Abstract
Abstract Let 𝐴 and 𝐵 be rings and 𝑈 a ( B , A ) (B,A) -bimodule. The Gorenstein projective, injective and flat complexes over the formal triangular matrix ring T = ( A 0 U B ) T=\bigl{(}\!\begin{smallmatrix}A&0\\ U&B\end{smallmatrix}\!\bigr{)} are explicitly described. These statements extend some earlier results of Enochs, Cortés-Izurdiaga, Torrecillas, Zhang and Mao in this direction.
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