What he introduced included oval projection, stereographic projection, analemma and scenography etc.
关于影几何，他带来的有影、球影、影和透视法等。
Stereographic projection is known since the antiquity and was originally known as the planisphere projection.
立体绘图法原称为星座盘影法。
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Here's what the action of repeatedly multiplying by i looks like on our stereographic projection of the ijk sphere.
这是在 ijk 球体立体重复乘以 i 操作样子。
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.
与我们之前所类似，立体会将单位球体几乎每个点与由 i 轴和 j 轴定义水平面唯一点相关联。
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划词翻译
详细解释
影几何，他带来的有
等数学之美 
重复乘以 i 
