Geodesic
Multidimensional Ultrametric Pseudodifferential Equations
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Selected topics of mathematical physics and $p$-adic analysis, Tome 265 (2009), pp. 19-35

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We develop an analysis of wavelets and pseudodifferential operators on multidimensional ultrametric spaces which are defined as products of locally compact ultrametric spaces. We introduce bases of wavelets, spaces of generalized functions and the space $D'_0(X)$ of generalized functions on a multidimensional ultrametric space. We also consider some family of pseudodifferential operators on multidimensional ultrametric spaces. The notions of Cauchy problem for ultrametric pseudodifferential equations and of ultrametric characteristics are introduced. We prove an existence theorem and describe all solutions for the Cauchy problem (an analog of the Kovalevskaya theorem). 
@article{TM_2009_265_a1,
     author = {S. Albeverio and S. V. Kozyrev},
     title = {Multidimensional {Ultrametric} {Pseudodifferential} {Equations}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {19--35},
     publisher = {mathdoc},
     volume = {265},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM_2009_265_a1/}
}
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S. Albeverio; S. V. Kozyrev. Multidimensional Ultrametric Pseudodifferential Equations. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Selected topics of mathematical physics and $p$-adic analysis, Tome 265 (2009), pp. 19-35. http://geodesic.mathdoc.fr/item/TM_2009_265_a1/