The Origin of the First Phase Of The Fourier AnalysiS: The Origin Of It Is First And ForEmost about Fourier Himself. He was a logical starter who had a great influence on mathematics, science and our contemporary life, but he was not a professional mathematician or scientist, and his great contributions were made in his spare time. His main contribution was two: first, he was able to express in mathematical terms any periodic function represented as the sum of a set of sine and cosine functions, an infinite sum, now called a number.
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