topology (point-set topology, point-free topology)
see also differential topology, algebraic topology, functional analysis and topological homotopy theory
Basic concepts
fiber space, space attachment
Extra stuff, structure, properties
Kolmogorov space, Hausdorff space, regular space, normal space
sequentially compact, countably compact, locally compact, sigma-compact, paracompact, countably paracompact, strongly compact
Examples
Basic statements
closed subspaces of compact Hausdorff spaces are equivalently compact subspaces
open subspaces of compact Hausdorff spaces are locally compact
compact spaces equivalently have converging subnet of every net
continuous metric space valued function on compact metric space is uniformly continuous
paracompact Hausdorff spaces equivalently admit subordinate partitions of unity
injective proper maps to locally compact spaces are equivalently the closed embeddings
locally compact and second-countable spaces are sigma-compact
Theorems
Analysis Theorems
A Cantor cube is a topological space of the form of a Cartesian product space where is some index set, hence a Cartesian product of copies of the 2-element set equipped with Tihonov topology.
Sometimes Cantor cubes are understood with their structure of a topological group being a direct product of copies of .
The basic example is the Cantor space .
In the generality of dyadic spaces:
Ryszard Engelking, pp. 231, 232, 291 in: General Topology, Sigma Series in Pure Mathematics 6, Heldermann (1989) [ISBN:388538-006-4, pdf]
Leonid B. Shapiro: Dyadic Compacta, Encyclopedia of General Topology (2003) 192-194 [doi:10.1016/B978-044450355-8/50052-0]
See also:
Last revised on August 18, 2025 at 09:25:06. See the history of this page for a list of all contributions to it.