The mathematical formulation of the quantum theory has required the use of imaginary numbers.

量子理论的数学公式需要运用虚数。

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For example, this method could easily support imaginary Numbers.

例如，此方法可以轻易地支持虚数。

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This is the space on which all numbers, real, imaginary and combinations of the two, can be plotted.

ECONOMIST: Beno?t Mandelbrot

And, as Euler's successor, Carl Friedrich Gauss, was to discover, if you plot real numbers on one axis of a graph and imaginary ones on the other, you create a plane that represents both sorts of numbers.

ECONOMIST: Beno?t Mandelbrot

Complex numbers, which have a real and an imaginary part added together, are the points on this plane that do not lie on either axis.

ECONOMIST: Beno?t Mandelbrot