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MODEL RELEASED. Henri Poincare (1854-1912), French mathematician. Poincare made contributions to all fields of mathematics and is regarded as one of the greatest mathematicians of all time. His work on the three-body problem (determining the motions of three bodies in space, each influenced by the gravity of the others) laid the foundations for chaos theory. His other works touched on relativity, number theory, electromagnetism and topology. In this last field he posed the Poincare Conjecture, which remained unsolved for nearly 100 years.