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References to 'simple ring'
1. idempotent classifications by Algeboy
2. Lie algebras from other algebras by Algeboy
3. maximal ideal by djao
4. radical theory by mclase
5. ring hierarchy by Algeboy
6. semiprimitive ring by yark
7. subdirectly irreducible ring by CWoo
8. Wedderburn-Artin theorem by CWoo