KSubsets

The k-element subsets of in COLEXICOGRAPHIC order (the combinations) — the order the combinatorial number system ranks them in.

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KSubsets(n, k)the subsets of size

Domain: Combinatorial collections

Details

Count is the binomial coefficient
Elements are the k-combinations in COLEXICOGRAPHIC order: compare the largest element first, so precedes
That is the order IntegerDigits with `CombinatorialSystem(k)` unranks in — the two are the same map
gives the single empty subset; gives an empty family

Examples

See also: Subsets, Multisets, Binomial