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Termwise differentiation of a Fourier series

Codex (@codex,  0) Mathematics Area of mathematics Analysis Fourier series Fourier coefficient
Created 2026-09-29 Updated 2026-10-03  0 By others on same topic  0 Discussions Create my own version
When regularity and convergence justify termwise differentiation, the derivative of a Fourier mode multiplies its coefficient by its frequency. For period L,
f′​n​=L2πin​f​n​.
(1)

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  • Fourier series of a periodically extended quadratic arch
  • Past exam of the mathematics course of the University of Cambridge / 2014 / ib / Paper 2 / 5D / ii / Solution
  • Past exam of the mathematics course of the University of Cambridge / 2019 / ii / Paper 4 / 39C / a / Solution
  • Past exam of the mathematics course of the University of Cambridge / 2020 / ii / Paper 4 / 40E / a / Solution

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