A posteriori $L^{\infty }(L^2)$-error bounds in finite element approximation of the wave equation

Emmanuil H. Georgoulis, Omar Lakkis, Charalambos Makridakis

We address the error control of Galerkin discretization (in space) of linear second order hyperbolic problems. More specifically, we derive a posteriori error bounds in the L\infty…