ELEMENTARY

 

1. Equivalent definitions and generalizations for algebraic lattices (2012).

2. Some self-dual notions for groups (2012-13).

3. Subrings of matrix rings (2014-15).

4. Units and nilpotent elements in corners (2015).

5. A false problem (2016).

6. 2 x 2 unipotent matrices (2017).

7. Traces of powers of 2 x 2 matrices (2017).

8. Different row rank and column rank for a matrix (2017).

9. A characterization of Dedekind finite rings (2017).

10. Idempotent reversible rings (2017).

11. Abelian groups whose subgroups are endomorphic kernels (2018).

12. Very strongly clean rings (2018).

13. A fine element which is not exchange (2019).

14. Units generated by idempotents (2019).

15. Equivalent idempotents are conjugate in any ring (2019).

16. Exercise in Fuchs 1973 and 2015 (2019).

17. "Everything" lifts modulo nil ideals (2020).

18. GreatestCommonDivisor domains (corrected) (2020).

19. Equivalent nilpotents may not be conjugate (2020).

20. Matrices similar to transposes (2020).

21. Zero determinants revisited (2020).

22. Von Neumann regular matrices of small sizes over integral domains (2020).