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Concept
Ultraconnected space
Summary
In mathematics, a topological space is said to be ultraconnected if no two nonempty closed sets are disjoint. Equivalently, a space is ultraconnected if and only if the closures of two distinct points always have non trivial intersection. Hence, no T1 space with more than one point is ultraconnected.
Every ultraconnected space is path-connected (but not necessarily arc connected). If and are two points of and is a point in the intersection , the function defined by if , and if , is a continuous path between and .
Every ultraconnected space is normal, limit point compact, and pseudocompact.
The following are examples of ultraconnected topological spaces.
A set with the indiscrete topology.
The Sierpiński space.
A set with the excluded point topology.
The right order topology on the real line.
Official source
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