Gauss–Lucas theorem

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What Wikipedia says

In complex analysis, a branch of mathematics, the Gauss–Lucas theorem gives a geometric relation between the roots of a polynomial P and the roots of its derivative P′. The set of roots of a real or complex polynomial is a set of points in the complex plane.

Excerpt from the Wikipedia article “Gauss–Lucas theorem”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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