# Category:Class Theory

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This category contains results about Class Theory.

Definitions specific to this category can be found in Definitions/Class Theory.

**Class theory** is an extension of set theory which allows the creation of collections that are not sets by classes.

## Subcategories

This category has the following 23 subcategories, out of 23 total.

### A

### B

### C

### D

### E

### G

### N

### O

### R

### S

### T

### U

### V

### Z

## Pages in category "Class Theory"

The following 32 pages are in this category, out of 32 total.

### C

- Cardinal Class is Proper Class
- Cartesian Product with Proper Class is Proper Class
- Class Equal to All its Elements
- Class Equality is Reflexive
- Class Equality is Symmetric
- Class Equality is Transitive
- Class has Subclass which is not Element
- Class is Not Element of Itself
- Class is Transitive iff Union is Subset