Abstract
In this note, we classify all the polarized Fano threefold (X, H) with Bs|H|¬ = ∅. As corollaries we obtained that (1) the very ample part of the conjecture of Fujita holds for smooth Fano threefolds and (2) global Seshadri constants of ample divisors on Fano threefolds are bounded from below by 1 except three types of polarized Fano threefolds.
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