| 单词 | quadric inversion | 
| 释义 | > as lemmasquadric inversionEarly methods of inversion include  quadric inversion, in which a conic section is employed in the role more usually occupied by a circle, sphere, or hypersphere, and  tangential inversion, in which the form of the inversion is determined by the translation of the figure's tangents, rather than its points.extracted from inversionn. < as lemmas | 
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