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Название: Partial Differential Equations III: The Cauchy Problem. Qualitative Theory of Partial Differential Equations
Авторы: Egorov Y.V., Shubin M.A.
In mathematics, a partial differential equation (PDE) is a differential equation that contains unknown multivariable functions and their partial derivatives. (This is in contrast to ordinary differential equations, which deal with functions of a single variable and their derivatives.) PDEs are used to formulate problems involving functions of several variables, and are either solved by hand, or used to create a relevant computer model.