Branch-width, parse trees, and monadic second-order logic for matroids

  • Authors:
  • Petr Hliněný

  • Affiliations:
  • Dept. of Computer Science, V\'v SB--Technical University of Ostrava, Ostrava, Czech Republic and School of Mathematical and Computing Sciences, Victoria University of Wellington, New Zealand

  • Venue:
  • Journal of Combinatorial Theory Series B
  • Year:
  • 2006

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Abstract

We introduce "matroid parse trees" which, using only a limited amount of information at each node, can build up the vector representations of matroids of bounded branch-width over a finite field. We prove that if M is a family of matroids described by a sentence in the monadic second-order logic of matroids, then there is a finite tree automaton accepting exactly those parse trees which build vector representations of the bounded-branch-width representable members of MSince the cycle matroids of graphs are representable over any field, our result directly extends the so called "MS2-theorem" for graphs of bounded tree-width by Courcelle, and others. Moreover, applications and relations in areas other than matroid theory can be found, like for rank-width of graphs, or in the coding theory.