A note on CSP rings

Anahtar Kelimeler:

CSP rings, CS rings, SSP rings, Self-injective rings, Regular rings

A note on CSP rings

A ring $R$ is called right CSP if the sum of any two closed right ideals of $R$ is also a closed right ideal of $R$. Left CSP rings can be defined similarly. An example is given to show that a left CSP ring may not be right CSP. It is shown that a matrix ring over a right CSP ring may not be right CSP. It is proved that $\mathbb{M}_{2}(R)$ is right CSP if and only if $R$ is right self-injective and von Neumann regular. The equivalent characterization is given for the trivial extension $R\propto R$ of $R$ to be right CSP.

Keywords:

CSP rings, CS rings, SSP rings, self-injective rings, regular rings,

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