Differential equations are fundamental tools in physics: they are used to describe phenomena ranging from fluid dynamics to general relativity. But when these equations become stiff (i.e. they involve ...

The problem of finding an energy conserving norm for the solution of the hyperbolic system of partial differential equations $\partial u/\partial t = A\partial u/\partial x$, subject to boundary ...

This paper is motivated by the observation that solutions to certain variational inequalities involving partial differential operators of the form $\operatorname{div} A(x, u, \nabla u) + B(x, u, ...