Do Matrix Inverses Commute When Flanking Another Matrix?

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SUMMARY

The discussion centers on the commutativity of matrix inverses when flanking another matrix. It is established that while a matrix and its inverse commute with each other, the expression E*A*E^(-1) does not equal E^(-1)*A*E in general. This indicates that the relationship between a matrix and its inverse is not commutative when another matrix is involved. The conclusion emphasizes that this non-commutativity is crucial for understanding coordinate transformations.

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  • Understanding of matrix operations, specifically matrix multiplication.
  • Familiarity with the concept of matrix inverses.
  • Knowledge of coordinate transformations in linear algebra.
  • Basic proficiency in mathematical notation and terminology.
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  • Research the properties of matrix multiplication and non-commutativity.
  • Study the implications of matrix inverses in linear transformations.
  • Explore coordinate transformations and their mathematical representations.
  • Learn about specific examples where matrix inverses do not commute with other matrices.
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Mathematicians, students of linear algebra, and anyone involved in advanced mathematical modeling or transformations will benefit from this discussion.

Woolyabyss
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I know that matrix and its inverse are commutative i.e. E*E^(-1) = E^(-1)*E

but is a matrix and its inverse at either side of another matrix commutative?
E*A*E^(-1) = E^(-1)*A*E

Any help would be appreciated.
 
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Not in general.
Otherwise every coordinate transformation would be equivalent to its inverse transformation.
 
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