# Search results

Journal of Mathematical Sciences > 2019 > 242 > 5 > 642-650

**x**_{n},

*n*= 1, . . .,

*N*, is a symmetric operator with deficiency indices (3N, 3N). The calculation of the scalar products of its regular analytic vectors is the key step in the construction of the resolvents of its self-adjoint extensions via Krein’s...

Journal of Mathematical Sciences > 2019 > 242 > 5 > 608-627

Journal of Mathematical Sciences > 2019 > 242 > 5 > 683-691

Journal of Mathematical Sciences > 2019 > 242 > 5 > 628-635

*XY*Heisenberg spin 1 2 $$ \frac{1}{2} $$ chain in the fermion representation. The construction of the ground-state vector is based on the group-theoretical approach. An exact expression for the ground-state vector will allow one to study the combinatorics of the correlation functions of the model.

Journal of Mathematical Sciences > 2019 > 242 > 5 > 587-594

Journal of Mathematical Sciences > 2019 > 242 > 5 > 692-700

*SL*(2

*,*ℝ), the tensor product of two continuous series representations can be decomposed into a direct sum of representations corresponding to the discrete and continuous spectra. The general theory implies the completeness of the system of projections that realize this decomposition. The main purpose of this paper is to check the corresponding relation in...

Journal of Mathematical Sciences > 2019 > 242 > 5 > 715-721

Journal of Mathematical Sciences > 2019 > 242 > 5 > 742-752

Journal of Mathematical Sciences > 2019 > 242 > 5 > 595-607

Journal of Mathematical Sciences > 2019 > 242 > 5 > 651-657

*C*

_{2}and

*G*

_{2}.

Measurement Techniques > 2019 > 62 > 4 > 299-299

Journal of Mathematical Sciences > 2019 > 242 > 5 > 636-641

Journal of Mathematical Sciences > 2019 > 242 > 5 > 658-682

Journal of Mathematical Sciences > 2019 > 242 > 5 > 722-741

Journal of Mathematical Sciences > 2019 > 242 > 5 > 701-714

Fibre Chemistry > 2019 > 51 > 1 > 73-75

Fibre Chemistry > 2019 > 51 > 1 > 26-31

Fibre Chemistry > 2019 > 51 > 1 > 9-13

Fibre Chemistry > 2019 > 51 > 1 > 64-67

Fibre Chemistry > 2019 > 51 > 1 > 38-40

^{2}) nonwoven materials requiring improved hydrophilic properties are used to manufacture hygiene products. Experimental investigations are made of the process of ultrasonic impregnation with an additive and of drying in a field of ultrahigh-frequency currents, of thermoplastic polymeric hygienic nonwoven materials obtained by direct molding. The investigations demonstrated...