Hello ! I have some troubles understanding the following statement in the proof:

I think I got why the upper block matrix was \( \Sigma \), but it's quite unclear why the off-diagonal block matrices are 0. Thank you very much in advance !

would like to know too :)

## Proof of the SVD lemma

Hello !

I have some troubles understanding the following statement in the proof:

I think I got why the upper block matrix was \( \Sigma \), but it's quite unclear why the off-diagonal block matrices are 0.

Thank you very much in advance !

would like to know too :)

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