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 Apr 17 comment Calculation of a 'double' sum How are you interpreting your bounds on the sums when $\frac{n}{2}$ and $\sqrt{n}$ are not whole numbers? Apr 17 asked Showing existence of a spanning tree in a graph with two kinds of edges using $k$ of one kind of edge Jan 23 accepted Example of a vector norm for which $\|I\|<1$ Nov 1 comment Example of a vector norm for which $\|I\|<1$ @Gortaur I saw your answer, thank you for the effort! Nov 1 comment Example of a vector norm for which $\|I\|<1$ @OlivierBégassat Well I feel only slightly more silly for not seeing this prior, thanks for the hint. Nov 1 asked Example of a vector norm for which $\|I\|<1$ Nov 1 awarded Student Nov 1 awarded Scholar Nov 1 accepted Equivalence of a Vector Norm being Absolute Nov 1 comment Equivalence of a Vector Norm being Absolute That makes sense. The explanation is/was clear, I was just worried about the assumptions made to derive it. Thanks. Nov 1 awarded Supporter Nov 1 comment Equivalence of a Vector Norm being Absolute Doesn't this violate the hypothesis that this must hold for all $\alpha_i$? I read "...for all $x$ and all $y$..." to mean any combination of arbitrary $x$ and $y$ Nov 1 asked Equivalence of a Vector Norm being Absolute