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The scattering matrix for nonlocal field interactionsThe covariant, unitary and causal S-matrix for nonlocal relativistic quantum field theories

Unitary transform and subadditivity condition for composite and noncomposite systems an analogous density matrix for the single-qudit state of a four-level atom. We perform the global unitary

On hermitian operators X and Y meeting the condition -Y ≤ X ≤ Ymatrix

Estimating the Norm of Solution of Singularly Perturbed Quasilinear Problems for ODE Systems with Nonlinear Normal Matrices on the SemiaxisUsing the method of unitary transformation, the singularly perturbed quasi-linear systems

Construction of the scattering matrix in the quantum theory of interacting fields-products) which define a relativistically covariant, unitary, and causal scattering matrix for locally

Study of Non-Autonomous Equations in the Theory of Gyroscopes solid-state described by the system of ODE of the fourth order with normal matrix.

Relativistically covariant chronological ordering of interaction lagrangians for these functions, which guarantees that the scattering matrix is unitary, covariant, and causal. The explicit form

Superconductivity of twisted double bi-layer graphene in chiral model parameter the unitary SU(2) - matrix U with the kink-like (or domain wall) structure for the description

Application of Matrix Decompositions for Matrix Canonization, singular, or ill conditioned SLAEs using matrix canonization is considered. A modification of an existing

On a method for studying the norm and the stability of solutionsWe present a new method (the method of unitary transformations), which differs from the existing

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