I gave a talk about symmetric spaces and the tenfold way in Nicohl Furey’s series Algebra, Particles and Quantum Theory on Monday May 15, 2023. This talk was a followup to an earlier talk, also about the tenfold way.
This is a companion discussion topic for the original entry at https://johncarlosbaez.wordpress.com/2023/05/10/symmetric-spaces-and-the-tenfold-way/