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Has the trivial answer of n choose 2 when all vectors are zero.

edit approved Aug 11, 2015 at 20:26

Maximal Number of Pairs of Orthogonal vectors in a set of $n$ vectors in $\mathbb{R}^3$

Suppose you are given a set of $n$ non-zero vectors in $\mathbb{R}^3$. What is the maximum number of pairs of them that are orthogonal? The current guess is $\le 2n$.

asked Aug 11, 2015 at 19:46

batconjurer