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Differential equations in itself is a very complex topic. I read this article on a website that we can apply differential equations to optics and something like brachistochrone problem. What is this brachistochrone problem?

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    [Google](http://tinyurl.com/beaqv2f) is your friend. Also, you should read about the [Eikonal Equation](http://tinyurl.com/a4j35gk)2012-11-08
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    You are aware of Maxwell's equations, by any chance?2012-11-08

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