### Abstract

I investigate some aspects of the geometry of the bicharacteristics of a class of hypoelliptic second order partial differential operators. The resulting geometry looks quite a bit like Riemannian geometry, although with interesting differences.

Original language | English (US) |
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Pages (from-to) | 355-378 |

Number of pages | 24 |

Journal | Pacific Journal of Mathematics |

Volume | 136 |

Issue number | 2 |

State | Published - 1989 |

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### ASJC Scopus subject areas

- Mathematics(all)