Applications of Automata Theory and Algebra: Via the Mathematical Theory of Complexity to Biology, Physics, Psychology, Philosophy, and Games by John L. Rhodes (2009) Paperback
At first read, I was uncertain if the author was crazy or a genius. After reading it a couple times, I think it's the latter, but the excitement of the author could be misconstrued for lunacy, or vice-versa.
One of the first (perhaps the only) book to discuss semigroups from the perspective of computation, and as a "theory of time" (in the sense that sequence of events/transformations is a "theory of time").
Discusses physics from this perspective, which is done in the "obvious way": the time-evolution of a system is the principal problem in physics, which is an obvious semigroup problem.
Likewise in biology, the cell has two "subsystems", namely some "metabolism" subsystem and a "genetic" subsystem. These are examples of computational processes, which are themselves semigroups.
The "field of algebraic engineering" has apparently been "emerging" for half a century. No results so far.
Mathematically, what's the great insight of semigroups over groups? The wreath product is like a normal group product plus time going forward. OK. And?
Cool pictures of the Crebbs cycle. I would rather read his biology chapter than a biology textbook's.
An exciting book I would show to young people to get them excited about theory. For mature adults, getting really hyper about applications of theory doesn't cut the mustard.