Lecture Series by Gary Jensen (Washington University)"Rigidity of hypersurfaces in complex projective space"
Date: October 14, 15, 16 and 19, 2015
Place: Room 1114(International Conference Room), KIAS
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Lecture Series by Gary Jensen (Washington University)
"Rigidity of hypersurfaces in complex projective space"
Time: 11:00-12:00, 13:30-14:30 on October 14, 15, 16 and 19, 2015
Place: Room 1114(International Conference Room), KIAS
Abstract: In a series of papers dating from 1916, G. Fubini studied the
deformation of hypersurfaces in complex projective space. His notion of
deformation generalized Gauss's notion of applicability of surfaces in
Euclidean space. He introduced a holomorphic quadric form and a
holomorphic cubic form on a hypersurface, which is called non-degenerate
if the quadratic form has maximal rank. He showed that if a non-degenerate
hypersurface has a deformation, then the ratio of the cubic to the
quadratic forms is the same on the two hypersurfaces. He proved the
converse for surfaces, but for hypersurfaces of dimension greater than
two, the converse remained open for many decades. Using Cartan's method
of moving frames, we will present the details of a proof that for a pair
of non-degenerate hypersurfaces of dimension greater than two, if the
ratio of the cubic to quadratic forms is the same for both, then the
hypersurfaces are congruent by a projective transformation.