Peter Borg

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A k-signed r-set on [n] = {1, ..., n} is an ordered pair (A, f), where A is an r-subset of [n] and f is a function from A to [k]. Families A 1 , ..., A p are said to be cross-intersecting if any set in any family A i intersects any set in any other family A j. Hilton proved a sharp bound for the sum of sizes of cross-intersecting families of r-subsets of(More)