No small subgroup

In mathematics, especially in topology, a topological group ${\displaystyle G}$ is said to have no small subgroup if there exists a neighborhood ${\displaystyle U}$ of the identity that contains no nontrivial subgroup of ${\displaystyle G.}$ An abbreviation '"NSS"' is sometimes used. A basic example of a topological group with no small subgroup is the general linear group over the complex numbers.

A locally compact, separable metric, locally connected group with no small subgroup is a Lie group. (cf. Hilbert's fifth problem.)

• Hilbert's fifth problem § No small subgroups

• M. Goto, H., Yamabe, On some properties of locally compact groups with no small group

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