2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/171038The aim of this paper is to prove a general version of Plünnecke's inequality. Namely, assume that for finite sets $A$, $B_1, ... B_k$ we have information on the size of the sumsets $A+B_{i_1}+... +B_{i_l}$ for all choices of indices $i_1, ... i_l.$ Then we prove the existence of a non-empty subset $X$ of $A$ such that we have `good control' over the size of the sumset $X+B_1+... +B_k$. As an application of this result we generalize an inequality of \cite{gymr} concerning the submultiplicativity of cardinalities of sumsets.8 pagesCombinatoricsCommutative Algebra11B50; 11B75; 11P70text