Morphismes quadratiques entre modules sur un anneau carré

Details Morphismes quadratiques entre modules sur un anneau carré Morphismes quadratiques entre modules sur un anneau carré

2010-01-16

arxiv.org/abs/1001.2849v1

Mathematics

Rings and Algebras

21 pages

Scientific paper

We introduce the notions of a commutative square ring $R$ and of a quadratic map between modules over $R$, called $R$-quadratic map. This notion generalizes various notions of quadratic maps between algebraic objects in the literature. We construct a category of quadratic maps between $R$-modules and show that it is a right-quadratic category and has an internal Hom-functor. Along our way, we recall the notions of a general square ring $R$ and of a module over $R$, and discuss their elementary properties in some detail, adopting an operadic point of view. In particular, it turns out that the associated graded object of a square ring $R$ is a nilpotent operad of class 2, and the associated graded object of an $R$-module is an algebra over this operad, in a functorial way. This generalizes the well-known relation between groups and graded Lie algebras (in the case of nilpotency class 2). We also generalize some elementary notions from group theory to modules over square rings.

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