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math.AC2013
Nil-clean matrix rings
S. Breaz, G. Călugăreanu, P. Danchev +1
We characterize the nil clean matrix rings over fields. As a by product, it is proved that the full matrix rings with coefficients in commutative nil-clean rings are nil-clean, and…
math.AC2013
Subgroups which admit extensions of homomorphisms
Simion Breaz, Grigore Călugăreanu, Phill Schultz
We classify by numerical invariants the finite subgroups of a primary abelian group for which every homomorphism or monomorphism of into , or every endomorphism of $…