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Аннотация:A study of differential equations has shown that the integrability of mathematical physics equa-tions depends on the consistency of the derivati- ves of described functions and equations that form the equations of mathematical physics. Shown, that on the original coordinate space the differential equation turns out to be non-integrable. However, if there are any degrees of freedom, then integ-rable structures, on which the derivatives of a differential equation form a differential, are realized. That is, discrete functions are the solution to the equations of mathematical physics on integrable structures. This indicates to the differential equation integrability.