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HYPOELLIPTICITY OF NONSINGULAR CLOSED 1-FORMS ON COMPACT MANIFOLDS |
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| Abstract: | ABSTRACT Hypoellipticity of nonsingular closed 1-forms on compact manifolds is characterized by a diophantine condition on the generators of the group of periods of the form. |
| Keywords: | Closed 1-forms Groups of periods Hypoellipticity Liouville numbers |