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\title{Inverse scattering for a small nonselfadjoint
perturbation of the wave equation}
\author{Kiyoshi MOCHIZUKI\\
Department of Mathematics, Tokyo Metropolitan University\\
Hachioji, Tokyo 192-0397, Japan}
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\begin{document}
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\maketitle
We consider the wave equation of the form
$$
w_{tt}+b(x)w_{t}-\Delta w = 0, \quad  (x,t)\in {\bf R}^{n}\times{\bf R}
$$
where $n\geq 3$ and $b(x)$ is a complex valued "small" function which 
decays sufficiently fast at infinity. In this talk we discuss the following 
three problems for this equation:\par
1) \ To show the existence of the scattering operator,\par
2) \ To obtain the expression of the scattering amplitude,\par
2) \ To develop a reconstruction procedure of $b(x)$ from the scattering 
amplitude.

\end{document}

