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Book: Objects

I want to list and generate the basic combinatorial objects.

Stanley Enumerative Combinatorics

The Twelvefold Way f:N->X two sets

And regarding the elements of N and X as "distinguishable" or "indistinguishable".

{$(x)_{n}=x(x-1)(x-2)...(x-n+1)$}

{$S(n,k)$} is the number of partitions of an n-set into k-blocks. It is called a Stirling number of the second kind.

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Puslapis paskutinį kartą pakeistas 2018 sausio 07 d., 18:57