%0 Journal Article %T On the asymptotic measure of periodic subsystems of finite type in symbolic dynamics %A J. -R. Chazottes %A Z. Coelho %A P. Collet %J Mathematics %D 2008 %I arXiv %X Let $\Delta\subsetneq\V$ be a proper subset of the vertices $\V$ of the defining graph of an aperiodic shift of finite type $(\Sigma_{A}^{+},\S)$. Let $\Delta_{n}$ be the union of cylinders in $\Sigma_{A}^{+}$ corresponding to the points $x$ for which the first $n$-symbols of $x$ belong to $\Delta$ and let $\mu$ be an equilibrium state of a H\"older potential $\phi$ on $\Sigma_{A}^{+}$. We know that $\mu(\Delta_{n})$ converges to zero as $n$ diverges. We study the asymptotic behaviour of $\mu(\Delta_{n})$ and compare it with the pressure of the restriction of $\phi$ to $\Sigma_{\Delta}$. The present paper extends some results in \cite{CCC} to the case when $\Sigma_{\Delta}$ is irreducible and periodic. We show an explicit example where the asymptotic behaviour differs from the aperiodic case. %U http://arxiv.org/abs/0804.2551v1