Cauchy problem for a parabolic–hyperbolic equation with non-characteristic line of type changing–hyperbolic-type
equation. Also, for this
equation, we investigate a Cauchy-type problem with a line of changing type
Variational principles for some differential difference operator difference
equations and to construct of the functional, if the given operator is a potential on a given set
Analysis of functional-differential equation with orthotropic contractions equations that associate boundary points with inner points. This nonlocal effect leads to the appearance