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# User:Thomas Wieder

### From OeisWiki

CV: Born 1961 in Germany.

Interests: Counting of hierarchical orderings (e.g. A075729), rankings (e.g. A083355), coalitions (e.g. A131407), multiselections (A188667).

Related publications:

Thomas Wieder: Generation of All Possible Multiselections from a Multiset, Progress in Applied Mathematics 2(1) (2011), 61-66.

Thomas Wieder: The number of certain rankings and hierarchies formed from labeled or unlabeled elements and sets, APPLIED MATHEMATICAL SCIENCES 3(55) (2009), 2707-2724.

Thomas Wieder: The Number Of Certain k-Combinations Of An n-Set, Applied Mathematical E-Notes 8 (2008), 42-52.

N. J. A. Sloane and T. Wieder: The Number of Hierarchical Orderings, Order 21(1) (2004), 83-89.

Websites:

https://sites.google.com/site/twieder21stcenturyad

https://www.researchgate.net/profile/Thomas_Wieder

Links to some of my documents and programs:

Maple program *multichoose* for multiselections from multisets:

Maple program *multiselection* for multiselections from multisets:

Maple program *enum* for generation of integer matrices with given row and column sums:

Fortran program *OPTM0.f95* for for selection of an optimal submultiset from a multiset:

Yet another Maple program for multiselections from multisets (one after the other):