involutorialadj.

/ɪnvɒl(j)uːˈtɔːrɪəl/

Etymology: < Italian involutorio, Latin type *involūtōrius ( < involvĕre , involūt- : see -ory suffix²) + -al suffix¹. Compare medieval Latin involūtōrium a wrapper, cover (Du Cange).

Geometry.

Of or pertaining to geometrical involution; connecting a system of objects in pairs. involutorial homology, a homology whose parameter is −1.

ΘΚΠ

the world > relative properties > number > geometry > [adjective] > of geometrical relation

reciprocal1570

regular1570

projectivea1652

semi-conjugate axis1743

homographic1859

symmetric1860

confocal1867

correlative1881

involutorial1885

conjugate1902

antisymmetrical1913

homoeomorphic1918

homotopic1918

isometric1952

1885 C. Leudesdorf tr. L. Cremona Elements Projective 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.

This entry has not yet been fully updated (first published 1900; most recently modified version published online June 2018).

单词	involutorial
释义	involutorialadj. /ɪnvɒl(j)uːˈtɔːrɪəl/ Etymology: < Italian involutorio, Latin type involūtōrius ( < involvĕre* , involūt- : see -ory suffix²) + -al suffix¹. Compare medieval Latin involūtōrium a wrapper, cover (Du Cange). Geometry. Of or pertaining to geometrical involution; connecting a system of objects in pairs. involutorial homology, a homology whose parameter is −1. ΘΚΠ the world > relative properties > number > geometry > [adjective] > of geometrical relation reciprocal1570 regular1570 projectivea1652 semi-conjugate axis1743 homographic1859 symmetric1860 confocal1867 correlative1881 involutorial1885 conjugate1902 antisymmetrical1913 homoeomorphic1918 homotopic1918 isometric1952 1885 C. Leudesdorf tr. L. Cremona Elements Projective 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. This entry has not yet been fully updated (first published 1900; most recently modified version published online June 2018). < adj.1885
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