Production matrices for geometric graphs

Clemens Huemer, Carlos Seara, Rodrigo I. Silveira, Alexander Pilz

Research output: Contribution to journalArticlepeer-review


We present production matrices for non-crossing geometric graphs on point sets in convex position, which allow us to derive formulas for the numbers of such graphs. Several known identities for Catalan numbers, Ballot numbers, and Fibonacci numbers arise in a natural way, and also new formulas are obtained, such as a formula for the number of non-crossing geometric graphs with root vertex of given degree. The characteristic polynomials of some of these production matrices are also presented. The proofs make use of generating trees and Riordan arrays.

Original languageEnglish
Pages (from-to)301-306
Number of pages6
JournalElectronic Notes in Discrete Mathematics
Publication statusPublished - 1 Oct 2016
Externally publishedYes


  • Catalan number
  • geometric graph
  • production matrix
  • Riordan array

ASJC Scopus subject areas

  • Discrete Mathematics and Combinatorics
  • Applied Mathematics


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