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I am in high school and currently preparing for math Olympiad. I want to study functional equations. I tried starting with B.J.Venkatachala's book but it seem way too advanced. What can I refer that starts from the basics and builds upto Olympiad level.

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The book by B.J Venkatchala is very nice to start off, anyways if you have little or no experience then Functional Equations and how to solve them is a way out. Cheers!

wrath
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