Some combinatorial properties of fixed boundary rhombus random tilings with octagonal symmetry are studied. A geometrical analysis of their configuration space is given as well as a description in terms of discrete dynamical systems, thus generalizing previous results on the more restricted class of codimension-one tilings. In particular this method gives access ro counting formulas, which are directly related to questions of entropy in these statistical systems. Methods and tools From the field of enumerative combinatorics are used. [References: 48]
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