6-972s06-th.jpg

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Discriminant for a fourth-order polynomial. Inside region is nonnegative.
Caption:
The discriminant of the polynomial x_4 + 4_ax_3 + 6_b_x_2 + 4_cx_ + 1. The convex set inside the “bowl” corresponds to the region of nonnegativity. There is an additional one-dimensional component inside the set. (Image courtesy of Prof. Pablo Parrilo.)
Discriminant for a fourth-order polynomial. Inside region is nonnegative.

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Spring 2006
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