  The main point of this paper is to prove the following useful result: If the
almost everywhere 2-jet of a locally quasi-convex function u satisfies a
degenerate elliptic constraint F, then u is F-subharmonic, i.e., u is a
viscosity F-subsolution. This AE Theorem makes otherwise difficult results
transparent. Some instances of this are presented, including two versions of
addition, and a comparison theorem.
