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The section Definition and examples contains this sentence:
"Anellipse has exactly four vertices: two local maxima of curvature where it is crossed by the major axis of the ellipse, and two local minima of curvature where it is crossed by the minor axis."
But many people consider a circle to be a special case of an ellipse.
Even the linked Wikipedia article Ellipse states that an ellipse is a generalization of a circle.
I hope someone knowledgeable on this subject can fix this.
Given that the very next sentence is about circles, I think we can trust readers not to be deliberately obtuse and to understand that the part about ellipses really means non-circular ellipses. —David Eppstein (talk) 20:20, 6 June 2022 (UTC)[reply]