can this be true? A ~Trans(A)


by arthurhenry
Tags: similarity, transpose
arthurhenry
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Jun20-11, 12:23 AM
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Is it true that every matrix is similar to its transpose? A claim in Wikipedia...


(field is alg. closed)
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Fredrik
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Jun20-11, 01:21 AM
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Deleted. Funny that I made mistake I've made before.
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Jun20-11, 01:51 AM
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Not every matrix. Only specific types.
I suspect there is a context mentioned?

micromass
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Jun20-11, 08:35 AM
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can this be true? A ~Trans(A)


Whether the base field is algebraically closed doesn't matter here, since two matrices are similar over a small field if and only if they are similar over a bigger field. So the question can always be reduced to an algebraically closed field.

That said, it can be shown that two matrices are similar if and only if the Jordan normal form has the same "invariant factors" and it can be shown that a matrix and it's transpose have the same invariant factors. So a matrix is similar to it's transpose.

Check out the book "matrix analysis" by Horn and Johnson.
arthurhenry
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Jun20-11, 10:27 PM
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I thank you Micromass, that source was very helpful.


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