H. Frankowska et S. Plaskacz, Semicontinuous solutions of Hamilton-Jacobi-Bellman equations with degenerate state constraints, J MATH ANAL, 251(2), 2000, pp. 818-838
In this paper, the value function of a Bolza optimal control problem with s
tate constraints is characterized as the unique lower semicontinuous soluti
on of a Hamilton-Jacobi equation. The state constraints are given by an arb
itrary closed set with possibly empty interior. In particular, Soner's inwa
rd pointing condition is extended here to the case of degenerate state cons
traints. (C) 2000 Academic Press.