A Duality Result for Moduli Spaces of Semistable Sheaves Supported on Projective Curves

We show that the moduli space M(r,c) of semistable sheaves on n-dimensional projective space with support of dimension one, with multiplicity r and with Euler characteristic c is isomorphic to M(r,-c).Comment: In the second version we rewrite the proofs in the language of spectral sequences. The main results are unchanged. To appear in the Mathematical Journal of the University of Padu

Relative Hilbert schemes and moduli spaces of torsion plane sheaves

We find certain relations between flag Hilbert schemes of points on plane curves and moduli spaces of one-dimensional plane sheaves. We show that some of these moduli spaces are unirational