On Systems of Linear Ordinary Differential Equations
On Systems of Linear Ordinary Differential Equations
Herbert Bishop Keller
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N-k -13- The scattering matrix S is defined "by 33) 1 ' ' FroBi the last two equations we obtain 3^^) S(^, z^; n-k provided that 35) -^-^Vk. N-k^^ • The scattering matrix S given "by eq, . (3I+) yields the amplitudes of the scattered waves at ^ emd z in terms of the amplitudes of the incident waves at the same points, when the phases of the wpves at f and z are referred to z-^ and Zq respectively. Its definition is independent of the presence or ahsence of turning points. In most cases of inter...est S approaches a limit as ^ end z approach plus and minus infinity respectively, and this limit is v/hat is usually called the scattering matrix. It depends only upon the reference points z, and -llt- VI, Asymptotic Expansion of the Solution . If the matrix A(z) depends upon a parameter k in an appropriate way, then the Bolution of equations (l) posseBses an asymptotic expansion in reciprocal powers of k in regions where the latent roots of A are distinct. This result was o'btained by Birklioff [s J for an nth order equation and has since heen ex- tended to nth order systems.
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