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EUROPEAN PHYSICAL JOURNAL B, vol.1, no.1, pp.111-116, 1998 (Journal Indexed in SCI)
A kinetics built upon q-calculus, the calculus of discrete dilatations, is shown to describe diffusion on a hierarchical lattice. The only observable on this ultrametric space is the "quasi-position" whose eigenvalues are the le levels of the hierarchy, corresponding to the volume of phase space available to the system at any given time. Motion along the lattice of quasi-positions is irreversible.