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arXiv:math/0204002 [math.AG]AbstractReferencesReviewsResources

Bertini theorems over finite fields

Bjorn Poonen

Published 2002-03-29Version 1

Let X be a smooth quasiprojective subscheme of P^n of dimension m >= 0 over F_q. Then there exist homogeneous polynomials f over F_q for which the intersection of X and the hypersurface f=0 is smooth. In fact, the set of such f has a positive density, equal to zeta_X(m+1)^{-1}, where zeta_X(s)=Z_X(q^{-s}) is the zeta function of X. An analogue for regular quasiprojective schemes over Z is proved, assuming the abc conjecture and another conjecture.

Comments: 22 pages, Latex 2e
Categories: math.AG, math.NT
Subjects: 14J70, 11M38, 11M41, 14G40, 14N05
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