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The Bianchi Ix (MIXMASTER) Cosmological Model is Not Integrable

A. Latifi, M. Musette, R. Conte

chao-dynarXiv:chao-dyn/9409002

Abstract

The perturbation of an exact solution exhibits a movable transcendental essential singularity, thus proving the nonintegrability. Then, all possible exact particular solutions which may be written in closed form are isolated with the perturbative Painlevé test; this proves the inexistence of any vacuum solution other than the three known ones.

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