Modules and Kronecker Extensions
Günter Scheja, Uwe Storch · 2001
As in the previous section A always denotes a commutative ring. We denote by U i , i ∈ I , a given system of indeterminates, by A ( U ) the corresponding Kronecker extension and by V ( U ) the extended module A ( U ) ⊗ a V of an A-module V.