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math.AG2002
Powers of ample divisors and syzygies of projective varieties
Huy Tai Ha
Suppose X is a projective variety, which needs not be smooth, and L an ample divisor on X. We show that there are integers c and b such that for any nonnegative integer p, L^d is n…
math.AG2002
Projective embeddings of projective schemes blown up at subschemes
Huy Tai Ha
Let X be a nonsingular arithmetically Cohen-Macaulay projective scheme, Z a nonsingular subscheme of X. Let π: Y --> X be the blowup of X along the ideal sheaf of Z, E_0 the pull-b…