2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/18522We show an attempt to establish the zeroth law of thermodynamics within the framework of nonextensive statistical mechanics based on the classic normalization $\texttt{Tr}\hatρ=1$ and the unnormalized expectation $x=\texttt{Tr}\hatρ^q\hat{x}$. The first law of thermodynamics and the definition of heat and work in this formalism are discussed.6 pages, no figure, RevTeX. To appear in Chaos, Solitons & Fractals (2002)Statistical Mechanicstext