| Abstract: | We examine the evolution and collapse of multiple 30-100 Mpc sized "pancake" and "filament" shaped CDM structures constructed by means of the Szekeres dust models. The dynamics of these structures is equivalent to a fully relativistic generalization of the Zeldovich approximation, thus allowing for a fully relativistic generalization of the Newtonian "spherical" and "elliptic" collapse models used in numerical simulations. The Szekeres multi-structure models are potentially useful in fitting observations whenever a non-perturbative and fully relativistic approach is needed.=
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