Which Matrices Satisfy AB=BA for A=[1 0; 1 1]?

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The discussion focuses on finding matrices B that satisfy the equation AB=BA for the given matrix A=[1 0; 1 1]. Participants suggest expressing B in the form B=[a b; c d] and multiplying both sides of the equation to derive constraints on the variables a, b, c, and d. The use of the inverse of matrix A is also mentioned as a potential method to simplify the problem. Ultimately, the key approach is to explicitly calculate AB and BA to identify the necessary conditions for commutativity.

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gunnar
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I would appreciate if someone could help me with this one.

Matrix A=[1 0 ; 1 1]
I need to find all matrices that satisfy: AB=BA
How can I find them?
PLease help :cry:
 
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Try writing
B=\left(\begin{array}{cc}a & b \\ c&d \end{array}\right)

and check what the constraints on a,b,c and d are.
 
did that. And put A(inverse)* [a b;c d] = C*A(inverse)
 
What does the inverse have to do with everything...?

Daniel.
 
yea, just write out AB=BA using B=[a,b;c,d] and A=[1,0;1,1]
and multiply out both sides.
 

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