摘 要: | Mathematicians knew that the multiplication of two negative numbers yields a positive product Thus, not only does+1×+1=+1,but-1×-1=+1. What number,then,multiplied by itself yields -1? To put it another way,what is the square root of -1? Mathematicians can invent the necessary number, call it an imaginary number,and symbolize it as i for
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