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Unformatted text preview: ater book, the Liber Quadratorum (Book of Squares), written around 1225, which contains entirely original work devoted to second degree Diophantine equations, and was written at a level that most scholars of that time could not comprehend. Fibonacci’s talent was eventually recognized by those in authority, and he became a regular guest of Emperor Frederick II after successfully answering some difficult challenge problems set by one of his courtiers (including solving a cubic equation correct to ten decimal places). This led to a decree made by the Republic of Pisa in 1240 in which a salary was awarded to “... the serious and learned Master Leonardo (Fibonacci) ... “ for his services to the city. An example of his ability is shown in the clever proof below of a...
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