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Search: MSC category 15A33 ( Matrices over special rings (quaternions, finite fields, etc.) )

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1. CMB 2010 (vol 54 pp. 237)

Creedon, Leo; Gildea, Joe
 The Structure of the Unit Group of the Group Algebra ${\mathbb{F}}_{2^k}D_{8}$ Let $RG$ denote the group ring of the group $G$ over the ring $R$. Using an isomorphism between $RG$ and a certain ring of $n \times n$ matrices in conjunction with other techniques, the structure of the unit group of the group algebra of the dihedral group of order $8$ over any finite field of chracteristic $2$ is determined in terms of split extensions of cyclic groups. Categories:16U60, 16S34, 20C05, 15A33

2. CMB 1998 (vol 41 pp. 105)

So, Wasin
 An explicit criterion for the convexity of quaternionic numerical range Quaternionic numerical range is not always a convex set. In this note, an explicit criterion is given for the convexity of quaternionic numerical range. Categories:15A33, 15A60
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