Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8905063 | Advances in Mathematics | 2018 | 59 Pages |
Abstract
We give a simple construction of the correspondence between square-zero extensions Râ² of a ring R by an R-bimodule M and second MacLane cohomology classes of R with coefficients in M (the simplest non-trivial case of the construction is R=M=Z/p, Râ²=Z/p2, thus the Bokstein homomorphism of the title). Following Jibladze and Pirashvili, we treat MacLane cohomology as cohomology of non-additive endofunctors of the category of projective R-modules. We explain how to describe liftings of R-modules and complexes of R-modules to Râ² in terms of data purely over R. We show that if R is commutative, then commutative square-zero extensions Râ² correspond to multiplicative extensions of endofunctors. We then explore in detail one particular multiplicative non-additive endofunctor constructed from cyclic powers of a module V over a commutative ring R annihilated by a prime p. In this case, Râ² is the second Witt vectors ring W2(R) considered as a square-zero extension of R by the Frobenius twist R(1).
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Physical Sciences and Engineering
Mathematics
Mathematics (General)
Authors
D. Kaledin,