If and only if for all x in X and closed sets C with x not in C, there exists open sets U and V such that x is in U, C is a subset of V and U and V do not intersect
In mathematics, a zero-dimensional topological space is a topological space that ... any point in the space is contained in exactly one open set of this refinement.
A topological domain is a connected and open subset of a topological space. Key characteristics include being connected, open, and having a well-defined boundary. These characteristics impact the overall structure of the space by determining how the domain interacts with the rest of the space and how it can be manipulated or transformed within the space.
A topological space is simply a set, B, with topology t (see the related link for a definition), and is often denoted as B, t which is similar to how a metric space is often denoted; B, D.
A Betti number is a number associated to each topological space and dimension, giving an approximate number of holes of that dimension in that space.
no
A family of subsets of the direct product of a topological space with itself that is used to derive a uniform topology for the space. Also known as uniform structure.
The wikipedia article says, 'The definition of a topological space relies only uponset theory and is the most general notion of a mathematical "space" that allows for the definition of concepts such as continuity, connectedness, and convergence.'These are abstract spaces where distance is, in some sense, ignored. When Euler considered the 'seven bridges of Koenigsberg problem', for instance, he appreciated that he was ignoring the distances between the bridges and was considering only how they were connected--so that someone could traverse each of them just once. Since that time, of course, the idea of a topological space has permeated many areas of mathematics.See the related link.
Maria Fragoulopoulou has written: 'Topological algebras with involution' -- subject(s): Topological algebras 'An introduction of the representation theory of topological *-algebras' -- subject(s): Topological algebras, Representations of algebras
The n-sphere is denoted Sn. It is an example of a compact topological manifold without boundary.
A discrete topology on the integers, Z, is defined by letting every subset of Z be open If that is true then Z is a discrete topological space and it is equipped with a discrete topology. Now is it compact? We know that a discrete space is compact if and only if it is finite. Clearly Z is not finite, so the answer is no. If you picked a finite field such a Z7 ( integers mod 7) then the answer would be yes.
R. Lowen has written: 'On the existence of natural non-topological, fuzzy topological spaces' -- subject(s): Topological spaces, Fuzzy sets
Eduard Cech has written: 'Point sets' -- subject(s): Set theory, Topological spaces 'Topological spaces' -- subject(s): Topological spaces