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Computation of Green’s matrices for boundary value problems associated with a pair of mixed linear regular ordinary differential operators. (English) Zbl 0835.34024
A pair of mixed linear regular ordinary differential operators of the type $$\tau_1u_1 = \sum^n_{k = 0}P_k D^ku_1 = \lambda u_1$$, defined on the interval $$J_1 = [a,b]$$ and $$\tau_2u_2 = \sum^m_{k = 0} Q_kD^ku_2 = \lambda u_2$$ defined on the adjacent interval $$J_2 = [b,c]$$, where $$\lambda$$ is an unknown constant (eigenvalue) and the functions $$u_1$$ and $$u_2$$ satisfy certain mixed conditions at the interface $$x = b$$, is studied. Algorithms are presented for the computation of Green’s matrices for the boundary value problems associated with $$(\tau_1, \tau_2)$$. The developed algorithms are used in two physical examples, i.e. in the computation of Green’s matrices encountered in the studies of acoustic waveguides in oceans (ocean surface-bottom) and in the studies of transversal vibrations in nonhomogeneous strings.
Reviewer: V.Burjan (Praha)

##### MSC:
 34B05 Linear boundary value problems for ordinary differential equations 34B27 Green’s functions for ordinary differential equations 74K05 Strings 76B15 Water waves, gravity waves; dispersion and scattering, nonlinear interaction
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