what a great "double" functional equation!

Power sums with Calculus.

what a nice functional equation!

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an absolutely surprising final solution to this functional equation.

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But what is the Fourier Transform? A visual introduction.

the geometry of the third derivative

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the most outlandish technique is used to solve this...

can you guess the tricks?

building the Fourier transform

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a notorious functional equation.

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The Discovery That Transformed Pi

The most useful polynomials you have never heard of.

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A nice functional equation from Romania