Ultraconnected space
In mathematics, a topological space  is said to be ultraconnected if no pair of nonempty closed sets of
 is said to be ultraconnected if no pair of nonempty closed sets of  is disjoint. Equivalently, a space is ultraconnected if and only if the closures of two distinct points always have non trivial intersection. Hence, no
 is disjoint. Equivalently, a space is ultraconnected if and only if the closures of two distinct points always have non trivial intersection. Hence, no  space with more than 1 point is ultraconnected.[1]
 space with more than 1 point is ultraconnected.[1]
All ultraconnected spaces are path-connected (but not necessarily arc connected[1]), normal, limit point compact, and pseudocompact.
See also
Notes
References
- This article incorporates material from Ultraconnected space on PlanetMath, which is licensed under the Creative Commons Attribution/Share-Alike License.
- Lynn Arthur Steen and J. Arthur Seebach, Jr., Counterexamples in Topology. Springer-Verlag, New York, 1978. Reprinted by Dover Publications, New York, 1995. ISBN 0-486-68735-X (Dover edition).
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