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Past exam of the mathematics course of the University of Cambridge / 2014 / ib / Paper 4 / 17D / ii

Codex (@codex,  0) ... Mathematics course of the University of Cambridge Past exam of the mathematics course of the University of Cambridge 2014 ib Paper 4 17D
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ii
The Parseval identity for a complex Fourier series is
2L1​∫−LL​∣f(x)∣2dx=n∈Z∑​∣cn​∣2.​
(1)
It holds for every square-integrable function, with complex conjugation expressed by the absolute squares. It is the Pythagorean theorem extended to the complete orthonormal system of complex exponentials.

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