Automata, Schreier Graphs and the Wiener Index

  • Stefan Hammer (Speaker)

Activity: Talk or presentationInvited talkScience to science


Automata and graphs are associated in many ways. For invertible automata one can
define the automaton group and observe its action on the set of finite words over the
input alphabet. This leads to the construction of Schreier graphs.
The sum of all distances in a graph, called Wiener index, is a graph property of wide
interest. Harry Wiener showed that the properties of molecules are related to the Wiener
index of chemical structural formulas.
In my talk I will give a basic introduction to automata theory, Schreier graphs and the
Wiener index. I will show some examples of automata and their properties, in particular
the behaviour of the Wiener index on their corresponding Schreier graphs.
Period2 Dec 2019
Held atUniversità degli Studi Niccolò Cusano, Italy


  • Automata
  • Schreier graphs
  • Wiener index

Fields of Expertise

  • Information, Communication & Computing