It is established that any algorithmic representation of any field in a signature with an additive inverse operation that has a nontrivial enumerable subset is negative. In this case, computably and enumerably generated topologies coincide, and the operations are continuous with respect to the enumerably generated topology.
| Mualliflar | Karimova, N. |
|---|---|
| Jurnal | O‘zbekiston matematika jurnali |
| Nashr sanasi | 2026-07-02 |
| Jild | 70 |
| Son | 2 |
| Betlar | 115-120 |
| Til | Ingliz |
| DOI | 10.29229/uzmj.2026-2-14 |
DOI: 10.29229/uzmj.2026-2-14 · Maqolaning asl sahifasi
field with additive inversion, algorithmic representation, effectively generated topology, negativity and positivity, continuity
We consider the critical Galton-Watson branching process a special form and possibly with the infinite variance the number of descendants of one particle. Local limit theorem for such process proved.
Catalan-Mihailescu Theorem states that the only case of difference between two consecutive powers equals 1 is $3^2 -2^3$. This article provides some elementary analyses of integer powers, and proves in that light…
At present the fundamental solutions of the multidimensional singular elliptic equation are known and they are expressed through the well-known Lauricella function $F_A^{(n)}$, the number of variables of which is equal…
This paper investigates an inverse problem for a system of mixed-type second-order differential equations with a variable time direction. The problem involves finding the unknown right-hand side functions from the…
This article investigates two-dimensional integrals involving singularities and multiplicative compositions. The main focus is on deriving lower and upper bounds under various assumptions on the primary function…
We find all the eta quotients in the spaces $M_{1}\left(\Gamma_{0}(20), \left(\frac{d}{*}\right)\right)$ with $d = -4, -20$ of modular forms, and we determine their Fourier coefficients, where $\left(\frac{d}{*}\right)$…
Inspired by quantum mechanics, we introduce a weak form of solutions for differential equations. We show that Schrödinger equation is a weak form of the classical Euler-Lagrange equation.
This work introduces an efficient methodology for approximating solutions to first-order non-linear differential equations. The approach is based on formulating a differential equation with piecewise constant arguments…
We present fixed point theorem for a new type of nonlinear contractive mappings in $\mathfrak{b}$-metric spaces. Also, we present examples to illustrate the validity of the results obtained in the paper. In addition, by…
In this paper, an evasion game for an infinite system of ternary differential equations is studied. The game is considered in the Hilbert space $l_{2}$. The control parameters of pursuer and evader are subject to…