Combinatorics › Pigeonhole and extremal problems
Subsets avoiding differences
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Coloured beads and balloonsCoprime subsetsDivisibility chainsExtremal countingFamilies of setsForcing a sum conditionGuaranteed minimumMaximum sums in sequencesPairs and the pigeonhole principleParity arrangementsRamsey-type colouringsSmallest sums of sets