Zobrazeno 1 - 10
of 83
pro vyhledávání: '"Itzá-Ortiz, Benjamín A."'
We prove that the closure of the numerical range of a $(n+1)$-periodic and $(2m+1)$-banded Toeplitz operator can be expressed as the closure of the convex hull of the uncountable union of numerical ranges of certain symbol matrices. In contrast to th
Externí odkaz:
http://arxiv.org/abs/2308.12353
Publikováno v:
J. Korean Math. Soc. 2022; 59(5): 997-1013
In this paper we give conditions on a matrix which guarantee that it is similar to a centrosymmetric matrix. We use this conditions to show that some $4 \times 4$ and $6 \times 6$ Toeplitz matrices are similar to centrosymmetric matrices. Furthermore
Externí odkaz:
http://arxiv.org/abs/2210.04594
Based on the well-known Detrended Fluctuation Analysis (DFA) for time series, in this work we describe a DFA for continuous real variable functions. Under certain conditions, DFA accurately predicts the long-term auto-correlation of the time series,
Externí odkaz:
http://arxiv.org/abs/2203.15940
Publikováno v:
Commun. Nonlinear Sci. Numer. Simulat. 87 (2020) 105274
In this paper a stability analysis for a Cournot duopoly model with tax evasion and time-delay in a continuous-time framework is presented. The mathematical model under consideration follows a gradient dynamics approach, is nonlinear and four-dimensi
Externí odkaz:
http://arxiv.org/abs/2103.02719
Publikováno v:
LINEAR AND MULTILINEAR ALGEBRA, 2021, VOL. 69, 2830-2849
In this paper we prove a conjecture stated by the first two authors establishing the closure of the numerical range of a certain class of $n+1$-periodic tridiagonal operators as the convex hull of the numerical ranges of two tridiagonal $(n+1) \times
Externí odkaz:
http://arxiv.org/abs/2103.01866
In this paper we show that the closure of the numerical range of an $n+1$-periodic tridiagonal operator is equal to the numerical range of a $2(n+1)\times 2(n+1)$ complex matrix.
Comment: 14 pages
Comment: 14 pages
Externí odkaz:
http://arxiv.org/abs/2102.13259
Publikováno v:
Topology and its Applications 315(2022) 108140
Cell structures were introduced by W. Debski and E. Tymchatyn as a way to study some classes of topological spaces and their continuous functions by means of discrete approximations. In this work we weaken the notion of cell structure and prove that
Externí odkaz:
http://arxiv.org/abs/2102.07905
Given a point $(p,q)$ with nonnegative integer coordinates and $p\not=q$, we prove that the quadratic B\'ezier curve relative to the points $(p,q)$, $(0,0)$ and $(q,p)$ is approximately the envelope of a family of segments whose endpoints are the B\'
Externí odkaz:
http://arxiv.org/abs/2012.11770
Autor:
Villafuerte-Segura, Raúl, Itzá-Ortiz, Benjamín A., López-Pérez, Pablo A., Alvarado-Santos, Eduardo
In this paper, a fractional Lotka-Volterra mathematical model for a bioreactor is proposed and used to fit the data provided by a bioprocess known as continuous fermentation of Zymomonas mobilis. The model contemplates a time-delay $\tau$ due to the
Externí odkaz:
http://arxiv.org/abs/2008.13083
Publikováno v:
Linear and multilinear algebra (2020)
In this paper we compute the closure of the numerical range of certain periodic tridiagonal operators. This is achieved by showing that the closure of the numerical range of such operators can be expressed as the closure of the convex hull of the unc
Externí odkaz:
http://arxiv.org/abs/1910.00720