**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).**