, category theory has broad applications across various branches of pure mathematics, as well as logic, computer science, linguistics and physics.

Categories and Companions Symposium 2021 (CaCS2021) is an event for research students (Honours/Masters/PhD) in category theory and related disciplines from around the world to meet each other and share their work. Everyone is welcome to attend the event. Each day will feature a 50 minute talk by an invited speaker and a series of 20 minute contributed talks by research students, split across two sessions — the first aimed at Australasian and American time zones and the second at Australasian, African and European time zones. Attendees will also have the opportunity to meet and talk to each other in smaller groups at various times throughout the symposium.

Contact: If you have any questions, please don’t hesitate to contact the organisers at 

Further information:

John Baez, University of California, Riverside
Emily Riehl, Johns Hopkins University
Eugenia Cheng, School of Art Institute of Chicago
Tobias Fritz, University of Innsbruck
Ross Street, Macquarie University

Program Structure: 
The symposium will take place online via Zoom from Tuesday June 8 to Saturday June 12 in 2021 (AEST/GMT+10). Each day will consist of two sessions, timed so that Session 1 best accommodates Australasian and American time zones and Session 2 best accommodates Australasian and European time zones.

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All dates and times given in the timezone UTC+10.


  • Registration form 
  • Registration is now open via the linked Google Form. In your registration, you may express your interest to give a short 20 minute talk in category theory and/or category theory adjacent topics. When deciding who will speak, preference will be given to research students (Honours/Masters/PhD).
  • The registration deadline for speakers is now closed
  • The registration deadline for non-speaking attendees is Friday, June 4, 2021 23:59:59 Anywhere on Earth.

This symposium is supported by MATRIX and AMSI.
To support post-symposium research collaboration between PhD student participants, MATRIX-AMSI are providing funding through the MATRIX-AMSI PhD Student Research Collaboration Scheme