<div class="gmail_quote">Seminario de Probabilidad y Estadística Matemática.<br>
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PROXIMO ENCUENTRO: Miércoles 27 de Julio 12:00hs.<br>
EXPOSITOR: Roberto Fernández, Utrecht University<br>
TITULO: Regular g-measures are not always Gibbsian, parte 2.<br>
LUGAR: Aula de Seminarios del Departamento de Matemática, 2do piso, Pabellón 1.<br>
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RESUMEN: Regular $g$-measures are discrete-time processes determined<br>
by conditional expectations with respect to the past. One-dimensional<br>
Gibbs measures, on the other hand, are fields determined by<br>
simultaneous conditioning on past and future. For the Markovian and<br>
exponentially continuous cases both theories are known to be<br>
equivalent. Its equivalence for more general cases was an open<br>
problem.<br>
We present a simple example settling this issue in a negative way:<br>
there exist $g$-measures that are continuous and non-null but are not<br>
Gibbsian. Our example belongs, in fact, to a well-studied family of<br>
processes with rather nice attributes: It is a chain with<br>
variable-length memory, characterized by the absence of phase<br>
coexistence and the existence of a visible renewal scheme.<br>
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