Schrödinger equation, the neutron transport equation, Maxwell's equations, and the Dirac equation. A notable feature of the book is the treatment of second-order elliptic and parabolic problems in L and L spaces. Fattorini does a nice job of explaining the Agmon-Douglis-Nirenberg elliptic machinery (in the second-order case), making it accessible to a wide audience. An important feature of the ...