  In this paper the inverse problem of determining the fractional orders in
mixed-type equations is considered. In one part of the domain the considered
equation is the subdiffusion equation with a fractional derivative in the sense
of Gerasimov-Caputo of the order 0<a<1 , and in the other part - a wave
equation with a fractional derivative of the order 1<b<2 . The elliptic part of
the equation is a second-order operator, considered in a N - dimensional domain
D. Assuming the parameters a and b to be unknown, additional conditions are
found that provide an unambiguous determination of the required parameters.
