100
Anharmonic ratio, 46, 161, 184, 185
Apollonius (second half of third century B.C.), 70
Archimedes (287-212 B.C.), 176
Aristotle (384-322 B.C.), 169
Asymptotes, 111, 113, 114, 115, 116, 117, 118, 148
Axes of a conic, 148
Axial pencil, 7, 8, 23, 50, 54
Axis of perspectivity, 8, 47
Bacon (1561-1626), 162
Bisection, 41, 109
Brianchon (1785-1864), 84, 85, 86, 88, 89, 90, 95, 105, 113, 174, 184
Calculus, 176
Carnot (1796-1832), 179
Cauchy (1789-1857), 179, 181
Cavalieri (1598-1647), 162
Center of a conic, 107, 112, 148
Center of involution, 141, 142
Center of perspectivity, 8
Central conic, 120
Chasles (1793-1880), 168, 179, 180, 184
Circle, 21, 73, 80, 145, 146, 147
Circular involution, 147, 149, 150, 151
Circular points, 146
Class of a curve, 183
Classification of conics, 110
Collineation, 175
Concentric pencils, 50
Cone of the second order, 59
Conic, 73, 81
Conjugate diameters, 114, 148
Conjugate normal, 151
Conjugate points and lines, 100, 109, 138, 139, 140
Constants in an equation, 21
Contingent relations, 180, 181
Continuity, 180, 181
Continuous correspondence, 9, 10, 21, 49
Corresponding elements, 64
Counting, 1, 4
Cross ratio, 46
Darboux, 176, 186
De Beaugrand, 170
Degenerate pencil of rays of the second order, 58, 93
Degenerate point-row of the second order, 56, 78
De la Hire (1640-1718), 168, 171, 175
Desargues (1593-1662), 25, 26, 40, 121, 125, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 174, 175
Descartes (1596-1650), 162, 170, 171, 174, 176
Descriptive geometry, 179
Diameter, 107
Directrix, 157, 158, 159, 160
Double correspondence, 128, 130
Double points of an involution, 124
Double rays of an involution, 133, 134
Duality, 94, 104, 161, 18