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The article summoned Riemannian manifolds, (general) Lie groups, quaternions, Lorentz transformations, biquaternions and other hypercomplex numbers, and even G2. The only silly forgotten beast is the Euclidean group. Incnis Mrsi (talk) 19:07, 15 January 2014 (UTC)[reply]
The Euclidean group is now included. Your observations have been of considerable value to the project.Rgdboer (talk) 21:31, 23 August 2014 (UTC)[reply]