An introduction to compact symmetric multicategories and problematic loops (part 2)

Sophie Raynor – 6 March 2019

Following on from last time, I'll talk about Joyal-Kock's Feynman graphs in more detail and use them to build non-unital CSMs. A first attempt at constructing unital CSMs by enlarging the J-K graph category to include an extra object (the exceptional loop) works in some special cases, but doesn't lead to a general construction. (We'll get that another time by taking a quite different approach.)