Small Groups and Their Conjugacy Classes

Oct 13, 2025 by wbrum.org 113 views

Introduction

Wikipedia has a vast and useful list of small groups, but often, we find ourselves in need of more detailed information. Specifically, a list of small groups along with their conjugacy classes would be incredibly valuable for researchers and students alike. In this article, we will provide a comprehensive resource for conjugacy classes of small groups, making it easier for you to find the information you need.

What are Conjugacy Classes?

Conjugacy classes are a fundamental concept in group theory, and they play a crucial role in understanding the structure of groups. In simple terms, a conjugacy class is a set of elements in a group that are conjugate to each other. Two elements a and b in a group G are conjugate if there exists an element g in G such that g-1ag = b. In other words, two elements are conjugate if they can be transformed into each other by an element of the group.

Why are Conjugacy Classes Important?

Conjugacy classes are important because they help us understand the structure of groups. By studying conjugacy classes, we can gain insights into the properties of groups, such as their order, simplicity, and solvability. Conjugacy classes also play a crucial role in the study of group representations, which is a fundamental area of mathematics.

Small Groups and Their Conjugacy Classes

Small groups are groups with a small number of elements, typically less than 100. These groups are often used as building blocks for larger groups, and they play a crucial role in understanding the structure of groups. In this article, we will provide a list of small groups along with their conjugacy classes.

List of Small Groups and Their Conjugacy Classes

Here is a list of small groups along with their conjugacy classes:

Cyclic Groups

Z2: {0, 1} - 1 conjugacy class
Z3: {0, 1, 2} - 1 conjugacy class
Z4: {0, 1, 2, 3} - 1 conjugacy class
Z5: {0, 1, 2, 3, 4} - 1 conjugacy class
Z6: {0, 1, 2, 3, 4, 5} - 1 conjugacy class
Z7: {0, 1, 2, 3, 4, 5, 6} - 1 conjugacy class
Z8: {0, 1, 2, 3, 4, 5, 6, 7} - 1 conjugacy class
Z9: {0, 1, 2, 3, 4, 5, 6, 7, 8} - 1 conjugacy class
Z10: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9} - 1 conjugacy class

Dihedral Groups

D2: {e, r, s, rs} - 2 conjugacy classes
D3: {e, r, r^2, s, rs, r^2s} - 3 conjugacy classes
D4: {e, r, r^2, r^3, s, rs, r^2s, r^3s} - 4 conjugacy classes
D5: {e, r, r^2, r^3, r^4, s, rs, r^2s, r^3s, r^4s} - 5 conjugacy classes
D6: {e, r, r^2, r^3, r^4, r^5, s, rs, r^2s, r^3s, r^4s, r^5s} - 6 conjugacy classes

Symmetric Groups

S3: {e, (12), (13), (23), (123), (132)} - 3 conjugacy classes
S4: {e, (12), (13), (14), (23), (24), (34), (123), (124), (134), (234), (1234), (1324), (1423), (1432)} - 5 conjugacy classes
S5: {e, (12), (13), (14), (15), (23), (24), (25), (34), (35), (45), (123), (124), (125), (134), (135), (145), (234), (235), (245), (345), (1234), (1235), (1245), (1345), (2345), (12345), (13245), (14235), (14325), (14523)} - 7 conjugacy classes

Other Small Groups

A4: {e, (12)(34), (13)(24), (14)(23), (123), (132), (142), (143), (234), (243), (253), (124), (134), (234), (1234), (1324), (1423), (1432)} - 4 conjugacy classes
A5: {e, (12)(34), (13)(24), (14)(23), (15)(23), (12)(35), (13)(25), (14)(25), (15)(24), (123), (124), (125), (132), (134), (135), (142), (143), (145), (152), (153), (162), (163), (172), (1234), (1235), (1245), (1345), (2345), (12345), (13245), (14235), (14325), (14523)} - 5 conjugacy classes

Conclusion

In this article, we have provided a comprehensive list of small groups along with their conjugacy classes. This resource will be incredibly valuable for researchers and students alike, making it easier to understand the structure of groups. We hope that this article has been helpful in providing a detailed and accurate list of conjugacy classes of small groups.

References

Wikipedia: Small groups
Wikipedia: Conjugacy class
Group Theory: A comprehensive resource for group theory
Small Groups: A list of small groups and their properties

Online Resources

Wikipedia: Group theory
Wikipedia: Small groups
Group Theory: A comprehensive resource for group theory
Small Groups: A list of small groups and their properties