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$\begingroup$ (+) This is an amazing solution. Each step is very clear. This approach can probably be applied to many questions here. It should be added that for general complex $U$ the initial and the final expressions are not equivalent, but that's a different story. $\endgroup$

yarchik
– yarchik

2026-01-30 06:49:27 +00:00
Commented 2 days ago
$\begingroup$ (+1) Great answer. The way you uncover the required algebraic extension and only then factor is particularly elegant. $\endgroup$

E. Chan-López
– E. Chan-López

2026-01-30 16:06:47 +00:00
Commented yesterday

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