Sylow's Theorem Proof for Group of Order 35^3 | Validity Check

In summary, to show that any group of order 35^3 has a normal subgroup of order 125, we can use Sylow's first theorem to find a Sylow p-subgroup of order 125, and then use Sylow's second and third theorems to show that this subgroup is normal in the group.
  • #1
Syrus
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Homework Statement



Show that any group of order 35^3 has a normal subgroup of order 125.


Homework Equations





The Attempt at a Solution



Is this a valid proof?


Let G be an arbitrary group of order 353. Note that 353 = 5373. Thus, by Sylow's first theorem, there is a sylow p-subgroup of order 125, which we refer to as H. But then, by Sylow's second theorem, it follows that H is conjugate to itself in G. Hence, H is normal in G.
 
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  • #2
I believe you are on the right track, however, I believe you have made an assumption. Sylow's second theorem says that all the Sylow 5-subgroups are conjugate to each other. This does imply normality of H iff H is the only Sylow 5-subgroup of G. I think you can use Sylow's third theorem to show that H is the only Sylow 5-subgroup.
 

1. What is Sylow's Theorem?

Sylow's Theorem is a fundamental result in group theory that provides a powerful tool for analyzing the structure of finite groups. It states that every finite group can be decomposed into smaller subgroups that have special properties.

2. What is the significance of Sylow's Theorem?

Sylow's Theorem is significant because it allows us to break down complex groups into simpler, more manageable subgroups. This makes it easier to study the structure and properties of finite groups, as well as to classify them.

3. What is the proof of Sylow's Theorem?

The proof of Sylow's Theorem involves constructing a set of subgroups, known as Sylow subgroups, that have specific orders and intersect in a certain way. By using group actions and counting arguments, it can be shown that these subgroups exist and are unique up to conjugacy.

4. What are the applications of Sylow's Theorem?

Sylow's Theorem has numerous applications in group theory and other areas of mathematics. It can be used to prove other important theorems, such as the Jordan-Holder Theorem and the Sylow Decomposition Theorem. It also has applications in number theory, algebraic geometry, and cryptography.

5. Are there any generalizations of Sylow's Theorem?

Yes, there are several generalizations of Sylow's Theorem, including the Transfer Theorem, Frattini's Argument, and the Wielandt-Nielsen Theorem. These results extend the ideas of Sylow's Theorem to more general settings, such as infinite groups and non-normal subgroups.

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