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- commutative rings (26)
- associative rings (24)
- rings (algebra) (22)
- 现代 (20)
- 长篇小说 (17)
- 英国 (15)
- homology theory (10)
- modules (algebra) (10)
- geometry, algebraic (9)
- group rings (8)
- ideals (algebra) (7)
- 研究 (7)
- categories (mathematics) (5)
- k-theory (5)
- noncommutative rings (5)
- algebra (4)
- algebra, homological (4)
- baggins, frodo (fictitious character) (4)
- group theory (4)
- middle earth (imaginary place) (4)
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