### Oleinik Type Estimates and Uniqueness for n x n Conservation Laws

A. Bressan and P. Goatin

Abstract: Let $u_t + f(x)_x =0$ be a strictly hyperbolic $n\times n$ system of conservation laws in one space dimension. Relying on the existence of a semigroup of solutions, we first establish the uniqueness of entropy admissible weak solutions to the Cauchy problem, under a mild assumption on the local oscillation of $u$ in a forward neighborhood of each point in the $t-x$ plane. In turn, this yields the uniqueness of weak solutions which satisfy a decay estimate on positive waves of genuinely nonlinear families, thus extending a classical result proved by Oleinik in the scalar case.

Paper:
Available as PostScript
Title:
Oleinik type estimates and uniqueness for n x n conservation laws
Author(s):
A. Bressan, <bressan@sissa.it>
P. Goatin, <goatin@sissa.it>
Publishing information:
To appear in J. Diff. Eq.