\documentstyle{SibMatJ} \issueyear{2021} \issuenumber{1} \pagenomo \toc \title\bf A.N.~Abyzov and D.T.~Tapkin\unskip\rm,\quad \it Rings over Which Matrices Are Sums of Idempotent and $q$-Potent Matrices \page{1}\rpage{3} \endtitle \title\bf V.V.~Aseev\unskip\rm,\quad \it Multivalued Quasim\"obius Mappings from Circle to Circle \page{14}\rpage{19} \endtitle \title\bf N.A.~Bazhenov, M.~Mustafa, and S.S.~Ospichev \unskip\rm,\quad \it On~Universal Pairs in the Ershov Hierarchy \page{23}\rpage{31} \endtitle \title\bf S.S.~Volosivets\unskip\rm,\quad \it Ulyanov-Type Embedding Theorems for Functions on Zero-Dimensional Locally Compact Groups \page{32}\rpage{42} \endtitle \title\bf K.A.~Ilenko and N.V.~Maslova\unskip\rm,\quad \it On the Coincidence of the Classes of Finite Groups~$E_{\pi _x}$ and~$D_{\pi _x}$ \page{44}\rpage{55} \endtitle \title\bf B.Sh.~Kulpeshov and T.S.~Mustafin\unskip\rm,\quad \it Almost $\omega $-Categorical Weakly $o$-Minimal Theories of Convexity Rank~1 \page{52}\rpage{65} \endtitle \title\bf E.V.~Lipacheva\unskip\rm,\quad \it Extensions of Semigroups and Morphisms of Semigroup $C^*$-Algebras \page{66}\rpage{82} \endtitle \title\bf D.V.~Lytkina and V.D.~Mazurov\unskip\rm,\quad \it On Characterization of Simple Orthogonal Groups of Odd Dimension in the Class of Periodic Groups \page{77}\rpage{97} \endtitle \title\bf V.V.~Malygina and A.S.~Balandin\unskip\rm,\quad \it Asymptotic Stability for a~Class of Equations of Neutral Type \page{84}\rpage{106} \endtitle \title\bf A.S.~Mamontov and E.~Jabara\unskip\rm,\quad \it Recognizing~$A_7$ by Its Set of Element Orders \page{93}\rpage{117} \endtitle \title\bf Y.~Mao, X.~Ma, and W.~Guo\unskip\rm,\quad \it A~New Characterization of Finite $\sigma $-Soluble $P\sigma T$-Groups \page{105}\rpage{131} \endtitle \title\bf S.~Meshaik and T.~Oner\unskip\rm,\quad \it The Maximal Cardinality of the Base in~$P_{2}\times P_{2}$ \page{114}\rpage{144} \endtitle \title\bf V.~H.~Mikaelian\unskip\rm,\quad \it Embeddings Determined by Universal Words in the Rank~2 Free Group \page{123}\rpage{154} \endtitle \title\bf A.V.~Osipov and E.G.~Pytkeev\unskip\rm,\quad \it Solution of Ponomarev's Problem of Condensation onto Compact Sets \page{131}\rpage{164} \endtitle \title\bf A.P.~Pozhidaev and I.P.~Shestakov\unskip\rm,\quad \it On the Right-Symmetric Algebras with a~Unital Matrix Subalgebra \page{138--147}\rpage{173} \endtitle \title\bf A.V.~Popov\unskip\rm,\quad \it Nilpotency of Alternative and Jordan Algebras \page{148}\rpage{185} \endtitle \title\bf Kh.~G.~Umarov\unskip\rm,\quad \it The Cauchy Problem for the Nonlinear Long Longitudinal Waves Equation in a~Viscoelastic Rod \page{159}\rpage{198} \endtitle \title\bf J.~Huang, B.~Hu, and A.N.~Skiba\unskip\rm,\quad \it Finite Groups with Weakly Subnormal and Partially Subnormal Subgroups \page{169}\rpage{210} \endtitle \title\bf J.~Zhang, Zh.~Gao, and L.~Miao\unskip\rm,\quad \it Some Notes on the Second Maximal Subgroups of Finite Groups \page{178}\rpage{221} \endtitle \title\bf A.A.~Shlepkin\unskip\rm,\quad \it Locally Finite Groups with Prescribed Structure of Finite Subgroups \page{182}\rpage{226} \endtitle \endtoc \vskip2cm \begingroup\leftskip=1in\rightskip=1in\tenpoint\noindent {\it Siberian Mathematical Journal\/} is abstracted or indexed in ANVUR, CNKI, Dimensions, EBSCO Academic Search, EBSCO Advanced Placement Source, EBSCO Discovery Service, EBSCO STM Source, Google Scholar, Institute of Scientific and Technical Information of China, Japan\-ese Science and Technology Agency (JST), Journal Citation Reports/Science Edition Mathematical Reviews, Naver OCLC WorldCat Discovery Service, ProQuest Central, ProQuest Engineering, ProQuest Materials Science and Engineering Database, ProQuest SciTech Premium Collection, ProQuest Technology Collection, Pro\-Quest-ExLibris Primo, ProQuest-ExLibris Summon, SCImago, SCOPUS, Science Citation Index Expanded (SciSearch), TD Net Discovery Service, UGC-CARE List (India), zbMATH. \par\endgroup \begingroup\enddocument \documentstyle{SibMatJ} \issueyear{2021} \issuenumber{2} \pagenomo \toc \title\bf S.V.~Astashkin \unskip\rm,\quad \it Sequences of~Independent Functions in Rearrangement Invariant Spaces \page{189}\rpage{239} \endtitle \title\bf O.V.~Borodin and A.O.~Ivanova\unskip\rm,\quad \it Heights of Minor Faces in 3-Polytopes \page{199}\rpage{250} \endtitle \title\bf D.K.~Durdiev and Zh.~D.~Totieva\unskip\rm,\quad \it About Global Solvability of a~Multidimensional Inverse Problem for an Equation with Memory \page{215}\rpage{269} \endtitle \title\bf S.F.~Kamornikov, V.N.~Tyutyanov, and O.L.~Shemetkova\unskip\rm,\quad \it On $\sigma $-Subnormality of~Sylow Subgroups in~a~Finite Group \page{230}\rpage{286} \endtitle \title\bf M.B.~Karmanova\unskip\rm,\quad \it The Coarea Formula for Vector Functions on Carnot Groups with Sub-Lorentzian Structure \page{239}\rpage{298} \endtitle \title\bf V.A.~Koibaev\unskip\rm,\quad \it Closed Elementary Nets over a~Field of Characteristic~0 \page{262}\rpage{326} \endtitle \title\bf V.B.~Korotkov\unskip\rm,\quad \it On Almost Compactness of Some Partially Integral Operators in~$L_{p}$ \page{267}\rpage{333} \endtitle \title\bf S.A.~Nazarov and L.~Chesnel\unskip\rm,\quad \it Almost Complete Transmission of Waves Through Perforated Cross-Walls in a~Waveguide with Dirichlet Boundary Condition \page{272}\rpage{339} \endtitle \title\bf P.G.~Potseiko and E.A.~Rovba\unskip\rm,\quad \it Approximations on Classes of Poisson Integrals by Fourier--Chebyshev Rational Integral Operators \page{292}\rpage{362} \endtitle \title\bf D.O.~Revin \unskip\rm,\quad \it Submaximal Soluble Subgroups of Odd Index in Alternating Groups \page{313}\rpage{387} \endtitle \title\bf M.A. Skvortsova and T. Yskak\unskip\rm,\quad \it Asymptotic Behavior of Solutions in One Predator--Prey Model with Delay \page{324}\rpage{402} \endtitle \title\bf V.N.~Starovoitov\unskip\rm,\quad \it Unique Solvability of a~Linear Parabolic Problem with Nonlocal Time Data \page{337}\rpage{417} \endtitle \title\bf A.M.~Staroletov\unskip\rm,\quad \it Composition Factors of the Finite Groups Isospectral to Simple Classical Groups \page{341}\rpage{422} \endtitle \title\bf A.A.~Stepanova and A.I.~Krasitskaya\unskip\rm,\quad \it $P$-Stability of Some Classes of~$S$-Acts \page{357}\rpage{441} \endtitle \title\bf F.~Sun, X.~Yi, and S.F.~Kamornikov \unskip\rm,\quad \it Finite Groups with~Generalized Subnormal Schmidt Subgroups \page{364}\rpage{450} \endtitle \title\bf N.A.~Tyurin\unskip\rm,\quad \it Examples of Mironov Cycles in Grassmannians \page{370}\rpage{457} \endtitle \title\bf N.~Yang and A.A.~Galt\unskip\rm,\quad \it On the Local Case in the Aschbacher Theorem for Symplectic and Orthogonal Groups \page{377}\rpage{466} \endtitle \endtoc \vskip2cm \begingroup\leftskip=1in\rightskip=1in\tenpoint\noindent {\it Siberian Mathematical Journal\/} is abstracted or indexed in ANVUR, CNKI, Dimensions, EBSCO Academic Search, EBSCO Advanced Placement Source, EBSCO Discovery Service, EBSCO STM Source, Google Scholar, Institute of Scientific and Technical Information of China, Japan\-ese Science and Technology Agency (JST), Journal Citation Reports/Science Edition Mathematical Reviews, Naver OCLC WorldCat Discovery Service, ProQuest Central, ProQuest Engineering, ProQuest Materials Science and Engineering Database, ProQuest SciTech Premium Collection, ProQuest Technology Collection, Pro\-Quest-ExLibris Primo, ProQuest-ExLibris Summon, SCImago, SCOPUS, Science Citation Index Expanded (SciSearch), TD Net Discovery Service, UGC-CARE List (India), zbMATH. \par\endgroup \begingroup\enddocument \documentstyle{SibMatJ} \issueyear{2021} \issuenumber{3} \pagenomo \toc \title\bf V.N.~Berestovskii and I.A.~Zubareva\unskip\rm,\quad \it Abnormal Extremals of Left-Invariant Sub-Finsler Quasimetrics on Four-Dimensional Lie Groups \page{383}\rpage{481} \endtitle \title\bf O.V.~Borodin and A.O.~Ivanova\unskip\rm,\quad \it A~Tight Description of 3-Polytopes by Their Major 3-Paths \page{400}\rpage{502} \endtitle \title\bf A.~Dubickas\unskip\rm,\quad \it Cyclotomic Quotients of Two~Conjugates of an Algebraic Number \page{409}\rpage{513} \endtitle \title\bf F.A.~Dudkin and E.A.~Shaporina\unskip\rm,\quad \it Automorphisms of the Gersten Group \page{413}\rpage{518} \endtitle \title\bf B.A.~Kats, D.~B.~Katz, and Zhixin Lyu\unskip\rm,\quad \it The Riemann Boundary Value Problem on Circular Spirals \page{423}\rpage{529} \endtitle \title\bf S.B. Klimentov\unskip\rm,\quad \it Second Kind Representations of Sobolev Space Solutions to a~First Order General Elliptic Linear System in a~Simply Connected Plane Domain \page{434}\rpage{542} \endtitle \title\bf A.~Laurin\v cikas\unskip\rm,\quad \it The Universality of Some~Compositions on Short Intervals \page{449}\rpage{559} \endtitle \title\bf V.I.~Lotov and V.R.~Khodjibayev\unskip\rm,\quad \it Inequalities in a~Two-Sided Boundary Crossing Problem for Stochastic Processes \page{455}\rpage{567} \endtitle \title\bf D.V.~Lytkina and V.D.~Mazurov\unskip\rm,\quad \it Locally Finite Periodic Groups Saturated with Finite Simple Orthogonal Groups of Odd Dimension \page{462}\rpage{576} \endtitle \title\bf I.I. Matveeva\unskip\rm,\quad \it Estimates for Solutions to a~Class of Nonautonomous Systems of Neutral Type with Unbounded Delay \page{468}\rpage{583} \endtitle \title\bf N.M.~Poluboyarova\unskip\rm,\quad \it On~Stable Extremals of the Potential Energy Functional \page{482}\rpage{599} \endtitle \title\bf S.G. Pyatkov\unskip\rm,\quad \it Boundary Value and Inverse Problems for Some Classes of Nonclassical Operator-Differential Equations \page{489}\rpage{607} \endtitle \title\bf V.V.~Rybakov\unskip\rm,\quad \it Branching Time Logics with Multiagent Temporal Accessibility Relations \page{503}\rpage{623} \endtitle \title\bf J.M.~S\'{a}nchez\unskip\rm,\quad \it On Split Malcev Poisson Algebras \page{511}\rpage{633} \endtitle \title\bf A.A.~Stepanova and E.L.~Efremov\unskip\rm,\quad \it The Primitive Normality of a~Class of Weakly Injective \iftex $S$\else \boldmath S\fi -Acts \page{521}\rpage{644} \endtitle \title\bf E.I.~Timoshenko\unskip\rm,\quad \it Retracts and Verbally Closed Subgroups with~Respect to~Relatively Free Soluble Groups \page{537}\rpage{663} \endtitle \title\bf A.A.~Tolstonogov\unskip\rm,\quad \it A~Multivalued History-Dependent Operator and Implicit Evolution Inclusions.~I \page{545}\rpage{672} \endtitle \tocbreak \title\bf A.V.~Tsarev\unskip\rm,\quad \it A Generalization of Quotient Divisible Groups to the Infinite Rank Case \page{554--559}\rpage{683} \endtitle \title\bf V.A.~Sharafutdinov\unskip\rm,\quad \it Radon Transform on Sobolev Spaces \page{560}\rpage{690} \endtitle \endtoc \vskip2cm \begingroup\leftskip=1in\rightskip=1in\tenpoint\noindent {\it Siberian Mathematical Journal\/} is abstracted or indexed in ANVUR, CNKI, Dimensions, EBSCO Academic Search, EBSCO Advanced Placement Source, EBSCO Discovery Service, EBSCO STM Source, Google Scholar, Institute of Scientific and Technical Information of China, Japan\-ese Science and Technology Agency (JST), Journal Citation Reports/Science Edition Mathematical Reviews, Naver OCLC WorldCat Discovery Service, ProQuest Central, ProQuest Engineering, ProQuest Materials Science and Engineering Database, ProQuest SciTech Premium Collection, ProQuest Technology Collection, Pro\-Quest-ExLibris Primo, ProQuest-ExLibris Summon, SCImago, SCOPUS, Science Citation Index Expanded (SciSearch), TD Net Discovery Service, UGC-CARE List (India), zbMATH. \par\endgroup \begingroup\enddocument \documentstyle{SibMatJ} \issueyear{2021} \issuenumber{4} \pagenomo \toc \title\bf S.V.~Agapov, A.A.~Valyuzhenich, and V.V.~Shubin \unskip\rm,\quad \it Some Remarks on~High Degree Polynomial Integrals of the Magnetic Geodesic Flow on the Two-Dimensional Torus \page{581}\rpage{715} \endtitle \title\bf N.N.~Vorob'ev, I.I.~Staselka, and A.~Hojagulyyev\unskip\rm,\quad \it Separated Lattices of Multiply $\sigma $-Local Formations \page{586}\rpage{721} \endtitle \title\bf A.V.~Greshnov and R.I.~Zhukov\unskip\rm,\quad \it Horizontal Joinability in Canonical 3-Step Carnot Groups with Corank~2 Horizontal Distributions \page{598}\rpage{736} \endtitle \title\bf M.G. Grigoryan\unskip\rm,\quad \it On Unconditional and Absolute Convergence of the Haar Series in the Metric of $L^{p}[0,1]$ with $0