Bazsites.com Transform Calculus

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Introduction To Fourier Transform - A description of the principle of fourier transform and subsequent derivation of formulae. Page includes graphs.
Fast Fourier Transforms - Survey and history of FFT algorithms from Wikipedia.
An Introduction to Fourier Theory - A mathematically inclined introduction with illustrations and explanations of related theorems, its properties and numerical methods for calculating transforms.
Introduction to the Fourier Transform - Notes on applications to Image Processing.
Mathematics of the Discrete Fourier Transform (DFT) - Notes by Julius O. Smith III, Stanford.
Fast Fourier Transform - Article in MathWorld.

Fundamental lemma of calculus of variations - In mathematics, specifically in the calculus of variations, the fundamental lemma in the calculus of variations is a lemma that is typically used to transform a problem from its weak formulation (variational form) into its strong formulation (differential equation).