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