6. Infinitely distant point
7. Axial pencil; fundamental forms
8. Perspective position
9. Projective relation
10. Infinity-to-one correspondence
11. Infinitudes of different orders
12. Points in a plane
13. Lines through a point
14. Planes through a point
15. Lines in a plane
16. Plane system and point system
17. Planes in space
18. Points of space
19. Space system
20. Lines in space
21. Correspondence between points and numbers
22. Elements at infinity
PROBLEMS
CHAPTER II - RELATIONS BETWEEN FUNDAMENTAL FORMS IN ONE-TO-ONE
CORRESPONDENCE WITH EACH OTHER
23. Seven fundamental forms
24. Projective properties
25. Desargues’s theorem
26. Fundamental theorem concerning two complete quadrangles
27. Importance of the theorem
28. Restatement of the theorem
29. Four harmonic points
30. Harmonic conjugates
31. Importance of the notion of four harmonic points
32. Projective invariance of four harmonic points