The Lazy Universe:
an introduction to the Principle of Least Action
The Principle of Least Action is the ‘Harrison’s Chronometer’ of physics: whatever the scenario and whatever the reference frame (a bit like wind direction or choppy seas), the Principle is the beacon that illuminates what’s really going on.
Oxford University Press 2017
“a beautiful exposition” Gerald Jay Sussman, Panasonic Professor of Electronic Engineering MIT
Energy, the Subtle Concept:
paperback edition, Oxford University Press, 2015
How energy came into physics, and an explanation of what energy is.