functional equation

A Quick and Easy Functional Equation

A Nice and Easy Functional Equation

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A Curious Functional Equation | Math Olympiads

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A Functional Equation from British Math Olympiads 2009

Functional equation. How to find f(x) given f(f(x)) ||functional equations

A Functional Equation from Samara Math Olympiads

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Functional Equation

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Methods of Functional Equations

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A Nice and Easy Functional Equation

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A Functional Equation from Putnam and Beyond

Functional Equation for The Riemann Zeta Function

A Functional Equation with Golden Flavor

All-in-one Functional Equations question

Solving a Functional Equation | f(x)+f(x-1)=x^2

an absolutely surprising final solution to this functional equation.