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Search: All articles in the CMB digital archive with keyword metric space

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1. CMB Online first

Khamsi, M. A.
 Approximate Fixed Point Sequences of Nonlinear Semigroup in Metric Spaces In this paper, we investigate the common approximate fixed point sequences of nonexpansive semigroups of nonlinear mappings \$\{T_t\}_{t \geq 0}\$, i.e., a family such that \$T_0(x)=x\$, \$T_{s+t}=T_s(T_t(x))\$, where the domain is a metric space \$(M,d)\$. In particular we prove that under suitable conditions, the common approximate fixed point sequences set is the same as the common approximate fixed point sequences set of two mappings from the family. Then we use the Ishikawa iteration to construct a common approximate fixed point sequence of nonexpansive semigroups of nonlinear mappings. Keywords:approximate fixed point, fixed point, hyperbolic metric space, Ishikawa iterations, nonexpansive mapping, semigroup of mappings, uniformly convex hyperbolic spaceCategories:47H09, 46B20, 47H10, 47E10

2. CMB 2008 (vol 51 pp. 413)

Thé, L. Nguyen Van
 Big Ramsey Degrees and Divisibility in Classes of Ultrametric Spaces Given a countable set \$S\$ of positive reals, we study finite-dimensional Ramsey-theoretic properties of the countable ultrametric Urysohn space \$\textbf{Q} _S\$ with distances in \$S\$. Keywords:Ramsey theory, Urysohn metric spaces, ultrametric spacesCategories:05C50, 54E35

3. CMB 2007 (vol 50 pp. 291)

Sarkar, Rudra P.; Sengupta, Jyoti
 Beurling's Theorem and Characterization of Heat Kernel for Riemannian Symmetric Spaces of Noncompact Type We prove Beurling's theorem for rank \$1\$ Riemannian symmetric spaces and relate its consequences with the characterization of the heat kernel of the symmetric space. Keywords:Beurling's Theorem, Riemannian symmetric spaces, uncertainty principleCategories:22E30, 43A85