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Originally Posted by soso123 Please define your terms.

R is a ring with 1 and M is a left R-module.

Originally Posted by soso123 R is a ring with 1 and M is a left R-module. Thank you for the reply. Defining all terms is a good habit to have. What do you know about $\displaystyle s\cdot 0~?$ Please show some of your own work.