Abstract
In this paper we present a theorem, which is a specific case of a very general problem, that could be described as follows: Given a differentiable manifoldV, “What are the elements of the exterior algebra ofV which describe the topology and differentiable structure ofV?” Classic examples of this situation are: (A) De Rham’s theorems, which describe the cohomology of a manifold by means of closed forms. (B) Reeb’s theorem, which describes the topology of a sphere by means of a function having only two critical points. In the present paper, we prove the following:
Theorem.The projective space Pr3 and the sphere S 3 are the only three-dimensional, compact, manifold which has a contact form with a global expression:\(\omega = f_1 df_2 - f_2 df_1 + f_3 df_4 - f_4 df_3 + f_5 df_6 - f_6 df_5 \) where the f i are global functions satisfying certain integrability conditions.
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C. Godbillon,Géométrie differentielle et mécanique analytique, Hermann, Paris, 1969.
R. Lutz,Sur la géométrie des structures de contact invariantes, Ann. Inst. Fourier29 (1979), 283–306.
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Gonzalo, J., Varela, F. Characterization of the projective space Pr3 by a contact form. Israel J. Math. 53, 346–354 (1986). https://doi.org/10.1007/BF02786566
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DOI: https://doi.org/10.1007/BF02786566