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      Questions tagged [local-rings]

      The tag has no usage guidance.

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      Power series ring $R[[X_1,\ldots,X_d]]$ over a U.F.D. $R$

      Let $R$ be a U.F.D. and \begin{align*} T \,\colon= R[[X_1,\ldots,X_d]]. \end{align*} Suppose that we have $d$ elements $f_1,\ldots,f_d \in T$ and let us consider an ideal $J$ of $T$ such that $(f_1,\...
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      The Zariski Riemann Space, but with Local Rings

      The Zariski Riemann space, while an abandoned approach, has lead to later developments and generalizations, including $\text{Spv}$ (the space of valuations) and Huber's work. In studying it, I would ...
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      The algebraic variety behind a quotient of the ring of regular functions on the complex torus [on hold]

      I am trying to understand what algebraic variety stands behind the following quotient. Let $I$ be the vanishing ideal of some linear subspace $\mathbb{C}^k \subset \mathbb{C}^n$ in the standard ...
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      155 views

      Primes of the power series rings

      Let $A_n \colon= K[[X_1,\ldots,X_n]]$ be a $n$-variable formal power series ring. By setting $X_n \mapsto 0$, we obtain a natural surjection \begin{equation*} \psi_{n,n-1} \colon A_n \...
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      63 views

      Relation between lifts of simple roots and lifts of idempotents (Henselian property)

      Let $f:A\to B$ be a morphism of commutative rings. Given a monic $\varphi\in A[x]$ write $Z(A,\varphi)$ for the set of simple roots of $\varphi$ in $A$. Consider the following properties of $f:A\to B$....
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      1answer
      131 views

      commutative ring satisfying descending chain condition on radical ideals

      Let $R$ be a commutative ring with unity which satisfies d.c.c. on radical ideals. then does $R$ satisfy a.c.c. on radical ideals ? If this is not true in general, then what happens if we also assume $...
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      Under which conditions on the homogeneous ideal $ I $, the quotient ring $ \mathbb{C} [X_0, \dots, X_n]/I $ is a regular ring?

      If $ I $ is a homogeneous ideal of the ring of homogeneous polynomials $ \mathbb {C} [X_0, \dots, X_n] $ , under which conditions on the homogeneous ideal $ I $, and particularly on $ I_m $, the $m$ -...
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      214 views

      Minimal resolution of local cohomology module

      Let $(R,\mathfrak m)$ be a Noetherian local ring of dimension $d\geq 1.$ Suppose $\lambda(H_{\mathfrak m}^i(R))<\infty$ for some $0\leq i\leq d-1.$ Question Can we say anything about Betti numbers ...
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      143 views

      Bezout theorem for germs of holomorphic functions

      UPDATE. It was pointed out by @Dmitri that two smooth curves given by $f=y$ and $g=y+x^k$ in $\mathbb C^2$ provide a simple counterexample. Let $f_1, \ldots, f_p, g_1, \ldots, g_q$ be germs of ...
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      360 views

      Reduced ring with all non-prime ideals finitely generated

      Let $R$ be a reduced ring with all non-prime ideals finitely generated. Then is $R$ Noetherian ? If not, then is it true at least in the local case ? Without reduced assumption, it is not true even ...
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      328 views

      Rings with all non-prime ideals finitely generated

      Motivated by this question, I would like to ask: If all non-prime ideals in a ring are finitely generated, then is the ring Noetherian? Can we at least say anything in the local case? Note that ...
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      1answer
      648 views

      local ring all whose non-maximal ideals are finitely generated

      Let $(R, \mathfrak m)$ be a commutative local ring such that every non-maximal ideal is finitely generated. Then, is $R$ Noetherian i.e. is $\mathfrak m$ finitely generated ideal ? It is easy to see ...
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      1answer
      143 views

      Valuation ring whose maximal ideal and every ideal of finite height are principal

      Let $(R, \mathfrak m)$ be a valuation ring such that $\mathfrak m$ and every ideal of finite height is principal. Then is $R$ Noetherian , i.e. a discrete valuation ring ?
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      117 views

      When is a zero dimensional local ring a chain ring?

      A commutative ring with identity is called a chain ring if all its ideals form a chain under inclusion. I want to know is there any proof for the fact that a zero dimensional local ring is a chain ...
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      110 views

      Is a filtered colimit of complete module complete?

      This is probably a textbook question but i haven't been able to find a reference. Let $R$ be a complete commutative Noetherian local ring and $I$ its unique maximal ideal (I'm mostly interested in the ...

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