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The algebra of essential relations on a finite set
The algebra of essential relations on a finite set

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... There is a result6 that limits the hope of finding an explicit noncrossed product example of the form D(x, σ) : If D is a quaternion algebra over a local or global field then any D(x, σ) is a crossed product. With this result in mind, it is clear that even though we do not achieve the smallest possi ...
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... It is natural to ask if Gred is carries a natural group scheme structure over k. In general the answer is no. However, if we assume k is perfect, the answer is yes. Since Gred is reduced, it is smooth (the theorem on connected components), and therefore geometrically reduced (again the theorem). By ...
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Commutative ring

In ring theory, a branch of abstract algebra, a commutative ring is a ring in which the multiplication operation is commutative. The study of commutative rings is called commutative algebra.Some specific kinds of commutative rings are given with the following chain of class inclusions: Commutative rings ⊃ integral domains ⊃ integrally closed domains ⊃ unique factorization domains ⊃ principal ideal domains ⊃ Euclidean domains ⊃ fields ⊃ finite fields
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