We give a simple construction of the correspondence between square-zero extensions 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 , , 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 in terms of data purely over R. We show that if R is commutative, then commutative square-zero extensions 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, is the second Witt vectors ring considered as a square-zero extension of R by the Frobenius twist .
Partially supported by the Russian Academic Excellence Project ‘5-100’ and by the Program of the Presidium of the Russian Academy of Sciences N01 “Fundamental Mathematics and its Applications” under grant PRAS-18-01.