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Subdiagrams and invariant measures on Bratteli diagrams

Published online by Cambridge University Press:  12 May 2016

M. ADAMSKA
Affiliation:
The University of Warmia and Mazury, Olsztyn, Poland email malwina.adamska@gmail.com
S. BEZUGLYI
Affiliation:
Department of Mathematics, Institute for Low Temperature Physics, Kharkiv, Ukraine email bezuglyi@gmail.com, helen.karpel@gmail.comDepartment of Mathematics, University of Iowa, Iowa City, 52242 IA, USA
O. KARPEL
Affiliation:
Department of Mathematics, Institute for Low Temperature Physics, Kharkiv, Ukraine email bezuglyi@gmail.com, helen.karpel@gmail.comDepartment of Dynamical Systems, Institute of Mathematics of the Polish Academy of Sciences, Warsaw, Poland
J. KWIATKOWSKI
Affiliation:
Kotarbinski University of Information Technology and Management, Olsztyn, Poland email jkwiat@mat.umk.pl
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Abstract

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We study ergodic finite and infinite measures defined on the path space $X_{B}$ of a Bratteli diagram $B$ which are invariant with respect to the tail equivalence relation on $X_{B}$ . Our interest is focused on measures supported by vertex and edge subdiagrams of $B$ . We give several criteria when a finite invariant measure defined on the path space of a subdiagram of $B$ extends to a finite invariant measure on $B$ . Given a finite ergodic measure on a Bratteli diagram $B$ and a subdiagram $B^{\prime }$ of $B$ , we find the necessary and sufficient conditions under which the measure of the path space $X_{B^{\prime }}$ of $B^{\prime }$ is positive. For a class of Bratteli diagrams of finite rank, we determine when they have maximal possible number of ergodic invariant measures. The case of diagrams of rank two is completely studied. We also include an example which explicitly illustrates the proven results.

Information

Type
Research Article
Copyright
© Cambridge University Press, 2016