Results 81 to 90 of about 1,420 (191)
P-FRECHET-URYSOHN PROPERTY OF FUNCTION-SPACES
, 1994 In this paper, we study the p-Frechet-Urysohn property of function spaces, for p is-an-element-of beta(omega)\omega. We prove that C(pi)(X) is p-Frechet-Urysohn if and only if X has (gamma(p)), where (gamma(p) is the natural p-version of property (gamma)
Tamariz, A, GarcíaFERREIRA, S
core
Sequential Outlier Detection in Nonstationary Time Series
Journal of Time Series Analysis, EarlyView.ABSTRACT A novel method for sequential outlier detection in nonstationary time series is proposed. The method tests the null hypothesis of “no outlier” at each time point, addressing the multiple testing problem by bounding the error probability of successive tests, using extreme‐value theory. The asymptotic properties of the test statistic are studied
Florian Heinrichs +2 more
wiley +1 more source
A Theory for Interpolation of Metric Spaces
AxiomsIn this work, we develop an interpolation theory for metric spaces inspired by the real method of interpolation. These interpolation spaces preserve Lipschitz operators under certain conditions.
Robledo Mak’s Miranda Sette +2 more
doaj +1 more source
Testing Distributional Granger Causality With Entropic Optimal Transport
Journal of Time Series Analysis, EarlyView.ABSTRACT We develop a novel nonparametric test for Granger causality in distribution based on entropic optimal transport. Unlike classical mean‐based approaches, the proposed method directly compares the full conditional distributions of a response variable with and without the history of a candidate predictor.
Tao Wang
wiley +1 more source
Mathematical Finance, EarlyView.ABSTRACT We study a dynamic portfolio optimization problem under the mean–variance–variance (M‐V‐V) criterion proposed by Maccheroni et al. It is an analogue of the Arrow–Pratt approximation to the well‐known smooth ambiguity model. Under the standard Black–Scholes framework, we derive fully explicit equilibrium investment strategies in which a DM's ...
David Landriault, Bin Li, Yuanyuan Zhang
wiley +1 more source
Edge‐Length Preserving Embeddings of Graphs Between Normed Spaces
Journal of Graph Theory, Volume 112, Issue 4, Page 491-506, August 2026.ABSTRACT The concept of graph embeddability, initially formalized by Belk and Connelly and later expanded by Sitharam and Willoughby, extends the question of embedding finite metric spaces into a given normed space. A finite simple graph G = ( V , E ) is said to be ( X , Y )‐embeddable if any set of induced edge lengths from an embedding of G into a ...
Sean Dewar +3 more
wiley +1 more source
The d-Uniform Differentiability in Frechet Spaces [PDF]
, 2005 无穷维空间上凸函数微分理论的研究已经有七十多年的历史了．它在最优化理论、控制论、数学规划、大范围分析、无穷维动力系统、生物数学与生物工程、金融数学与金融工程、非线形分析等领域都有广泛的应用。本文主要是在可度量化的局部凸空间中引入了d-一致可微性。并证明了连续凸函数的d-一致可微点可表示成可数多个G_{\delta}集的并，因而是Borel集.在一般情况下，这种可微性是强于Frechet可微性的，但是在赋范空间中，它与Frechet可微性是等价的，而且在本文我们也证明了在一类特殊的Frechet空间中 ...
叶洪波
core
On Fuzzy Fréchet Contractions Governed by Rational Expressions and Related Applications
Journal of Applied Science and Engineering. This work explores a specific category of contraction mappings characterized by rational- type within the framework of fuzzy Fréchet spaces(FFS). By utilizing the triangular inequality associated with fuzzy seminorms, we establish fixed point results ...
Ahmed Ghanawi Jasim
doaj +1 more source
On a System of Volterra Type Hadamard Fractional Integral Equations in Fréchet Spaces
Discrete Dynamics in Nature and Society, 2018 In this article we present some results concerning the existence of solutions for a system of Hadamard integral equations. Our investigation is conducted with an application of an extension of the fixed point theorem of Burton-Kirk in Fréchet spaces.
Saïd Abbas +2 more
doaj +1 more source
Numerical Methods for Partial Differential Equations, Volume 42, Issue 4, July 2026.ABSTRACT While recent Anderson acceleration (AA) convergence theory [Pollock et al., IMA Num. An., 2021] requires that the AA optimization norm match the Hilbert space norm associated with the fixed point operator, in implementations the ℓ2$$ {\ell}^2 $$ norm is the most common choice. So far there is little research done regarding this discrepancy. To
Elizabeth Hawkins, Leo G. Rebholz
wiley +1 more source