2 papers
math.AG2008
A lower bound on Seshadri constants of hyperplane bundles on threefolds
Kungho Chan
We give the lower bound on Seshadri constants for the case of very ample line bundles on threefolds. We consider the situation when the Seshadri constant is strictly less than 2 an…
math.AG2008
A characterization of double covers of curves in terms of the ample cone of second symmetric product
Kungho Chan
We investigate the nef cone spanned by the diagonal and the fibre classes of second symmetric product of a curve of genus . This 2-dimensional nef cone gives a characterization…