While studying matrix QR decomposition I've found the following:
I understand the general idea. But, in the Proof, $A = (a_1, ..., a_n)$. What are $a_1, ..., a_n$? They are elements of matrix $A$? Why they are not written as $a_{ij}, ...$?
2026-04-03 19:34:40.1775244880
About QR decomposition
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They are the column vectors of the matrix $A$.