Direct product of two semi-direct products

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SUMMARY

The discussion focuses on extending arguments related to the group structure defined by the semi-direct product of two groups, specifically $$G=(C_p:C_3)\times(C_q:C_3)$$ where $$p$$ and $$q$$ are primes congruent to 1 modulo 3. Participants clarify that $$C_p$$ represents a cyclic group of order $$p$$, and $$C_7:C_3$$ denotes a semi-direct product of cyclic groups of orders 7 and 3, respectively. The goal is to analyze the properties of this group structure and its implications in group theory.

PREREQUISITES
  • Understanding of group theory concepts, specifically semi-direct products.
  • Familiarity with cyclic groups and their properties.
  • Knowledge of modular arithmetic, particularly congruences.
  • Basic experience with mathematical notation and proofs in abstract algebra.
NEXT STEPS
  • Research the properties of semi-direct products in group theory.
  • Study the implications of primes congruent to 1 modulo 3 in group structures.
  • Explore the classification of cyclic groups and their applications.
  • Learn about the structure and characteristics of groups formed by direct products.
USEFUL FOR

Mathematicians, students of abstract algebra, and anyone interested in advanced group theory concepts and their applications in mathematical research.

Cairo
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Homework Statement
I need to find the number of elements and conjugacy classes for the direct product.
Relevant Equations
$$G=(C_7:C_3\ )\times(C_{13}:C_3\ )$$
After finding the number of elements for this group, how do I extend the argument to $$p,q\equiv1\left(mod\ 3\right)$$, where $$G=(C_p:C_3\ )\times(C_q:C_3\ )$$Any help appreciated.
 
Physics news on Phys.org
What is ##C_p## and what is ##C_7:C_3##?
 
$$C_7 : C_3$$ is a semi-direct product.

$$C_p$$ is as described. A prime, congruent to 1 mod 3.
 
Last edited:

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