Journ. Équ. Dériv. Partielles, St.-Jean-De-Monts 1986, Conf. No.2, 7 p. (1986).
This paper is basically an announcement, with ideas of proofs, of a future article by the same writer.
It is concerned with weak solutions to a conservation law in a subset of . Basically, it is indicated that if the data are analytic in the neighbourhood of a discontinuity, then the solution may be uniquely continued analytically, and the solution is, in a sense, uniformly stable.