Stability of mixed FEMs for non-selfadjoint indefinite second-order linear elliptic PDEs

C. Carstensen, Neela Nataraj, Amiya K. Pani

For a well-posed non-selfadjoint indefinite second-order linear elliptic PDE with general coefficients $\mathbf{A},\mathbf{b},\gamma$ in $L^{\infty }$ and symmetric and uniformly positive d…