Second Law in Classical Non-Extensive Systems

Equilibrium statistics of Hamiltonian systems is correctly described by the microcanonical ensemble, whereas canonical ones fail in the most interesting, mostly inhomogeneous, situations like phase separations or away from the thermodynamic ``limit'' (e.g. self-gravitating systems and small quantum systems). A new derivation of the Second Law is presented that respects these fundamental complications. Our ``geometric foundation of Thermo-Statistics'' opens the fundamental (axiomatic) application of Thermo-Statistics to non-diluted systems or to ``non-simple'' systems which are not similar to (homogeneous) fluids. Supprisingly, but also understandably, a so far open problem c.f. Uffink: cond-mat/0005327, page 50 and page 72.