 Matrix equivalence

In linear algebra, two rectangular mbyn matrices A and B are called equivalent if
for some invertible nbyn matrix P and some invertible mbym matrix Q. Equivalent matrices represent the same linear transformation V → W under two different choices of a pair of bases of V and W, with P and Q being the change of basis matrices in V and W respectively.
The notion of equivalence should not be confused with that of similarity, which is only defined for square matrices, and is much more restrictive (similar matrices are certainly equivalent, but equivalent square matrices need not be similar). That notion corresponds to matrices representing the same endomorphism V → V under two different choices of a single basis of V, used both for initial vectors and their images.
Properties
Matrix equivalence is an equivalence relation on the space of rectangular matrices.
For two rectangular matrices of the same size, their equivalence can also be characterized by the following conditions
 The matrices can be transformed into one another by a combination of elementary row and column operations.
 The matrices have the same rank.
See also
Categories: Matrices
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