On pairs of subrings with a common set of proper ideals.
On ...-regular rings with no infinite trivial subring.
On non singular p-inyective rings.
A ring R is said to be if, for any principal left ideal I of R, any left R-homomorphism I into R extends to one of R into itself. In this note left nonsingular left p-injective rings are characterized using their maximal left rings of quotients and the structure of semiprime left p-injective rings of bounded index is investigated.
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