Upper half-plane

（重定向自Upper half plane）

In mathematics, the upper half-plane H is the set of complex numbers with positive imaginary part:

The term arises from a common visualization of the complex number x + iy as the point (x,y) in the plane endowed with Cartesian coordinates. When the Y-axis is oriented vertically, the "upper half-plane" corresponds to the region above the X-axis and thus complex numbers for which y > 0.

单词	Upper half plane
释义	Upper half plane 英语百科 Upper half-plane （重定向自Upper half plane） In mathematics, the upper half-plane H is the set of complex numbers with positive imaginary part: The term arises from a common visualization of the complex number x + iy as the point (x,y) in the plane endowed with Cartesian coordinates. When the Y-axis is oriented vertically, the "upper half-plane" corresponds to the region above the X-axis and thus complex numbers for which y > 0.
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