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Title
On the arithmetic of del Pezzo surfaces of degree 2 The first author was supported by an EPSRC Advanced Research Fellowship. The second author was supported by the NSF grant 0100277..
We study the arithmetic of certain del Pezzo surfaces of degree 2. We produce examples of Brauer-Manin obstruction to the Hasse principle, coming from 2- and 4-torsion elements in the Brauer group.