Finding the Adjoint of a Matrix

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Homework Help Overview

The discussion revolves around finding the adjoint of a matrix, specifically a 2x2 matrix. Participants are exploring the definitions and methods related to the adjoint and adjugate concepts in linear algebra.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to understand the process of finding the adjoint and expresses confusion about the sign changes involved. Some participants question whether the term "adjoint" is being used correctly, suggesting a distinction between adjoint and adjugate. Others mention the need for the cofactor matrix and express uncertainty about how to derive it.

Discussion Status

The discussion is active, with participants clarifying terminology and exploring different aspects of the problem. Guidance has been offered regarding the distinction between adjoint and adjugate, as well as references to external resources for further information.

Contextual Notes

There appears to be some confusion regarding the definitions of adjoint and adjugate, as well as the process for calculating the cofactor matrix, which may affect the understanding of the problem.

geffman1
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hey guys, just need a little help. say your got a matrix
1 2
3 4

how do you find the adjoint, i can get the right numbers but i can't work out y the signs change. any help would be helpful. thanks guys.
 
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The adjoint is just the transpose, isn't it? Or are you talking about the adjugate? They are different.
 
i think its the transpose of the cofactor matrix
but i don't know how to get the cofactor matrix?? thanks
 
That's actually the adjugate not the adjoint. Try the wikipedia entry http://en.wikipedia.org/wiki/Adjugate It's pretty good and not that hard. You can also look up cofactor matrix from the same source. Also nothing wrong with the entry. You can save me a lot of writing that way.
 

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