Well-posedness of the martingale problem for some degenerate diffusion processes occurring in dynamics of populations

In this paper we establish the well-posedness in C(0,∞);0,1]^d), for each starting point x∈0,1]d, of the martingale problem associated with a class of degenerate elliptic operators which arise from the dynamics of populations as a generalization of the Fleming-Viot operator. In particular, we prove that such degenerate elliptic operators are closable in the space of continuous functions on 0,1]^d and their closure is the generator of a strongly continuous semigroup of contractions.