Differential geometry is a vast subject that has its roots in both the classical theory of curves and surfaces and in the work of Gauss and Riemann motivated by the calculus of variations. The subjects with strong representation at Cornell are symplectic geometry, Lie theory, and geometric analysis.

Symplectic geometry is a branch of differential geometry and differential topology that has its origins in the Hamiltonian formulation of classical mechanics. Geometric analysis is a mathematical discipline at the interface of differential geometry and differential equations. Richard Hamilton and James Eells Jr. did some of their groundbreaking work while at Cornell.

Lie groups are named after the 19th century mathematician Sophus Lie, who was motivated by the problem of analyzing the continuous symmetries of differential equations. This area has expanded to encompass a wide variety of topics related to finite and continuous groups. It has significant applications to harmonic analysis, number theory, and mathematical physics. One of the most influential mathematicians working in Lie theory in the early 1950s was Eugene Dynkin, a member of the Cornell mathematics department from 1977 to 2014.

H. C. Wang was a member of the department from 1966 to 1978 and made groundbreaking contributions to differential geometry, topology, and Lie groups. The H. C. Wang instructorship is named in his honor. William Thurston, one of the most influential modern geometers was active in the department from 2003 to 2012.

## Field Members

Dan M. Barbasch | Representation theory of reductive Lie groups |

Yuri Berest | Representation theory, noncommutative geometry, mathematical physics |

Xiaodong Cao | Differential geometry and geometric analysis |

Robert Connelly | Discrete geometry, computational geometry and the rigidity of discrete structures |

Tara Holm | Symplectic geometry |

John H. Hubbard | Analysis, differential equations, differential geometry |

Allen Knutson | Algebraic geometry and algebraic combinatorics |

Reyer Sjamaar | Symplectic geometry |

Birgit E. Speh | Lie groups, automorphic forms, representation theory |

Nicolas Templier | Number theory, automorphic forms, and mathematical physics |

Emeritus and Other Faculty

Educational mathematics | |

Brian Hwang | Number theory, representation theory, algebraic geometry |

Liat Kessler | Symplectic geometry: group actions on manifolds, pseudo-holomorphic curves, and model theory. |

Victor Protsak | Algebra, representation theory, and Lie groups |

Xiangdong Yang | Symplectic geometry and complex geometry |