Imagine I have an arbitrary vector v in RR^n and say it can be represented as v=(v_1,...,v_n)^T where it's understood that the indexes are in increasing order. Imagine now the vector u in RR^(n-1) obtained by simply removing entry with index i of v. What's the best (and most "economic") way to represent such vector? My idea was to simply interpret the vector as a sequence and write u={v_j}_(j != i)^T but I'm not sure whether this is correct and/or there is a better way of writing it. Any ideas?

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$$\left[\begin{array}{cccc}1& 3& 0& -4\\ 2& 6& 0& -8\end{array}\right]$$

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b) ${\displaystyle f\left(n\right)=\sqrt{n^2+1}}$. 
c) ${\displaystyle f\left(n\right)=\frac{1}{n^2-4}}$.

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