31.Comparative Rate of Functions and Inde-pendent Variables 1
32.Derivatives 4
33.Newton’s Integrals and Riemann’s Integrals 7
34.Differential Equation 13
35.The Orthogonal Trajectories 17
36.Variations （Ⅰ） 22
37.Variations （Ⅱ） 27
38.Variations （Ⅲ） 31
39.The Distribution of Prime Numbers 36
40.Comments on the Zeta Function 43
41.Fermat’s Equation 47
42.Constructions by Ruler and Compass 52
43.Number （Ⅰ） 57
44.Number （Ⅱ） 61
45.Sets， Systems， and Groups 63
46.Concepts of Sets （Ⅰ） 67
47.Concepts of Sets （Ⅱ） 72
48.On Cantor’s Definition of Set 76
49.The Upper and Lower Boundaries of a Linear Set of Points 81
50.Bounded Set and Unbounded Set 84
51.Denumerable Sets （Ⅰ） 87
52.Denumerable Sets（Ⅱ） 91
53.The Continuum of Real Numbers （Ⅰ） 95
54.The Continuum of Real Numbers （Ⅱ） 98
55.The Concept of Cardinal Number （Ⅰ） 101
56.The Concept of Cardinal Number （Ⅱ） 105
57.Definition of Order 110
58.Property of Order-Relation 113
59.Ordered Sets （Ⅰ） 117
60.Ordered Sets （Ⅱ） 120