The FD= and FDHESSIAN= options specify the use of finite difference approximations of the derivatives. The FD= option specifies that all derivatives are approximated using function evaluations, and ...

While there is now an extensive literature on the approximation of the eigenvalue problem for compact operators, these theories do not include the classical finite-difference approximation. In the ...

The convergence rate is investigated for the solutions to difference schemes approximating the mixed initial boundary value problem for general systems of differential equations. It is shown that if ...