Plünnecke-Ruzsa inequality (source code)

= Plünnecke-Ruzsa inequality
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If finite sets satisfy $|A+B|\leq K|A|$, then the Plünnecke-Ruzsa inequality bounds iterated sumsets and difference sets by
$$
|\ell B-mB|\leq K^{\ell+m}|A|.
$$