References

[1] Stuik, D. J. (1961) Classical Differential Geometry, Addison-Wesley

[2] Hass/Heil/Weir (2018) Thomas’ Calculus: Early Transcendentals, Pearson

[3] Four-Vertex Theorem Wikipedia

[4] Lipskie, L. (2022) A  Slightly Stronger Result for Monotone Functions, College of DuPage Pressbooks

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This work (An Ellipse Has Four Vertices by Larry Lipskie) is free of known copyright restrictions.

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