Calculating the characteristic of the cartesian product of rings

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Homework Help Overview

The discussion revolves around calculating the characteristic of the Cartesian product of rings, specifically focusing on the characteristics of two rings involved in the problem.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants explore the implications of the multiplicative identities in the rings and question whether the characteristic can be zero based on their observations of ordered pairs. There is also a discussion regarding the characteristic of another ring, with references to the least common multiple of two numbers.

Discussion Status

Some participants have provided insights regarding the characteristics of the rings, with one suggesting that the first ring has zero characteristic and another confirming the characteristic of the second ring as 12. However, there is no explicit consensus on the overall conclusion.

Contextual Notes

Participants are working with specific characteristics of rings and their properties, but the exact details of the rings and any additional constraints are not fully outlined in the discussion.

stripes
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Homework Statement



See attached image
attachment.php?attachmentid=63020&stc=1&d=1381953319.jpg


Homework Equations





The Attempt at a Solution



For the first half of the question, ordered pairs would be (1, [1]), since 1 and [1] are the multiplicative identities in these rings. but no matter how many times we add (1, [1]) to itself, we'll never get (1, [1]) again. does this mean this ring has zero characteristic?
 

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stripes said:

Homework Statement



See attached image
attachment.php?attachmentid=63020&stc=1&d=1381953319.jpg


Homework Equations





The Attempt at a Solution



For the first half of the question, ordered pairs would be (1, [1]), since 1 and [1] are the multiplicative identities in these rings. but no matter how many times we add (1, [1]) to itself, we'll never get (1, [1]) again. does this mean this ring has zero characteristic?

Yes, it has zero characteristic. What about the other ring?
 
Other ring has characteristic 12, I hope.
 
stripes said:
Other ring has characteristic 12, I hope.

Sure it is, it's the least common multiple of 4 and 6.
 

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