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$\Delta=b^2-4ac$$\Delta=b^2-4ac$, by Jean-Pierre Serre (Math. Medley, Singapore Math. Soc. 13, 1985, 1-10).
$\Delta=b^2-4ac$, by Jean-Pierre Serre (Math. Medley, Singapore Math. Soc. 13, 1985, 1-10).
