Positive operator valued measures covariant with respect to an Abelian group
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Given a unitary representation $U$ of an Abelian group $G$ and a subgroup $H$, we characterise the positive operator valued quotient group $G/H$ and covariant with respect to $U$.
17 pages (latex2e with amsart.cls and amsmath package)
17 pages (latex2e with amsart.cls and amsmath package)