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本帖最后由 dodonaomikiki 于 2018-12-18 15:59 编辑
图片【见图】注释
Domain coloring of the complex function.
Phase is coded by the hue and module by the value
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以下是关于文字旁注,关于【复数の可视化】
When visualizing complex functions, a complex input and output are both needed. Because each complex number is represented in two dimensions, visually graphing a complex function with both the input and output would require perception of four dimensional space, which is impossible. Because of this, other ways of visualizing complex functions have been designed.
In Domain coloring, the third and fourth dimensions can instead be represented by color and brightness, typically with color representing the angle of the complex number in polar form and brightness representing the magnitude. These plots are called color wheel graphs. This provides a simple way to visualize the functions without losing information.
Riemann surfaces are another way to visualize complex functions. Riemann surfaces can be thought of as deformations of the complex plane; while the horizontal axes represent the real and imaginary inputs, the single vertical axis only represents either the real or imaginary output. However, Riemann surfaces are built in such a way that rotating them 180 degrees shows the imaginary output, and vice versa. Unlike domain coloring, Riemann surfaces can represent multivalued functions like √z
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以下是:过往历史の简短回顾
The solution in radicals (without trigonometric functions) of a general cubic equation contains the square roots of negative numbers when all three roots are real numbers, a situation that cannot be rectified by factoring aided by the rational root test if the cubic is irreducible (the so-called casus irreducibilis). This conundrum led Italian mathematician Gerolamo Cardano to conceive of complex numbers in around 1545,[16] though his understanding was rudimentary.
Work on the problem of general polynomials ultimately led to the fundamental theorem of algebra, which shows that with complex numbers, a solution exists to every polynomial equation of degree one or higher. Complex numbers thus form an algebraically closed field, where any polynomial equation has a root.
Many mathematicians contributed to the full development of complex numbers. The rules for addition, subtraction, multiplication, and division of complex numbers were developed by the Italian mathematician Rafael Bombelli.[17] A more abstract formalism for the complex numbers was further developed by the Irish mathematician William Rowan Hamilton, who extended this abstraction to the theory of quaternions.
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