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Make everything roughly the same size
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=== Rough idea of unwritten article === Often it is easier to deal with objects that are roughly the same size. If the range of sizes isn't too great, then we can achieve this by picking a large subset of the objects we have at hand, or partitioning them into not too many sets. For example, if the integers $a_1,\dots,a_m$ all lie between $1$ and $n$, we can partition them into at most $\log_2n$ sets such that any two $a_i$ in the same cell of the partition are within a factor of 2 of each other. This very simple trick is very useful, though it often comes at the expense of [[extra logarithmic factors]] in proofs. It would definitely be good if someone could write this article, and even better if they can think of a good way of classifying the article---it is not altogether obvious how to do so, as the basic idea is used in many different contexts. But how would somebody who needed it stumble on it in the Tricki?
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