单词 | involutorial |
释义 | involutorial, a. Geom.|ɪnvɒl(j)uːˈtɔərɪəl| [f. It. involutorio, L. type *involūtōri-us (f. involvĕre, involūt-: see -ory) + -al1. Cf. med.L. involūtōrium a wrapper, cover (Du Cange).] Of or pertaining to geometrical involution; connecting a system of objects in pairs. involutorial homology, a homology whose parameter is -1.
1885C. Leudesdorf Cremona's Proj. Geom. 64 In this case the homology is called harmonic or involutorial, and two corresponding points (or lines) correspond to one another doubly; that is to say, every point (or line) has the same correspondent whether it be regarded as belonging to the first or the second figure. |

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