Countably -compact spaces.
Countably metacompact spaces in the constructible universe
We present a construction from ♢* of a first countable, regular, countably metacompact space with a closed discrete subspace that is not a . In addition some nonperfect spaces with σ-disjoint bases are constructed.
Countably -closed spaces
Countably z-compact spaces
In this work we study countably z-compact spaces and z-Lindelof spaces. Several new properties of them are given. It is proved that every countably z-compact space is pseuodocompact (a space on which every real valued continuous function is bounded). Spaces which are countably z-compact but not countably compact are given. It is proved that a space is countably z-compact iff every countable z-closed set is compact. Characterizations of countably z-compact and z-Lindelof spaces by multifunctions...
Counting linearly ordered spaces
For a transfinite cardinal κ and i ∈ 0,1,2 let be the class of all linearly ordered spaces X of size κ such that X is totally disconnected when i = 0, the topology of X is generated by a dense linear ordering of X when i = 1, and X is compact when i = 2. Thus every space in ℒ₁(κ) ∩ ℒ₂(κ) is connected and hence ℒ₁(κ) ∩ ℒ₂(κ) = ∅ if , and ℒ₀(κ) ∩ ℒ₁(κ) ∩ ℒ₂(κ) = ∅ for arbitrary κ. All spaces in ℒ₁(ℵ₀) are homeomorphic, while ℒ₂(ℵ₀) contains precisely ℵ₁ spaces up to homeomorphism. The class ℒ₁(κ)...
Counting shape and homotopy types among fundamental absolute neighborhood retracts: an elementary approach.
Coupled coincidence point and coupled common fixed point theorems in partially ordered metric spaces with -distance.
Coupled coincidence point theorems for nonlinear contractions in partially ordered quasi-metric spaces with a -function.
Coupled fixed point, -invariant set and fixed point of -order.
Coupled fixed point theorems for nonlinear contractions satisfied Mizoguchi-Takahashi's condition in quasiordered metric spaces.
Coupled fixed point theorems for (α, φ) g -contractive type mappings in partially ordered G-metric spaces
In this paper, we introduce a new concept of (α, φ)g-contractive type mappings and establish coupled coincidence and coupled common fixed point theorems for such mappings in partially ordered G-metric spaces. The results on fixed point theorems are generalizations of some existing results.We also give some examples to illustrate the usability of the obtained results.
Coupled fixed point theorems of integral type mappings in cone metric spaces
Courbe des trisecantes a une courbe lisse de P3 de degre d > 2g + 1.
Covariant and contravariant approaches to topology.
Covering dimension modulo a class of spaces
Covering dimension of fuzzy spaces
Covering dimension of inverse limit of fuzzy spaces
Covering dimensions and partitions of unity
Covering maps for locally path-connected spaces
We define Peano covering maps and prove basic properties analogous to classical covers. Their domain is always locally path-connected but the range may be an arbitrary topological space. One of characterizations of Peano covering maps is via the uniqueness of homotopy lifting property for all locally path-connected spaces. Regular Peano covering maps over path-connected spaces are shown to be identical with generalized regular covering maps introduced by Fischer and Zastrow....
Covering of a space by nowhere dense sets