Geodesic
On the Wilson monoid of a pairwise balanced design
Margolis, Stuart1 ; Rhodes, John2 ; Silva, Pedro V.3
1 Department of Mathematics Bar Ilan University 52900 Ramat Gan, Israel
2 Department of Mathematics University of California Berkeley California 94720, U.S.A.
3 Centro de Matemática Faculdade de Ciências Universidade do Porto R. Campo Alegre 687 4169-007 Porto, Portugal
Algebraic Combinatorics, Tome 3 (2020) no. 3, pp. 637-665

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We give a new perspective of the relationship between simple matroids of rank 3 and pairwise balanced designs, connecting Wilson’s theorems and tools with the theory of truncated boolean representable simplicial complexes. We also introduce the concept of Wilson monoid W(X) of a pairwise balanced design X. We present some general algebraic properties and study in detail the cases of Steiner triple systems up to 19 points, as well as the case where a single block has more than 2 elements.

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DOI : 10.5802/alco.106
Classification : 05B05, 05B07, 05B35, 05E45, 14F35, 20M10
Keywords: Matroid, boolean representable simplicial complex, truncation, pairwise balanced design, Wilson monoid.

Margolis, Stuart 1 ; Rhodes, John 2 ; Silva, Pedro V. 3

1 Department of Mathematics Bar Ilan University 52900 Ramat Gan, Israel
2 Department of Mathematics University of California Berkeley California 94720, U.S.A.
3 Centro de Matemática Faculdade de Ciências Universidade do Porto R. Campo Alegre 687 4169-007 Porto, Portugal
Licence : CC-BY 4.0
Droits d'auteur : Les auteurs conservent leurs droits 
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     title = {On the {Wilson} monoid of a pairwise balanced design},
     journal = {Algebraic Combinatorics},
     pages = {637--665},
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Margolis, Stuart; Rhodes, John; Silva, Pedro V. On the Wilson monoid of a pairwise balanced design. Algebraic Combinatorics, Tome 3 (2020) no. 3, pp. 637-665. doi: 10.5802/alco.106

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