Vol. 20 No. 1 (2023): Том 20, №1, 2023

Mathematical logic, algebra and number theory

Undecidability of the submonoid membership problem for a sufficiently large finite direct power of the Heisenberg group

Vitalii Roman'kov
The complexity of quasivariety lattices. II

Marina Vladimirovna Schwidefsky
Distance-regular graph with intersection array {143,108,27;1,12,117} does not exist

Никита Сергеевич Новиков
Инвариантные солитоны Риччи на трёхмерных неунимодулярных группах Ли с левоинвариантной Лоренцевой метрикой и полусимметрической связностью

Никита Сергеевич Новиков
On two intervals in the lattice of partial ultraclones of rank 2

Иван Шаранхаев
Limited combinatorial-selector sets

Dmitry Ivanov, Olga Ivanova
Quasivarieties generated by small suborder lattices. I. Equational bases

Olga, Marina Vladimirovna Schwidefsky
Generic polynomial algorithms for the knapsack problem in some matrix semigroups

Александр Рыбалов
A note on joins and meets for positive linear preorders

Николай Алексеевич Баженов
НЕПРИВОДИМЫЕ КОВРЫ ЛИЕВА ТИПА Bl, Cl И F4 НАД ПОЛЯМИ IRREDUCIBLE CARPETS OF TYPE LIE Bl, Cl, AND F4 OVER THE FIELDS

Яков Нифантьевич Нужин
Almost $n$-ary and almost $n$-aritizable theories

Сергей Владимирович Судоплатов

Computational mathematics

Numerical Statistical Simulation of Optical Radiation Transfer process in Random Crystal Media

Boris Kargin, Quan Mu, Evgeniya Kablukova
Fluid flow simulation in a T-connection of square pipes using modern approaches to turbulence modeling

Andrey Kurkin

Discrete mathematics and mathematical cybernetics

On reduction for eigenfunctions of graphs

Alexandr Valyuzhenich
On the preservation of the Wiener index of cubic graphs upon vertex removal On the preservation of the Wiener index of cubic graphs

andrey Dobrynin

Differential equations, dynamical systems and optimal control

GRADIENT FLOW FOR KOHN-VOGELIUS FUNCTIONAL

Павел Плотников
Iterative solution of the retrospective inverse heat conduction problem by the Poisson integral

Anatoly Kardashevsky
Пространственно-нелокальные краевые задачи с обобщенным условием Самарского-Ионкина для квазипараболических уравнений

Александр Иванович Кожанов

Real, complex and functional analysis

On the dissymmetrization theorem

Владимир Николаевич Дубинин
Uniform convergence on subspaces in von Neumann's ergodic theorem with continuous time

Иван Викторович Подвигин, Alexander Kachurovskii, Владислав Тодиков

Geometry and Topology

Letter to the Editor

Сергей Агапов
The volume of a trirectangular hyperbolic tetrahedron

Николай Владимирович, Stepan Stepanishchev
Lagrange spaces with changed Z. Shen square metric

Никита Сергеевич Новиков

Probability theory and mathematical statistics

Critical multitype branching processes on a graph and the model of the HIV infection development

Никита Сергеевич Новиков
Remarks on the ladder values of a random walk with stable jump distributions

Vladimir Lotov

Mathematical logic, algebra and number theory

Undecidability of the submonoid membership problem for a sufficiently large finite direct power of the Heisenberg group

The complexity of quasivariety lattices. II

Distance-regular graph with intersection array {143,108,27;1,12,117} does not exist

Инвариантные солитоны Риччи на трёхмерных неунимодулярных группах Ли с левоинвариантной Лоренцевой метрикой и полусимметрической связностью

On two intervals in the lattice of partial ultraclones of rank 2

Limited combinatorial-selector sets

Quasivarieties generated by small suborder lattices. I. Equational bases

Generic polynomial algorithms for the knapsack problem in some matrix semigroups

A note on joins and meets for positive linear preorders

НЕПРИВОДИМЫЕ КОВРЫ ЛИЕВА ТИПА Bl, Cl И F4 НАД ПОЛЯМИ IRREDUCIBLE CARPETS OF TYPE LIE Bl, Cl, AND F4 OVER THE FIELDS

Almost $n$-ary and almost $n$-aritizable theories

Computational mathematics

Numerical Statistical Simulation of Optical Radiation Transfer process in Random Crystal Media

Fluid flow simulation in a T-connection of square pipes using modern approaches to turbulence modeling

Discrete mathematics and mathematical cybernetics

On reduction for eigenfunctions of graphs

On the preservation of the Wiener index of cubic graphs upon vertex removal On the preservation of the Wiener index of cubic graphs

Differential equations, dynamical systems and optimal control

GRADIENT FLOW FOR KOHN-VOGELIUS FUNCTIONAL

Iterative solution of the retrospective inverse heat conduction problem by the Poisson integral

Пространственно-нелокальные краевые задачи с обобщенным условием Самарского-Ионкина для квазипараболических уравнений

Real, complex and functional analysis

On the dissymmetrization theorem

Uniform convergence on subspaces in von Neumann's ergodic theorem with continuous time

Geometry and Topology

Letter to the Editor

The volume of a trirectangular hyperbolic tetrahedron

Lagrange spaces with changed Z. Shen square metric

Probability theory and mathematical statistics

Critical multitype branching processes on a graph and the model of the HIV infection development

Remarks on the ladder values of a random walk with stable jump distributions

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