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- commutative rings (9)
- associative rings (7)
- rings (algebra) (7)
- homology theory (3)
- noncommutative rings (3)
- categories (mathematics) (2)
- modules (algebra) (2)
- representations of groups (2)
- ring extensions (algebra) (2)
- sheaf theory (2)
- symmetry groups (2)
- 研究 (2)
- abelian categories (1)
- addresses, essays, lectures (1)
- approximation theory (1)
- arithmetical algebraic geometry (1)
- associative algebras (1)
- brauer group (1)
- dimension theory (algebra) (1)
- dimension theory (topology) (1)
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