本文给出了三维射影空间上对合透视的代数表达式。
In this paper we discuss the algebraic expression of involutory perspective in three-dimensional projective space.
为求这一角度，首先我们求出射程的一般代数表达式。
To find this Angle, we first work out general algebraic expression for the range.
数学语言，代数语言：一种计算机语言，其陈述方式设计得与代数表达式相似。
Computer Science a computer language whose statements are designed to resemble algebraic expressions.
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