A subset of a topological group which is closed as a subset and also a subgroup.
Closed Subgroup
See also
Effective Action, Free Action, Group, Group Orbit, Group Representation, Isotropy Group, Lie Group Quotient Space, Matrix Group, Topological Group, TransitiveThis entry contributed by Todd Rowland
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Cite this as:
Rowland, Todd. "Closed Subgroup." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/ClosedSubgroup.html