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Nov 10, 2011 at 20:38 comment added Alain Valette Try googling for "crossed products" ($R_{\mathbb{Q}(P\rtimes C)$ is a crossed product of $R_{\mathbb{Q}(P)$ by $C$).
Nov 10, 2011 at 15:24 history asked Dimitrios CC BY-SA 3.0