Study of properties of firmness of solutions of equations with partial derivatives by the method of separation of variables von Bugir, M. K., Бугир, М. К.

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Theorems on the average values and non-oscillating character of the solutions of the partial differential equations in the spaces $E^n$ and $P^n$ von Bugir, M.K., Бугир, М.К.

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Conditions of nonoscillation of binomial systems of differential equations von Bugir, M. K., Бугир, М. К., Бугир, М. К.

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