Let $S$ be von Neumann regular which has an ideal $I$ which is not a direct summand of $S_S$. Let $R$ be $S/I$. Form the triangular ring $T=\begin{bmatrix}R&R\\ 0& S\end{bmatrix}$. $T$ is the ring. For concreteness, we pick $S=\prod_{i=1}^\infty F_2$, and $I$ a maximal essential ideal.

Keywords quotient ring triangular ring

- T.-Y. Lam. Lectures on modules and rings. (2012) @ pp 47-48

Symmetric properties

Asymmetric properties

Legend

- = has the property
- = does not have the property
- = information not in database

Name | Measure | |
---|---|---|

cardinality | $\mathfrak c$ | |

composition length | left: $\infty$ | right: $\infty$ |

Krull dimension (classical) | 0 |

Name | Description |
---|---|

Left singular ideal | $\{0\}$ |