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Sep 7, 2023 at 14:24 history edited Mikael de la Salle CC BY-SA 4.0
Changed \Big to \big, as suggested by @LSpice, and corrected the column norm to row norm.
Sep 7, 2023 at 3:16 comment added Mikael de la Salle Not really, you are probably right.
Sep 6, 2023 at 21:52 comment added LSpice Did you mean for your $\Big\| \begin{pmatrix} a & b \end{pmatrix}\Big\|$ to be so \Big (as opposed to, say, $\bigl\lVert(a\ b)\bigr\rVert$ \bigl\lVert\(a\ b)\bigr\rVert)?
Sep 6, 2023 at 21:42 vote accept P. P. Tuong
Sep 6, 2023 at 19:15 history answered Mikael de la Salle CC BY-SA 4.0