2 - 3.2.1 Parseval's Theorem

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A short derivation of the Parseval's Theorem relating energy between the time and frequency domains.

The information in this video will help you understand concepts found in "Modern Digital and Analog Communication" by B.P. Lathi and Zhi Ding.

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finally someone that actually mentions the frequency vs time domain

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This proof is not right. You do not use the same exponential function for both the direct and inverse Fourier transform. One must have a positive exponent and the other a negative exponent. The proof is based on complex analysis and the notion of conjugate.

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