GOOD TO KNOW

1. Rings with small clean index (2021).

2. Rings whose idempotents form a subring or an ideal (2021).

3. Strongly $\pi $-regular $2\times 2$ matrices over integral domains (2022).

4. Elementary divisor ring: the definition (2023).

5. The rings all whose isomorphic idempotents are equal (2023).

6. Again on gcd's (2023).

7. A prime connected ring (2023).