2008/02/03 by Carlos Sancho de Salas, de Salas, Carlos Sancho, Fernando Sancho de Salas +1
Mathematics · #14FXX (18E30) #Algebraic Geometry (math.AG) #FOS: Mathematics #math.AG #msc:14FXX
paper · pdf · doi:10.48550/arxiv.0802.0277
This paper has been withdrawn
arxiv created 2008/02/14 · arxiv updated 2009/12/01
This paper has been withdrawn because Proposition 2.2 (c) is false. This invalids the main results of section 2 and 3. We thank A. Canonaco for pointing us the error.