(Of a group) having members related by a commutative operation (e.g., a×b = b×a).
- In 1925 he proved the Krull-Schmidt theorem for decomposing abelian groups of operators.
- He does provide an example of the decomposition of an abelian group into cosets of a subgroup.
- In the same year he generalised von Neumann's spectral theorem to locally compact abelian groups.
Mid 19th century: named after N. H. Abel (see Abel, Niels Henrik).
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