$$
$$
In an earlier post, we showed how to construct epidemiological models, including part of the COEXIST model of COVID-19, by composing structured cospans of Petri nets. We have since talked about this project at the UCR Categories Seminar. The slides are now online and the video is below:
This is a companion discussion topic for the original entry at https://blog.algebraicjulia.org/post/2020/11/structured-cospans-2/index.html