Maximal ideals of a quotien ring

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Homework Help Overview

The discussion revolves around proving a statement regarding maximal ideals in the context of quotient rings. Specifically, it examines the relationship between a maximal ideal in a ring and its corresponding ideal in a quotient ring formed by another ideal.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to prove the statement but expresses uncertainty about its validity. They explore the implications of N being maximal in R/I and the relationship to ideals in R.
  • Some participants assert the correctness of the statement and reference the fourth isomorphism theorem as a relevant concept, suggesting its application in the proof.
  • Another participant raises a point about irreducibility in the context of polynomial rings, questioning the field property of a specific quotient.

Discussion Status

The discussion includes various perspectives on the validity of the original statement and the application of the fourth isomorphism theorem. While some participants express confidence in the statement, others introduce additional considerations that may complicate the proof. There is an ongoing exploration of ideas without a clear consensus.

Contextual Notes

Participants are navigating the implications of the fourth isomorphism theorem and its relevance to the proof. There is also a mention of polynomial irreducibility that introduces a potential constraint on the discussion.

R.P.F.
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Homework Statement



I am try to prove :
Let R be a ring, I be a ideal of R.
Then N is a maximal in R/I if and only if N=M/I where M is a maximal ideal in R that contains I.

Homework Equations





The Attempt at a Solution



First I'm not 100% sure that the statement is true, but I'm trying to prove it.
So N is maximal in R/I, then R/I/N is a field which means I/N is maximal in R. This is as far as I get.
Thanks!
 
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This statement is 100% correct. So don't worry about it.

Have you heard of the fourth isomorphism theorem (you probably didn't call it that). It states that there is a bijective correspondance between ideals of R that contain I and ideals of R/I.
In particular, if J is an ideal of R/I, then J=J'/I for some ideal J' of R.

This is the thing you have to use to prove this question. If you didn't see it, then perhaps you could try to prove it...
 
micromass said:
This statement is 100% correct. So don't worry about it.

Have you heard of the fourth isomorphism theorem (you probably didn't call it that). It states that there is a bijective correspondance between ideals of R that contain I and ideals of R/I.
In particular, if J is an ideal of R/I, then J=J'/I for some ideal J' of R.

This is the thing you have to use to prove this question. If you didn't see it, then perhaps you could try to prove it...

Yay I figured it out using your hint! Thanks a lot!
 
Well, x2 isn't an irreducible polynomial of R[x], since x2=x.x
Thus R[x]/(x2) is not a field.
 

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