In algebra, given an algebraic group G, a G-module M and a G-algebra A, all over a field k, the module of covariants of type M is the A G {\displaystyle A^{G}} -module
( M ⊗ k A ) G . {\displaystyle (M\otimes _{k}A)^{G}.}where − G {\displaystyle -^{G}} refers to taking the elements fixed by the action of G; thus, A G {\displaystyle A^{G}} is the ring of invariants of A.
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See also
- M. Brion, Sur les modules de covariants, Ann. Sci. École Norm. Sup. (4) 26 (1993), 1 21.
- M. Van den Bergh, Modules of covariants, Proceedings of the International Congress of Mathematicians, Vol. 1, 2 (Zurich, 1994), Birkhauser, Basel, pp. 352–362, 1995.