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In algebra, a triangular matrix ring, also called a triangular ring, is a ring constructed from two rings and a bimodule.

Definition

If ${\displaystyle T}$ and ${\displaystyle U}$ are rings and ${\displaystyle M}$ is a ${\displaystyle \left(U,T\right)}$-bimodule, then the triangular matrix ring ${\displaystyle R:=\left}$ consists of 2-by-2 matrices of the form ${\displaystyle \left}$, where ${\displaystyle t\in T,m\in M,}$ and ${\displaystyle u\in U,}$ with ordinary matrix addition and matrix multiplication as its operations.

References

• Auslander, Maurice; Reiten, Idun; Smalø, Sverre O. (1997) , Representation theory of Artin algebras, Cambridge Studies in Advanced Mathematics, vol. 36, Cambridge University Press, ISBN 978-0-521-59923-8, MR 1314422

• Ring theory