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The generalization of the Mermin-Wagner theorem and the possibility of long-range order in the isotropic discrete one-dimensional quantum Heisenberg modelThe problem of existence of long-range order in the isotropic quantum Heisenberg model on the D=1

Regular zeros of quadratic maps and their applicationSufficient conditions for the existence of regular zeros of quadratic maps are obtained

Kantorovich’s Fixed Point Theorem in Metric Spaces and Coincidence PointsExistence and uniqueness theorems are obtained for a fixed point of a mapping from a complete

On the existence of solutions to geometrically nonlinear problems for shallow Timoshenko-type shells with free edgesOn the existence of solutions to geometrically nonlinear problems for shallow Timoshenko

On a functional differential equation© 2017, Pleiades Publishing, Ltd.Conditions for the existence and uniqueness of a solution to a

On the equilibrium problem of a soft network shell in the presence of several point loads results from the theory of monotone operatorsfor the proof of the existence theorem. It is proved

Impulsive control problems without the frobenius condition as earlier. Namely, the existence theorem is established, Cauchy-like conditions for well

General nonlinear impulsive control problems of generalized impulsive control. A generalized Filippov-like existence theorem for a solution is proved

A boundary value problem for Poisson's two-media equation in L-p(2)-spaces seminorm, where [GRAPHICS] It is proved that the solution exists for all f(x) is an element of L-p, and a

Existence theorems for optimal control in some problems of trajectories bundles control particles. In the paper, some sufficient conditions for existence of optimal control in some problems

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