Proving k divides Euler's totient function using group theory

In summary, Number theory is a branch of mathematics that focuses on the properties and relationships of integers. Common problems in this field include prime numbers, divisibility, and modular arithmetic. Its applications can be seen in cryptography, coding theory, and various scientific fields. To solve problems in number theory, strong algebraic skills, a solid understanding of number properties, and abstract thinking are necessary. Famous unsolved problems in number theory include the twin prime conjecture, Goldbach's conjecture, and the Riemann hypothesis.
  • #1
kohb
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Homework Statement


a > 1, k > 0. Show that k divides \phi(a^k - 1), where \phi is Euler's totient function (Hint: use some group theory).


Homework Equations


If n = p_1^{a_1}p_2^{a_2}...p_m^{a_m}, then \phi(n) = n(1 - 1/p_1)(1 - 1/p_2)...(1 - 1/p_m)


The Attempt at a Solution


I guess that I need somehow use the fact that \phi(n) is an order of multiplicative group U(Z/nZ), but I don't see how.

Any suggestions are appreciated!
Thanks!
 
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  • #2
Guys, does anyone have any ideas how to do it?
 

1. What is number theory?

Number theory is a branch of mathematics that deals with the properties and relationships of numbers. It focuses on studying the patterns and structures that exist within the set of all integers.

2. What are some common types of number theory problems?

Some common types of number theory problems include prime number problems, divisibility problems, and problems related to modular arithmetic. Other topics within number theory include Diophantine equations, quadratic residues, and the distribution of prime numbers.

3. How is number theory used in real-world applications?

Number theory has many practical applications, including cryptography, coding theory, and computer science. It is also used in various fields of science, such as physics and chemistry, to model and understand natural phenomena.

4. What skills are useful for solving number theory problems?

Strong algebraic skills, a solid understanding of number properties, and the ability to think abstractly are all important for solving number theory problems. Familiarity with mathematical notation and proof techniques is also helpful.

5. Are there any famous unsolved problems in number theory?

Yes, there are several famous unsolved problems in number theory, such as the twin prime conjecture, Goldbach's conjecture, and the Riemann hypothesis. These problems have intrigued mathematicians for centuries and continue to be actively researched today.

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