Geodesic
Temporary deformations of degrees of the wave operator
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 34, Tome 324 (2005), pp. 213-228 Cet article a éte moissonné depuis la source Math-Net.Ru

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The conditions at which the linear differential operators of the second order are equivalent to operators not containing of “friction” (first partial derivatives) are investigated. One can construct iso-Huygens deformations for degrees of the wave operator with time-dependent coefficients. The fundamental solutions of these deformations and conditions, at which the Huygens principle holds are found. 
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     title = {Temporary deformations of degrees of the wave operator},
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S. P. Khekalo. Temporary deformations of degrees of the wave operator. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 34, Tome 324 (2005), pp. 213-228. http://geodesic.mathdoc.fr/item/ZNSL_2005_324_a12/

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