1·î13Æü(ÌÚ)  15:30 -- 17:00 Sergey I. Kabanikhin
                            (Sobolev Institute of Mathematics, Russia)
             ``Discrete and continuous Gelfand-Levitan method in 
               multidimensional inverse problems''
       
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The multidimensional analog of Gelfand-Levitan method of solving inverse
problems for hyperbolic equations is considered. The discrete analog of 
multidimensional hyperbolic inverse problem is the nonlinear system of 
algebraic equations. This system is proved to be equivalent to the properly 
chosen system of linear algebraic equations. Applications to siesmic and 
acoustic inverse problems are discussed.