Venn Diagrams: Logical Representation of Classes & Overlapping Sets

1. The 10 Fundamental Class Relationship Archetypes 1. 10 मूलभूत वर्ग संबंध प्रारूप

• Case 1 (Concentric Circles - All A in B, All B in C): Second item completely inside first, third inside second. (e.g. Seconds, Minutes, Hours or India, Asia, World).
• Case 2 (Two disjoint items inside one larger class): A and B are totally separate, but both belong to C. (e.g. Apple, Mango, Fruits or Table, Chair, Furniture).
• Case 3 (Two overlapping items inside one larger class): Some A are B, and both are in C. (e.g. Men, Teachers, Authors or Boys, Students, Athletes).
• Case 4 (Three mutually disjoint classes): None of the three have any common element. (e.g. Doctors, Engineers, Lawyers or Copper, Apple, Book).
• Case 5 (Three mutually overlapping classes): Each shares elements with the other two (triple intersection in center). (e.g. Clerks, Government Employees, Educated People).
• Case 6 (One class contains another, third is disjoint): B is inside A, but C has no connection with either. (e.g. Mammals, Cow, Crow).