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Feb 13, 2019 at 18:24 history edited Brian Borchers CC BY-SA 4.0
added 17 characters in body
Feb 13, 2019 at 18:22 comment added Brian Borchers $\| u \|_{2}^{2}+ \| v \|_{2}^{2}=u_{1}^{2} + u_{2}^{2} + \ldots u_{n}^{2} + v_{1}^{2}+\ldots + v_{m}^{2}=\| \left[ \begin{array}{c} u \\ v \end{array} \right] \|_{2}^{2}$.
Feb 13, 2019 at 18:20 comment added Richard Where does $\| u \|_{2}^{2} + \| v \|_{2}^{2}= \left[ \begin{array}{c} u \\ v \end{array} \right]_{2}^{2}$ come from?
Feb 12, 2019 at 3:00 vote accept yohbs
Feb 11, 2019 at 23:44 history answered Brian Borchers CC BY-SA 4.0