Why certain topics in elementary number theory?

In summary, elementary number theory courses cover topics such as gcd, linear Diophantine equations, Fundamental Theorem of Arithmetic, factorization, modular arithmetic, Fermat's Little Theorem, Euler's Theorem, primitive roots, quadratic residues, and nonlinear Diophantine equations because they are necessary tools for understanding and working with number theory. Without these foundations, it would be difficult to delve into more complex concepts such as the Riemann Hypothesis or the prime number theorem. Additionally, many conjectures in number theory appear simple on the surface but are actually incredibly difficult to prove analytically, making the subject an "analytical nightmare."
  • #1
matqkks
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Why do all elementary number theory courses have the following topics - gcd, linear Diophantine equations, Fundamental Theorem of Arithmetic, factorization, modular arithmetic, Fermat's Little Theorem, Euler's Theorem, primitive roots, quadratic residues and nonlinear Diophantine equations?
 
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Those are all tools which are necessary to do the real work. As long as they won't be taught at school, such courses will have to start with them. What is the alternative? Riemann and Chebyshev right from the start? One can approach the subject purely analytically, but this narrows the subject. With the theorems listed above, one can continue with Computer Science or the prime number theorem and other analytical results.
 
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  • #3
Or perhaps prove or disprove the Riemann Hypothesis. One can always dream.

Diophantine equations can be devilishly hard to solve analytically.
 
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  • #4
When I think of all these conjectures, which are more or less easily stated, and yet, are devilishly hard, then the entire field is an analytical nightmare. Just read today about the Legendre conjecture (unproven):
$$\text{ There is always a prime between }n^2 \text{ and }(n+1)^2$$
I mean, could it look more innocent?
 
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  • #5
That’s a nice conjecture that I’ve not heard of before either.
 
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1. Why is elementary number theory important?

Elementary number theory is important because it provides the foundation for more advanced branches of mathematics such as algebra, geometry, and calculus. It also has many practical applications in fields such as cryptography, computer science, and physics.

2. What are some common topics in elementary number theory?

Some common topics in elementary number theory include prime numbers, divisibility, modular arithmetic, and the fundamental theorem of arithmetic. Other topics may include factors, multiples, and prime factorization.

3. How does elementary number theory relate to real-world problems?

Elementary number theory can be used to solve real-world problems such as finding the most efficient way to distribute goods among a group of people, determining the probability of certain events occurring, and creating secure encryption methods for data protection.

4. What are some strategies for solving problems in elementary number theory?

Some strategies for solving problems in elementary number theory include using divisibility rules, prime factorization, and modular arithmetic. It is also helpful to break down larger problems into smaller, more manageable parts and to use logical reasoning to eliminate incorrect solutions.

5. How can I improve my understanding of elementary number theory?

To improve your understanding of elementary number theory, it is important to practice solving problems and to seek out additional resources such as textbooks, online tutorials, and practice exercises. Collaborating with others and discussing different approaches to solving problems can also help improve your understanding.

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