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On Shavrukov's non-isomorphism theorem for diagonalizable algebras
Review of Symbolic Logic. 2022. P. 1–38.
Kolmakov E.
We prove a strengthened version of Shavrukov’s result on the non-isomorphism of diagonalizable algebras of two Σ1-sound theories, based on the improvements previously found by Adamsson. We then obtain several corollaries to the strengthened result by applying it to various pairs of theories and obtain new non-isomorphism examples. In particular, we show that there are no surjective homomorphisms from the algebra (LT,◻T◻T) onto the algebra (LT,◻T) . The case of bimodal diagonalizable algebras is also considered. We give several examples of pairs of theories with isomorphic diagonalizable algebras but non-isomorphic bimodal diagonalizable algebras.
Basalaev A., Rarovskii A., Journal of Singularities 2026 Vol. 30 P. 61–80
Saito theory associates to an isolated singularity rich structure that plays an important role in mirror symmetry. In this note we construct Saito theory for A and D type Landau-Ginzburg orbifolds. Namely, for the pairs (f,G), where f defines an isolated singularity of A and D type and G is a group of symmetries of ...
Added: September 1, 2026
Rybakov M., Shkatov D., Journal of Logic and Computation 2026 Vol. 36 No. 6 Article exag026
We prove Pi-1-1-hardness, and thus lack of recursive axiomatizability, of constant-domain modal predicate logics defined by a class of Dedekind complete linear Kripke frames containing a frame with an infinitely increasing chain of worlds. The result holds even for the language with one unary predicate letter, one propositional letter, and two individual variables. ...
Added: September 1, 2026
Селянин Ф. И., Moscow Mathematical Journal 2026 Vol. 26 No. 2 P. 167–187
Minkowski mixed volume of n subpolytopes D1,…,Dn of a polytope P⊂Rn clearly does not exceed the normalized volume n!Vol(P). Equality holds if and only if the subpolytopes are interlaced, i.e., each proper face F⊊P intersects at least dim(F)+1 of the polytopes Di. Efficiently computing mixed volumes for more general collections of subpolytopes is crucial for estimating the complexity of numerically solving polynomial systems.
Motivated by relaxing the bound dim(F)+1 to dim(F), we ...
Added: August 31, 2026
Kazaryan M., Dunin-Barkowski P., Bychkov B. et al., International Mathematics Research Notices 2026 Vol. 14 Article rnag146
We prove a recent conjecture of the fourth named author with P. Norbury that states a system of universal polynomial relations among the kappa classes on the moduli spaces of algebraic curves. The proof involves localization and materialization analysis of the spin Gromov–Witten theory of the projective line and is dictated by Z 2 -equivariant ...
Added: August 31, 2026
Kazaryan M., Dunin-Barkowski P., Bychkov B. et al., Communications in Mathematical Physics 2026 Vol. 407 No. 69
We prove that for any initial data on a genus zero spectral curve the cor responding correlation differentials of topological recursion are KP integrable. As an application we prove KP integrability of partition functions associated via ELSV-type formulas to the r-th roots of the twisted powers of the log canonical bundles ...
Added: August 31, 2026
Gromov V., Переслегин С. Б., Переслегина Е. Б. et al., СПб.: Полакс, 2026.
Механизм происходящих в мире изменений носит эволюционный, а не экологический характер. Иначе говоря, Человечество столкнулось с кризисом развития, который имеет три независимые составляющие: кризис индустриального общества (фазовый кризис), кризис научного мышления (эпистемный кризис) и кризис формата существования разума (социосистемный кризис). Доклад посвящён аспектам этого триединого кризиса и возможным путям его преодоления, не сводящимся к первичному ...
Added: August 31, 2026
Devyatov R. A., Mathematical notes 2026 Vol. 119 No. 3 P. 782–786
Let G/B be a flag variety over ℂ, where G is a simple algebraic group with a simply laced Dynkin diagram, and B is a Borel subgroup. We say that the product of classes of Schubert divisors in the Chow ring is multiplicity free if it is possible to multiply it by a Schubert class ...
Added: August 30, 2026
Bayer A., Kuznetsov A., Macrì E., Journal fuer die reine und angewandte Mathematik 2026 Vol. 2026 No. 836 P. 111–162
We give a self-contained and simplified proof of Mukai’s classification of prime Fano threefolds of index 1 and genus g ≥ 6 with at most factorial terminal singularities, and of its extension to higher dimension. ...
Added: August 30, 2026
Bayer A., Kuznetsov A., Macrì E., Compositio Mathematica 2026 Vol. 162 No. 1 P. 59–99
We give a proof of Mukai’s theorem on the existence of certain exceptional vector bundles on prime Fano threefolds. To our knowledge this is the first complete proof in the literature. The result is essential for Mukai’s biregular classification of prime Fano threefolds, and for the existence of semiorthogonal decompositions in their derived categories. Our ...
Added: August 30, 2026
Guseva L., Novikov A., Advances in Mathematics 2026 Vol. 503 Article 111211
We prove that the Kuznetsov–Polishchuk exceptional collections on rational homogeneous spaces of the symplectic groups Sp(2n,C) are full and consist of vector bundles. To achieve this, we construct several classes of complexes, which we call generalized staircase complexes, symplectic staircase complexes and secondary staircase complexes — each of which may be of independent interest. ...
Added: August 30, 2026
Polishchuk A., Rains E., Journal of the Institute of Mathematics of Jussieu 2026 Vol. 25 No. 1 P. 339–373
We prove that for every relatively prime pair of integers (d,r) with r>0, there exists an exceptional pair (O,V) on any del Pezzo surface of degree 4, such that V is a bundle of rank r and degree d. As an application, we prove that every Feigin-Odesskii Poisson bracket on a projective space can be ...
Added: August 30, 2026
Kazhdan D., Polishchuk A., Pure and Applied Mathematics Quarterly 2026 Vol. 22 No. 3 P. 1115–1166
We continue the study of automorphic functions associated with a curve C over the ring k[ε]/(ε²), where k is a finite field, begun in arXiv:2303.16259. Namely, we study an example of theta-lifting in this framework and show that it can be understood in terms of the orbit decomposition of the space of automorphic functions S(SL₂(F)\SL₂(A_C)) ...
Added: August 30, 2026
Kuznetsov A. P., Sataev I. R., Stankevich N., Chaos 2026 Vol. 36 No. 8 Article 083131
A radio-physical system, namely, a two-mode van der Pol generator, is considered. It is shown that this system demonstrates two types of chaos: with one and two zero Lyapunov exponents. The regions of the second type of chaos are surrounded by bifurcation lines of invariant tori doubling. Quasi-periodic structures of various shapes are embedded within ...
Added: August 30, 2026
Shirokov N. A., Rozenblum G., Israel Journal of Mathematics 2026 P. 1–30
We establish that a generalized H\¨older continuous function on an (m−2)-Ahlfors regular compact set in Rm can be approximated by solutions of an elliptic equation, with the rate of approximation determined by the continuity modulus of the function ...
Added: August 29, 2026
Dragalina-Chernaya E., 2024 Т. 13 № 1 С. 15–32
В статье сопоставляются принципы инвариантности, предлагаемые аналитической и феноменологической традициями для демаркации границ формальных и региональных онтологий. Принцип инвариантности относительно изоморфных преобразований, обобщающий критерий Альфреда Тарского для логических понятий, распространяется на формальную онтологию как теорию многообразий в ее феноменологической интерпретации. Особое внимание уделяется дискуссии аналитической и феноменологической традиций о синтетическом (материальном) априори и тому вкладу, ...
Added: February 3, 2024
Iarkova V., Ситькова А. С., Евразийский гуманитарный журнал 2023 № 2 С. 22–30
Isomorphism plays a key role in understanding the functioning patterns of diverse systems, especially a system of language. This article provides a concise overview of the accumulated knowledge of isomorphism from the perspective of philosophy and linguistics spanning from the latter half of the 20th century to the early 21st century. As a rule, isomorphism ...
Added: November 12, 2023
Dragalina-Chernaya E., В кн.: Тринадцатые Смирновские чтения: материалы Междунар. науч. конф., Москва, 22–24 июня 2023 г.: М.: Философский факультет МГУ, 2023. С. 74–76.
Выявляются основания и ограничения трактовки теории обобщенной квантификации как «логики кардинальности» в абстрактной теории моделей и в нейропсихологических исследованиях обыденных рассуждений ...
Added: June 22, 2023
Kolmakov E., Доклады Российской академии наук. Математика, информатика, процессы управления (ранее - Доклады Академии Наук. Математика) 2022 Т. 499 № 1 С. 26–30
Мы получаем усиление теоремы В.Ю. Шаврукова о неизоморфизме алгебр доказуемости двух Σ1-корректных теорий, основываясь на результатах, полученных Г. Адамссоном. Усиленное достаточное условие неизоморфизма позволяет построить новые примеры пар теорий с неизоморфными алгебрами. В частности, мы доказываем отсутствие эпиморфизмов из алгебры (LT,□T□T) на алгебру (LT,□T). ...
Added: June 30, 2022
Suvorov A., Петренко А. А., Аликин А. В., Информационные технологии и вычислительные системы 2021 № 4 С. 100–110
The article is devoted to solving the problems of search engine optimization of single-page applications built based on modern technologies of reactive JavaScript, including such JavaScript-frameworks as React, Angular, Vue, which allow developers to quickly create and scale interactive applications. However, such single page application is a complex area with a huge number of nuances ...
Added: November 16, 2021
Chrabaszcz A., Onischik E., Dragoy O., Second Language Research 2022 Vol. 38 No. 4 P. 839–867
This study examines the role of cross-linguistic transfer versus general processing strategy in two groups of heritage speakers (n = 28 per group) with the same heritage language – Russian – and typologically different dominant languages: English and Estonian. A group of homeland Russian speakers (n = 36) is tested to provide baseline comparison. Within the framework ...
Added: October 27, 2021
N.M. Suvorov, L.N. Lyadova, Proceedings of the Institute for System Programming of the RAS 2021 Vol. 33 No. 4 P. 163–176
Visual modeling is widely used nowadays, but the existing modeling platforms cannot meet all the user requirements. Visual languages are usually based on graph models, but the graph types used have significant restrictions. A new graph model, called HP-graph, whose main element is a set of poles, the subsets of which are combined into vertices ...
Added: October 23, 2021
Lomonosov T., Journal of Mathematical Sciences 2021 Vol. 255 No. 4 P. 459–466
We propose an algorithm for linearizing systems of partial differential equations at constant solutions. The algorithm is based on an isomorphism constructed between the ring of linearized functions and the ring of special matrices, which makes it possible to simplify calculations in the process of linearization. The algorithm is illustrated by applying it to the ...
Added: May 9, 2021
Леонидов А. В., Vasilyev S., Серебрянникова Е. Е. et al., В кн.: Проблемы управления и моделирования в сложных системах: Труды XXI Международной конференции. В 2-х томах.: Самара: ООО «Офорт», 2019. С. 221–224.
Graph is a universal representation of different social and economic systems. Vertices of a graph represent objects of different kind and edges describe interrelations between these objects. Vertices and edges can be characterized by a set of attributes describing different properties of objects and relations between them. A graph is called a multi-graph If its ...
Added: December 20, 2019
Миняев М., Нифантьев И., Тавторкин А. et al., Acta Crystallographica. Section C, Structural chemistry 2017 Vol. 73 P. 820–827
The crystal structures of rare-earth diaryl- or dialkylphosphate derivatives are poorly explored. Crystals of bis[bis(2,6-diisopropylphenyl) phosphato-kappa O] chloridotetrakis( methanol-kappa O) neodymium methanol disolvate, [Nd(C24H34O4P)Cl( CH4O)(4)]center dot 2CH(3)OH, (1), and of the lutetium, [Lu(C24H34O4P) Cl(CH4O)(4)]center dot-2CH(3)OH, (2), and yttrium, [Y(C24H34O4P) Cl(CH4O)(4)]center dot 2CH(3)OH,(3), analogues have been obtained by reactions between lithium bis(2,6-diisopropylphenyl)-phosphate and LnCl(3)(H2O)(6) (in a ...
Added: October 4, 2019