What he introduced included oval projection, stereographic projection, analemma and scenography etc.
关几何，他带来的有椭圆、球、平行正和透视法等。
Stereographic projection is known since the antiquity and was originally known as the planisphere projection.
图法原称为星座盘法。
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Here's what the action of repeatedly multiplying by i looks like on our stereographic projection of the ijk sphere.
这是我们对ijk球进行球极投，复乘以i操作效果。
Analogous to what we did before, stereographic projection will associate almost every point on the unit sphere with a unique point on the horizontal plane defined by the i and the j axes.
类似于我们做法，球极投会将单位球面上几乎每一个点与由i轴和j轴定义水平平面上一个唯一点关联起来。
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划词翻译
详细解释
几何，他带来的有椭圆
数学
美 
图法原称为星座盘
，
复乘以i
操作效果。
