scholarly journals F-hypercyclic operators on Fréchet spaces

2019 ◽  
Vol 106 (120) ◽  
pp. 1-18 ◽  
Author(s):  
Marko Kostic
Keyword(s):  
Real Number ◽  
Arbitrary Real Number ◽  
Hypercyclic Operators ◽  
Fréchet Spaces ◽  
Open Problems ◽  
Separate Section ◽  
New Concepts ◽  
Continuous Operators

We investigate F-hypercyclicity of linear, not necessarily continuous, operators on Frechet spaces. The notion of lower (mn)-hypercyclicity seems to be new and not considered elsewhere even for linear continuous operators acting on Frechet spaces. We pay special attention to the study of q-frequent hypercyclicity, where q > 1 is an arbitrary real number. We present several new concepts and results for lower and upper densities in a separate section, providing also a great number of illustrative examples and open problems.

scholarly journals Quantifying Noninvertibility in Discrete Dynamical Systems

10.37236/9475 ◽  
2020 ◽  
Vol 27 (3) ◽  
Author(s):  
Colin Defant ◽  
James Propp
Keyword(s):  
Dynamical Systems ◽  
Real Number ◽  
Arbitrary Function ◽  
Discrete Dynamical Systems ◽  
Open Problems ◽  
Natural Measure ◽  
Stack Sorting ◽  
Finite Set

Given a finite set $X$ and a function $f:X\to X$, we define the \emph{degree of noninvertibility} of $f$ to be $\displaystyle\deg(f)=\frac{1}{|X|}\sum_{x\in X}|f^{-1}(f(x))|$. This is a natural measure of how far the function $f$ is from being bijective. We compute the degrees of noninvertibility of some specific discrete dynamical systems, including the Carolina solitaire map, iterates of the bubble sort map acting on permutations, bubble sort acting on multiset permutations, and a map that we call "nibble sort." We also obtain estimates for the degrees of noninvertibility of West's stack-sorting map and the Bulgarian solitaire map. We then turn our attention to arbitrary functions and their iterates. In order to compare the degree of noninvertibility of an arbitrary function $f:X\to X$ with that of its iterate $f^k$, we prove that \[\max_{\substack{f:X\to X\\ |X|=n}}\frac{\deg(f^k)}{\deg(f)^\gamma}=\Theta(n^{1-1/2^{k-1}})\] for every real number $\gamma\geq 2-1/2^{k-1}$. We end with several conjectures and open problems.  

A Short Proof of Vladimirskii′s Theorem on Precompact Perturbations in Locally Convex Spaces

1975 ◽  
Vol 18 (5) ◽  
pp. 649-655
Author(s):  
Le Quang Chu
Keyword(s):  
Compact Operator ◽  
Short Proof ◽  
Locally Convex Spaces ◽  
Fréchet Spaces ◽  
Continuous Operators ◽  
Locally Convex ◽  
Convex Spaces

Let T, P denote two continuous operators from E into F, where E and F are locally convex spaces. It is proved by L. Schwartz [8] and G. KÖthe [6] that if E and F are Fréchet spaces, T is a ϕ_-operator and P a compact operator, then T+P is a ϕ_-operator.

scholarly journals FUZZY INSTANTONS

2002 ◽  
Vol 17 (15) ◽  
pp. 2095-2111 ◽  
Author(s):  
HARALD GROSSE ◽  
MARCO MACEDA ◽  
JOHN MADORE ◽  
HAROLD STEINACKER
Keyword(s):  
Real Number ◽  
Matrix Model ◽  
Matrix Algebra ◽  
Quantization Condition ◽  
Constant Factor ◽  
Arbitrary Real Number ◽  
Self Duality ◽  
Duality Condition ◽  
The Matrix ◽  
Fixed Constant

We present a series of instanton-like solutions to a matrix model which satisfy a self-duality condition and possess an action whose value is, to within a fixed constant factor, an integer l2. For small values of the dimension n2 of the matrix algebra the integer resembles the result of a quantization condition but as n → ∞ the ratio l/n can tend to an arbitrary real number between zero and one.

scholarly journals Hypercyclic Operators on Non-normable Fréchet Spaces

1998 ◽  
Vol 159 (2) ◽  
pp. 587-595 ◽  
Author(s):  
José Bonet ◽  
Alfredo Peris
Keyword(s):  
Hypercyclic Operators ◽  
Fréchet Spaces

scholarly journals A problem of coefficient determination in parabolic equations solved as moment problem

2017 ◽  
Vol 6 (4) ◽  
pp. 109
Author(s):  
Maria Beatriz Pintarelli
Keyword(s):  
Boundary Conditions ◽  
Real Number ◽  
Moment Problem ◽  
Parabolic Equations ◽  
Arbitrary Real Number ◽  
Initial Condition ◽  
Moments Problem ◽  
Inverse Moment

The problem is to find a(t) y w(x; t) such that wt = a(t) (wx)x+r(x; t) under the initial condition w(x; 0) =fi(x) and the boundary conditions w(0; t) = 0 ; wx(0; t) = wx(1; t)+alfa w(1; t) about a region D ={(x; t); 0 <x < 1; t >0}. In addition it must be fulfilled the integral of w (x, t) with respect to x is equal to E(t) where fi(x) , r(x; t) and E(t) are known functions and alfa is an arbitrary real number other than zero.The objective is to solve the problem as an application of the inverse moment problem. We will find an approximated solution and bounds for the error of the estimated solution using the techniques on moments problem. In addition, the method is illustrated with several examples.

Vertex Connectivity of Fuzzy Graphs with Applications to Human Trafficking

2018 ◽  
Vol 14 (03) ◽  
pp. 457-485 ◽  
Author(s):  
Shanookha Ali ◽  
Sunil Mathew ◽  
John N. Mordeson ◽  
Hossein Rashmanlou
Keyword(s):  
Real Number ◽  
Human Trafficking ◽  
Dynamic Network ◽  
Arbitrary Real Number ◽  
Fuzzy Graph ◽  
Vertex Connectivity ◽  
The Past ◽  
Fuzzy Graphs ◽  
Number Formula ◽  
Fuzzy Vertex

Connectivity is the most important aspect of a dynamic network. It has been widely studied and applied in different perspectives in the past. In this paper, constructions of [Formula: see text]-connected fuzzy graphs for an arbitrary real number [Formula: see text] and average fuzzy vertex connectivity of fuzzy graphs are discussed. Average fuzzy vertex connectivity of fuzzy trees, fuzzy cycles and complete fuzzy graphs are studied. The concept of a uniformly [Formula: see text]-connected fuzzy graph is introduced and characterized towards the end. An application related to human trafficking is also discussed.

On numbers having finite beta-expansions

2009 ◽  
Vol 29 (5) ◽  
pp. 1659-1668 ◽  
Author(s):  
TOUFIK ZAÏMI
Keyword(s):  
Real Number ◽  
Fractional Part ◽  
Pisot Number ◽  
Real Numbers ◽  
Open Problems

AbstractLet β be a real number greater than one, and let ℤβ be the set of real numbers which have a zero fractional part when expanded in base β. We prove that β is a Pisot number when the set ℕβ−ℕβ−ℕβ is discrete, where ℕβ=ℤβ∩[0,∞[. We also give partial answers to some related open problems, and in particular, we show that β is a Pisot number when a sum ℤβ+⋯+ℤβ is a Meyer set.

scholarly journals On some mathematical properties of the general zeroth-order Randić coindex of graphs

2020 ◽  
Vol 12 (2) ◽  
pp. 75-82
Author(s):  
I. Milovanović ◽  
M. Matejić ◽  
E. Milovanović ◽  
A. Ali
Keyword(s):  
Real Number ◽  
Lower Bounds ◽  
Connected Graph ◽  
Degree Sequence ◽  
Tree Structure ◽  
Vertex Degree ◽  
Arbitrary Real Number ◽  
Zeroth Order ◽  
Mathematical Properties ◽  
Simple Connected Graph

Let G = (V,E), V = {v1, v2,..., vn}, be a simple connected graph of order n, size m with vertex degree sequence ∆ = d1 ≥ d2 ≥ ··· ≥ dn = d > 0, di = d(vi). Denote by G a complement of G. If vertices vi and v j are adjacent in G, we write i ~ j, otherwise we write i j. The general zeroth-order Randic coindex of ' G is defined as 0Ra(G) = ∑i j (d a-1 i + d a-1 j ) = ∑ n i=1 (n-1-di)d a-1 i , where a is an arbitrary real number. Similarly, general zerothorder Randic coindex of ' G is defined as 0Ra(G) = ∑ n i=1 di(n-1-di) a-1 . New lower bounds for 0Ra(G) and 0Ra(G) are obtained. A case when G has a tree structure is also covered.

scholarly journals Uniform Convergence and Spectra of Operators in a Class of Fréchet Spaces

2014 ◽  
Vol 2014 ◽  
pp. 1-16 ◽  
Author(s):  
Angela A. Albanese ◽  
José Bonet ◽  
Werner J. Ricker
Keyword(s):  
Banach Space ◽  
Uniform Convergence ◽  
Bounded Operator ◽  
Operator Norm ◽  
Ergodic Theorems ◽  
Fréchet Spaces ◽  
Norm Convergence ◽  
Operator Ideals ◽  
Weakly Compact ◽  
Continuous Operators

Well-known Banach space results (e.g., due to J. Koliha and Y. Katznelson/L. Tzafriri), which relate conditions on the spectrum of a bounded operatorTto the operator norm convergence of certain sequences of operators generated byT, are extended to the class of quojection Fréchet spaces. These results are then applied to establish various mean ergodic theorems for continuous operators acting in such Fréchet spaces and which belong to certain operator ideals, for example, compact, weakly compact, and Montel.

The characterization of a class of subspace pseudoframes with arbitrary real number translations

2009 ◽  
Vol 42 (5) ◽  
pp. 2696-2706 ◽  
Author(s):  
Qingjiang Chen ◽  
Zhi Shi ◽  
Huaixin Cao
Keyword(s):  
Real Number ◽  
Arbitrary Real Number
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