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INTEGRAL DOMAINS OF FINITE t-CHARACTER Introduction An
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... if every nonzero nonunit of D belongs to at most a finite number of maximal ideals (resp., maximal t-ideals). It is well known that integral domains in which each tideal is a v-ideal (e.g., Noetherian, Mori, or Krull domains) are of finite t-character [26, Theorem 1.3]. Also, if D is of finite t-cha ...
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... metric. This automatically gives R[[X]] the structure of a topological ring (and even of a complete metric space). But the general construction of a completion of a metric space is more involved than what is needed here, and would make formal power series seem more complicated than they are. It is p ...
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... commutative S-algebra, and M and N are R-algebras. Recall that if k is an S-algebra, an k-algebra R is called q-cofibrant if the unit map k → R is a cofibration in the Quillen model category of kalgebras (see section VII.4 of [EKMM]); similarly R is called a q-cofibrant commutative k-algebra if its ...
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... by an associative ring using the rule (2.2). In particular [l, Theorem 3], the free Lie ring generated by xi, ■ • ■ , xq is faithfully represented by the free associative ring generated by In the free associative ring a monomial is determined by the order of its factors, since all possible ways of i ...
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... 4. Consider R as a module over itself. Prove that a singleton set {x} is linearly independent if and only if x is not a zero divisor in R. 5. State and prove the fundamental homomorphism theorems for modules. We shall now illustrate several basic results on vector spaces that fail for modules over c ...
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... the shift operator. If proj A has a dualizing sheaf ω 0 , then, for each i, there is a natural transformation θi : Extiqgr A (−, ω 0 ) −→ Hd−i (X, −)∗ . Under some hypotheses Theorem 2.3 gives a sufficient and necessary condition for a dualizing sheaf to exist. Namely, to show the existence of a dua ...
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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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