Concurrent Process Histories and Resource Transducers

We identify the algebraic structure of the material histories generated by concurrent processes. Specifically, we extend existing categorical theories of resource convertibility to capture concurrent interaction. Our formalism admits an intuitive graphical presentation via string diagrams for proarrow equipments. We also consider certain induced categories of resource transducers, which are of independent interest due to their unusual structure.Comment: 22 pages. Many Figures. Extended version of https://link.springer.com/chapter/10.1007%2F978-3-030-78142-2_1