• Eliana Lorch and Joshua Tan, The behavioral approach to systems theory, 15 June 2018.

Eliana Lorch is a mathematician based in San Francisco. Joshua Tan is a grad student in computer science at the University of Oxford and one of the organizers of Applied Category Theory 2018.

They wrote a great summary of this paper, which has been an inspiration to me and many others:

• Jan Willems, The behavioral approach to open and interconnected systems, *IEEE Control Systems* **27** (2007), 46–99.

• Maru Sarazola, Dynamical systems and their steady states, 2 April 2018.

She compares two papers:

• David Spivak, The steady states of coupled dynamical systems compose according to matrix arithmetic.

• John Baez and Blake Pollard, A compositional framework for reaction networks, *Reviews in Mathematical Physics* **29** (2017), 1750028.

(Blog article here.)

• Tai-Danae Bradley and Brad Theilman, Cognition, convexity and category theory, The *n*-Category Café, 10 March 2018.

My team, from left to right here, consisted of Blake Pollard working on power grids at NIST, Maru Saruzola doing algebraic K-theory at Cornell, Fabrizio Genovese working in Bob Coecke’s quantum group in computer science at Oxford, and Jonathan Lorand doing symplectic geometry in a postdoc in Zurich:

We discovered some surprising results about the math of ATP coupling, and now we need to write them up.

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