Zetkina Alena Igorevna

Publications in Math-Net.Ru

1. Undecidable fragments of positive theories of free semigroups
   
   Sibirsk. Mat. Zh., 66:5 (2025),  854–869
2. On equations in free groups with commutant restrictions on solutions
   
   Prikl. Diskr. Mat., 2024, no. 66,  5–13
3. The problem of solvability of a positive theory of an arbitrary group is algorithmically unsolvable
   
   Chebyshevskii Sb., 24:1 (2023),  40–49
4. An extension of a theorem of Neumann
   
   Mat. Tr., 26:1 (2023),  41–46
5. On equations in free monoids and semigroups with restrictions on solutions
   
   Prikl. Diskr. Mat., 2023, no. 59,  5–19
6. Violation of finite approximability for single-coefficient commutant equations
   
   Vestnik TVGU. Ser. Prikl. Matem. [Herald of Tver State University. Ser. Appl. Math.], 2022, no. 2,  5–13
7. On “simple” algorithmically undecidable fragments of elementary theory of an infinitely generated free semigroup
   
   Chebyshevskii Sb., 21:4 (2020),  56–71
8. On elementary theories of algebraically closed groups
   
   Chebyshevskii Sb., 21:1 (2020),  186–199
9. On equations and inequalities in words and word lengths
   
   Chebyshevskii Sb., 17:2 (2016),  137–145
10. On amenable subgroups of $F$-groups
    
    Chebyshevskii Sb., 17:2 (2016),  128–136
11. About the coNP-complete “Injective knapsack” problem
    
    Prikl. Diskr. Mat., 2016, no. 3(33),  85–92
12. On the Tits’ alternative for subgroups of $F$-groups
    
    Chebyshevskii Sb., 15:1 (2014),  110–120
13. On automorphic reducibility for sets elements of free groups
    
    Chebyshevskii Sb., 14:3 (2013),  52–55
14. An algebraically closed groups
    
    Chebyshevskii Sb., 14:3 (2013),  49–51