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Fermat's principle
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== In popular culture == The short story ''[[Story of Your Life]]'' by the speculative fiction writer [[Ted Chiang]] contains visual depictions of Fermat's Principle along with a discussion of its teleological dimension. [[Keith Devlin]]'s ''The Math Instinct'' contains a chapter, "Elvis the Welsh Corgi Who Can Do Calculus" that discusses the calculus "embedded" in some animals as they solve the "least time" problem in actual situations.
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