Connected topological group

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This article defines a property that can be evaluated for a topological group (usually, a T0 topological group)
View a complete list of such properties


Symbol-free definition

A topological group is termed connected if it satisfies the following equivalent conditions:

  1. It is connected as a topological space.
  2. The connected component of the identity element equals the whole group.

Equivalence of definitions

Definitions (1) and (2) are clearly equivalent.

Alternative definition for a locally connected topological group

For a locally connected topological group, being connected is equivalent to having no proper open subgroup.


  1. Connected implies no proper open subgroup