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For questions involving cubes in higher dimensions or the hypercube graphs.
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answer
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A question of Ahlswede and Katona: known lower bounds on $\beta(d,n)$?
Given a set $S\subseteq \{0,1\}^d$ of the Boolean hypercube of dimension $d$, define the average distance of $S$ as
$$
\bar{d}(S) = \frac{1}{\lvert S\rvert^2} \sum_{x,y\in S} d_H(x,y)\tag{1}
$$
where $ …