IJPAM: Volume 66, No. 4 (2011)
ON THE
-RANKS OF POINTS ON
(
A CURVE),
THE TANGENT DEVELOPABLE OF
, AND
THE UNIQUENESS OF SETS
COMPUTING
-RANKS



THE TANGENT DEVELOPABLE OF

THE UNIQUENESS OF SETS


E. Ballico
Department of Mathematics
University of Trento
38 123 Povo (Trento) - Via Sommarive, 14, ITALY
e-mail: [email protected]
Department of Mathematics
University of Trento
38 123 Povo (Trento) - Via Sommarive, 14, ITALY
e-mail: [email protected]
Abstract.Let
,
, be an integral projective curve. Let
be the tangent developable of
. For each
let
be the minimal cardinality of a set
spanning
and
the set of all
computing
. Here we give many cases with
and show that if
is smooth, then
for a general
.
Received: October 11, 2010
AMS Subject Classification: 14N05
Key Words and Phrases: ranks, secant variety, tangent developable, tangential projection
Source: International Journal of Pure and Applied Mathematics
ISSN: 1311-8080
Year: 2011
Volume: 66
Issue: 4