Geodesic
On degenerate multidimensional dispersion laws
Teoretičeskaâ i matematičeskaâ fizika, Tome 112 (1997) no. 1, pp. 124-131

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We study degeneration of multidimensional analytic at the vicinity dispersion laws given that the corresponding function of degeneracy satisfies condition (3). We prove that two-dimensional dispersion laws $\omega(p,q)$ can be degenerate with respect to the decay process $1\to2$ if and only if their asymptotic behaviour when $p$ and $q$ are small has the form (28). It is shown that the corresponding function of degeneracy is unique and its asymptotic behaviour is found. 
@article{TMF_1997_112_1_a8,
     author = {D. D. Tskhakaya and E. I. Shulman},
     title = {On degenerate multidimensional dispersion laws},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {124--131},
     publisher = {mathdoc},
     volume = {112},
     number = {1},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1997_112_1_a8/}
}
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D. D. Tskhakaya; E. I. Shulman. On degenerate multidimensional dispersion laws. Teoretičeskaâ i matematičeskaâ fizika, Tome 112 (1997) no. 1, pp. 124-131. http://geodesic.mathdoc.fr/item/TMF_1997_112_1_a8/