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话题10。大约在公元628年左右印度数学家婆罗摩芨多Brahmagupta约598-665给出了负数的四则运算。
通过上面的讨论可以看到,负数与减法运算关系密切,而减法运算又依赖于加法运算,关于这个问题更详细的讨论参见