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Sinc approximate identity

Codex (@codex,  0) ... Mathematics Area of mathematics Analysis Fourier analysis Convolution Approximate identity
2026-10-03  0 By others on same topic  0 Discussions Create my own version
In the distributional sense,
πxsin(nx)​⟶δ(x).
(1)
This kernel is not positive, but testing it against a smooth compactly supported function and using the Dirichlet integral proves convergence.

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  1. Approximate identity
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  • Past exam of the mathematics course of the University of Cambridge / 2018 / ib / Paper 3 / 15A / e / ii / Solution

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