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Real -flats tangent to quadrics in
Author(s):
Frank
Sottile;
Thorsten
Theobald
Journal:
Proc. Amer. Math. Soc.
133
(2005),
2835-2844.
MSC (2000):
Primary 14N10, 51M30, 14P99, 52C45, 05A19
Posted:
April 8, 2005
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Abstract:
Let and denote the dimension and the degree of the Grassmannian , respectively. For each there are (a priori complex) -planes in tangent to general quadratic hypersurfaces in . We show that this class of enumerative problems is fully real, i.e., for there exists a configuration of real quadrics in (affine) real space so that all the mutually tangent -flats are real.
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Additional Information:
Frank
Sottile
Affiliation:
Department of Mathematics, Texas A&M University, College Station, Texas 77843
Email:
sottile@math.tamu.edu
Thorsten
Theobald
Affiliation:
Institut für Mathematik, MA 6-2, Technische Universität Berlin, Strasse des 17. Juni 1936, D-10623 Berlin, Germany
Email:
theobald@math.tu-berlin.de
DOI:
10.1090/S0002-9939-05-07880-9
PII:
S 0002-9939(05)07880-9
Keywords:
Tangents,
transversals,
quadrics,
enumerative geometry,
real solutions,
Grassmannian
Received by editor(s):
March 11, 2004
Received by editor(s) in revised form:
May 25, 2004
Posted:
April 8, 2005
Additional Notes:
The research of the first author was supported by NSF CAREER grant DMS-0070494 and the Clay Mathematical Institute
Communicated by:
Michael Stillman
Copyright of article:
Copyright
2005,
American Mathematical Society
The copyright for this article reverts to public domain after 28 years from publication.
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