Inverse problems in the theory of small oscillations

Matrices > Oscillations > Frequencies of oscillating systems > Mechanics of particles and systems -- Dynamics of a system of particles, including celestial mechanics -- Inverse problems > Numerical analysis -- Partial differential equations, boundary value problems -- Inverse problems > Partial differential equations -- Spectral theory and eigenvalue problems -- Scattering theory > Partial differential equations -- Equations of mathematical physics and other areas of application -- PDEs in connection with mechanics of particles and systems > Numerical analysis -- Integral equations, integral transforms -- Inverse problems