Geodesic
On the zeros of solutions of a linear analytic partial differential equation of arbitrary order
Sbornik. Mathematics, Tome 37 (1980) no. 3, pp. 403-410 Cet article a éte moissonné depuis la source Math-Net.Ru

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This paper considers the question of the decay in a neighborhood of a zero on the boundary of a solution of a linear differential equation of any order with principal part consisting of an operator elliptic in the space variables. The coefficients of the equation are assumed to be analytic. An estimate is obtained of the solution of the Cauchy problem with data on a timelike surface in which the dependence on the dimensions of the support of the data is explicitly exhibited. The question of the admissible zeros on the boundary of the domain of definition is solved on the basis of the estimate obtained. Bibliography: 7 titles. 
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     title = {On the zeros of solutions of a~linear analytic partial differential equation of arbitrary order},
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V. I. Ruderfer. On the zeros of solutions of a linear analytic partial differential equation of arbitrary order. Sbornik. Mathematics, Tome 37 (1980) no. 3, pp. 403-410. http://geodesic.mathdoc.fr/item/SM_1980_37_3_a7/

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