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\centerline{\large \bf Computation of Multi-valued Solutions}

\centerline{\large \bf for Hyperbolic Conservation Laws}

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\centerline{Shi Jin}
\centerline{\it University of Wisconsin, Madison, U.S.A.}
\centerline{e-mail jin@math.wisc.edu}

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%   Text of the abstract
 Multi-valued solutions to hyperbolic conservation laws become
physically relavant when the physical regularization is dispersive.
Such problems arise when one considers the geometric optics or
semiclassical limits of Schrodinger equations, wave equations and
other integrable systems.  We will study analytic and numerical issues
for such problems, using the Wigner distribution.
                 
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