Cubic function (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Cubic function" in English language version.

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Bostock, Linda; Chandler, Suzanne; Chandler, F. S. (1979). Pure Mathematics 2. Nelson Thornes. p. 462. ISBN 978-0-85950-097-5. Thus a cubic equation has either three real roots... or one real root...
Hughes-Hallett, Deborah; Lock, Patti Frazer; Gleason, Andrew M.; Flath, Daniel E.; Gordon, Sheldon P.; Lomen, David O.; Lovelock, David; McCallum, William G.; Osgood, Brad G. (2017-12-11). Applied Calculus. John Wiley & Sons. p. 181. ISBN 978-1-119-27556-5. A point at which the graph of the function f changes concavity is called an inflection point of f

Weisstein, Eric W. "Stationary Point". mathworld.wolfram.com. Retrieved 2020-07-27.