Are you sure? I don't see such a book at https://mitpress.mit.edu/author/gerald-jay-sussman-2078/ https://mitpress.mit.edu/author/gerald-jay-sussman-2078/. I'd

Are you sure? I don't see such a book at https://mitpress.mit.edu/author/gerald-jay-sussman-2078/ https://mitpress.mit.edu/author/gerald-jay-sussman-2078/. I'd be very interested to read it if there is one. Functional Differential Geometry is about the maths required for field theories but focuses on relativity as the main example.