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Published byAmbrose Barton Modified over 8 years ago
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Then, Fourier Series: Suppose that f(x) can be expressed as the following series sum because Fourier Series cf. Orthogonal Functions Note: At this point, this is true for f(x) that is periodic with period L. However, it can be extended to non- periodic functions later. Kronecker delta
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Now, letThen
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Fourier Transform Then, Define Fourier Transform of f(x) as Since and integral is a “sum”, this means that function g(x) is expressible as a linear combination of cosines and sines, i.e., waves. (Inverse Fourier Transform)
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Dirac Delta ‘Function’ – Impulse Distribution A particular representation of Dirac Delta can be obtained via: Then, we write For any function g(x) that is continuous at x = 0, We call the limit a Dirac delta function if: oror...
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Exponential Representation of the Delta Function Can also take this as the limit: Also,
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