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Displaying 621 – 640 of 674

Two cardinal inequalities for functionally Hausdorff spaces

Alessandro Fedeli (1994)

Commentationes Mathematicae Universitatis Carolinae

In this paper, two cardinal inequalities for functionally Hausdorff spaces are established. A bound on the cardinality of the $τ θ$ -closed hull of a subset of a functionally Hausdorff space is given. Moreover, the following theorem is proved: if $X$ is a functionally Hausdorff space, then $| X | \leq 2^{χ (X) wcd (X)}$ .

Two classes of almost periodic functions on topological $T_{0}$ -groups

Boseck, H. (1967)

General Topology and its Relations to Modern Analysis and Algebra

Two classes of locally compact sober spaces.

Belaid, Karim, Echi, Othman, Gargouri, Riyadh (2005)

International Journal of Mathematics and Mathematical Sciences

Two closed categories of filters

Andreas Blass (1977)

Fundamenta Mathematicae

Two countable, biconnected, not widely connected Hausdorff spaces.

Tzannes, V. (1999)

International Journal of Mathematics and Mathematical Sciences

Two countable Hausdorff almost regular spaces every continuous map of which into every Urysohn space is constant.

Tzannes, V. (1991)

International Journal of Mathematics and Mathematical Sciences

Two criteria thrusting simple connectedness on manifolds

P. H. Doyle (1974)

Colloquium Mathematicae

Two examples concerning small intrinsic isometries

John Cobb (1988)

Fundamenta Mathematicae

Two examples of non-separable metrizable spaces

R. Pol (1975)

Colloquium Mathematicae

Two examples of pseudo-radial spaces

Petr Simon, Gino Tironi (1986)

Commentationes Mathematicae Universitatis Carolinae

Two Examples of Q-topologies

Rade Živaljević (1984)

Publications de l'Institut Mathématique

Two examples of Q-topologies.

Živaljević, Rade (1984)

Publications de l'Institut Mathématique. Nouvelle Série

Two examples of reflections

Pelant, Jan, Vilímovský, Jiří (1976)

Seminar Uniform Spaces

Two extension theorems for functions

Pu, H.W., Pu, H.H. (1975)

Portugaliae mathematica

Two fixed point theorems for generalized contractions with constants in complete metric space

Ovidiu Popescu (2009)

Open Mathematics

In this paper we prove two fixed point theorems for generalized contractions with constants in complete metric space, which are generalizations of very recent results of Kikkawa and Suzuki.

Two general fixed point theorems on three complete metric spaces.

Popa, Valeriu (2000)

Novi Sad Journal of Mathematics

Two generic results in fixed point theory

Simeon Reich, Alexander J. Zaslavski (2007)

Banach Center Publications

We give two examples of the generic approach to fixed point theory. The first example is concerned with the asymptotic behavior of infinite products of nonexpansive mappings in Banach spaces and the second with the existence and stability of fixed points of continuous mappings in finite-dimensional Euclidean spaces.

Two improvements on Tkačenko's addition theorem

János Gerlits, István Juhász, Zoltán Szentmiklóssy (2005)

Commentationes Mathematicae Universitatis Carolinae

We prove that (A) if a countably compact space is the union of countably many $D$ subspaces then it is compact; (B) if a compact $T_{2}$ space is the union of fewer than $N (ℝ)$ = $cov (ℳ)$ left-separated subspaces then it is scattered. Both (A) and (B) improve results of Tkačenko from 1979; (A) also answers a question that was raised by Arhangel’skiǐ and improves a result of Gruenhage.

Two kinds of chaos and relations between them.

Lampart, M. (2003)

Acta Mathematica Universitatis Comenianae. New Series

Two non-homeomorphic countable spaces having homeomorphic squares

M. M. Marjanović, Ante R. Vučemilović (1985)

Commentationes Mathematicae Universitatis Carolinae

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