Geodesic
Derivations of group algebras
Fundamentalʹnaâ i prikladnaâ matematika, Tome 21 (2016) no. 6, pp. 65-78.

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In the paper, a method of describing the outer derivations of the group algebra of a finitely presentable group is given. The description of derivations is given in terms of characters of the groupoid of the adjoint action of the group. 
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A. A. Arutyunov; A. S. Mishchenko; A. I. Shtern. Derivations of group algebras. Fundamentalʹnaâ i prikladnaâ matematika, Tome 21 (2016) no. 6, pp. 65-78. http://geodesic.mathdoc.fr/item/FPM_2016_21_6_a1/

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