Approximation of solutions of SDE's with oblique reflection on an orthant

We consider the discrete penalization scheme, the projection and the Euler-Peano scheme for SDE’s driven by general semimartingale on an orthant with oblique reflection. We prove that these schemes converge in probability to the solution of the SDE in various topologies provided that the oblique reflection satisfies theassumption introduced by Harrison and Reiman. In the case where the driving semimartingale is an Itô process, the rate of Lp-convergence is discussed in detail.