Cotorsion pairs and approximation classes over formal triangular matrix rings
L Mao - Journal of Pure and Applied Algebra, 2020 - Elsevier
Abstract Let T=(A 0 UB) be a formal triangular matrix ring, where A and B are rings and U is
a (B, A)-bimodule. Let C 1 and C 2 be two classes of left A-modules, D 1 and D 2 be two …
a (B, A)-bimodule. Let C 1 and C 2 be two classes of left A-modules, D 1 and D 2 be two …