Abstract
We give an example of a clean ring R and an idempotent e ∈ R, such that the corner ring eRe is not clean.
2000 Mathematics Subject Classification:
ACKNOWLEDGMENT
I would like to thank professor Matja Omladi
for his help and encouragement with this work. I would also like to thank Slovenian Research Agency for financial support.
Notes
Communicated by I. Swanson.