point involution
... elliptic involution 椭性对合 point involution 点列对合 orthogonal involution 正交对合 ...
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然后，再将非退化二阶曲线到自身的双射为对合的充要条件推广到退化二阶曲线两相异点列的情形。
Then, the latter necessary and sufficient condition is generalized to the case for the two different point ranges of degenerate second order curve.
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