I posted this question over at the QM page,(adsbygoogle = window.adsbygoogle || []).push({});

https://www.physicsforums.com/showthread.php?t=714076

but I realized I am really looking for a

hard Mathematical proof ...

A description of a numerical way of proving this would also be very helpful for me.

or a reference covering the subject.

Many thanks in advance,

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# Can a 2N by 2N matrix written in terms of N by N matrices?

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