Vietnam Journal of Mathematics
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Linear Combination of Two Composition Operators Between Different Fock Spaces
Vietnam Journal of Mathematics - Tập 50 - Trang 151-159 - 2021
We investigate boundedness and compactness of linear combinations of two composition operators acting between different Fock spaces in several variables.
Berezin Number and Numerical Radius Inequalities
Vietnam Journal of Mathematics - - Trang 1-13 - 2023
We present several inequalities of the Berezin norm and Berezin number for reproducing kernel Hilbert space operators which improve the existing bounds. Among these inequalities, it is shown that if A be a bounded linear operator on a reproducing kernel Hilbert space, then
$$ {\textbf {ber}}^2(A) \le \frac{1}{4}{\textbf {ber}}^2(|A|+i|A...... hiện toàn bộ
The Set of Orthogonal Tensor Trains
Vietnam Journal of Mathematics - Tập 50 - Trang 599-613 - 2022
In this paper we study the set of tensors that admit a special type of decomposition called an orthogonal tensor train decomposition. Finding equations defining varieties of low-rank tensors is generally a hard problem, however, the set of orthogonally decomposable tensors is defined by appealing quadratic equations. The tensors we consider are an extension of orthogonally decomposable tensors. We...... hiện toàn bộ
The Adaptive Parameter Control Method and Linear Vector Optimization
Vietnam Journal of Mathematics - Tập 43 - Trang 471-486 - 2015
The question of constructing a set of equidistant points, with a given small approximate distance, in the efficient and weakly efficient frontiers of a linear vector optimization problem of a general form, is considered in this paper. It is shown that the question can be solved by combining Pascoletti–Serafini’s scalarization method (1984) and Eichfelder’s adaptive parameter control method (2009) ...... hiện toàn bộ
Non-solvable Groups whose Character Degree Graph has a Cut-Vertex. I
Vietnam Journal of Mathematics - Tập 51 - Trang 731-753 - 2023
Let G be a finite group. Denoting by
$$\textrm{cd}(G)$$
the set of degrees of the irreducible complex characters of G, we consider the character degree graph of G: this is the (simple undirected) graph whose vertices are the prime divisors of the numbers in
...... hiện toàn bộ
The Homotopy Type of the Complement to a System of Complex Lines in ℂ2
Vietnam Journal of Mathematics - Tập 42 - Trang 365-375 - 2014
Using the braid monodromy presentation for the fundamental group of the complement to a system of complex lines in ℂ
2, we suggest a CW model for the homotopy type of that complement that modified our previous one
$ C(\mathcal A)$
...... hiện toàn bộ
Torsion Type Invariants of Singularities
Vietnam Journal of Mathematics - Tập 49 - Trang 381-432 - 2021
Inspired by the LG/CY correspondence, we study the local index theory of the Schrödinger operator associated to a singularity defined on
$\mathbb {C}^{n}$
by a quasi-homogeneous polynomial f. Under some mild assumption to f, we show that the small time heat kernel expansion of the corresponding Sc...... hiện toàn bộ
A Finite Element/Neural Network Framework for Modeling Suspensions of Non-spherical ParticlesAbstract An accurate prediction of the translational and rotational motion of particles suspended in a fluid is only possible if a complete set of correlations for the force coefficients of fluid-particle interaction is known. The present study is thus devoted to the derivation and validation of a new framework to determine the drag, lift, rotational and pitching to... ... hiện toàn bộ
Vietnam Journal of Mathematics - - 2021
Tổng số: 452
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