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  1. ring theory - The subring test (subtraction vs. addition closure ...

  2. abstract algebra - Relationship between subrings and ideals ...

  3. About the definition of subring - Mathematics Stack Exchange

  4. Prove the following is a subring - Mathematics Stack Exchange

  5. abstract algebra - How to check a set of ring is a subring ...

  6. What is the notation for saying $S$ is a subring of $R$?

  7. The Properties of a Subring - Mathematics Stack Exchange

  8. abstract algebra - Ring and Subring with different Identities ...

  9. Show that ideal is a subring - Mathematics Stack Exchange

  10. Describe all subrings of the ring of integers