According to Wikipedia, Carl Friedrich Gauss invented it. Quote Wikipedia, "Modular arithmetic was introduced by Carl Friedrich Gauss in his book. Disquisitiones Arithmeticae
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All I found is Gauss discovered is a method for finding the sum of an arithmetic
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http://en.wikipedia.org/wiki/Arithmetic_….
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The link you have given actually does specify this quite well. To summarise: If both values are integers and one is unsigned, then the result will be an unsigned integer. If either
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