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<p>least nine variables. Davenport, Heath-Brown and Hooley all used the <a href="page.php?w=Hardy-Littlewood_circle_method">Hardy-Littlewood circle method</a> in their proofs. According to an idea of <a href="page.php?w=Yuri_Ivanovitch_Manin">Manin</a>, the obstructions to the Hasse principle holding for cubic forms can be tied into the theory of the <a href="page.php?w=Brauer_group">Brauer group</a>; this is the <a href="page.php?w=Brauer-Manin_obstruction">Brauer-Manin obstruction</a>, which accounts completely for the failure of the Hasse principle</p><p>
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