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Hypoelliptic ordinary differential operators |
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| Authors: | Yakar Kannai |
| Affiliation: | (1) The Hebrew University of Jerusalem, Israel |
| Abstract: | Necessary and sufficient conditions for the hypoellipticity of an ordinary differential operator withC ∞ coefficients in a neighborhood of a zero of finite order of the leading term are given. A sufficient condition for such an operator to be in a certain Hörmander class is also given. |
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