We revisist the issue of entanglement of thermal equilibrium states in composite quantum systems. The possible scenarios are exemplified in bipartite qubit/qubit and qubit/qutrit systems.
@article{arxiv.quant-ph/0507013,
title = {Entanglement in thermal equilibrium states},
author = {O. Osenda and G. A. Raggio},
journal= {arXiv preprint arXiv:quant-ph/0507013},
year = {2009}
}