#### John Baez

#### Mathematical Physics
Seminar, Friedrich-Alexander-Universität Erlangen-Nürnberg

#### February 5, 2014

## Categories in Control

Control theory is the branch of classical mechanics that deals with
'open systems': physical systems like machines, where the time
evolution depends on parameters that can be changed in a
time-dependent way by an external agent. We can take small open
systems and glue them together to form larger ones. This means that
category theory is relevant: we can treat open systems as 'morphisms',
and glue them together by composing or tensoring them. Here we
describe some small steps toward a category-theoretic approach to
control theory.

You can see the slides here. For
related material including a video of a talk I gave on control theory,
try:

© 2014 John Baez

baez@math.removethis.ucr.andthis.edu