“…Before doing this, we give a (necessarily incomplete) overview of some of the literature on the method of fundamental solutions, particularly with regard to density results and (rather scarce) convergence results. Based mainly on work by Smyrlis [262][263][264], we prove a density result for the method of fundamental solutions in poroelasticity developed from regularizing the corresponding boundary integral equations. To the best of our knowledge, density results for implicit evolution equations, systems of differential equations with a dependence on time, which are, thus, non-elliptic, or systems which cannot be easily decoupled into several separate equations have not been proven before.…”