10. Linear Congruence Equations and Chinese Remainder Theorem
Linear congruences and their solutions can be effectively understood through two methods: the extended Euclidean algorithm and the Chinese Remainder Theorem (CRT). The chapter introduces linear congruences as an extension of linear equations into modular arithmetic, showcasing methods to find solutions under given conditions. Ultimately, it emphasizes the significance of finding unique solutions within a specified range, thus establishing a foundational understanding of linear congruences in discrete mathematics.
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Sections
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What we have learnt
- Linear congruences extend the concept of linear equations to modular arithmetic.
- The extended Euclidean algorithm can be used to solve linear congruences when the coefficients are coprime with the modulus.
- The Chinese Remainder Theorem provides a systematic way to solve multiple linear congruences when the moduli are pairwise coprime.
Key Concepts
- -- Linear Congruences
- Equations of the form ax ≡ b (mod N), where a, b, and N are integers and the goal is to find integer values of x.
- -- Extended Euclidean Algorithm
- An algorithm that computes the greatest common divisor of two integers and finds integers x and y such that ax + by = gcd(a, b).
- -- Chinese Remainder Theorem (CRT)
- A theorem stating that if you have n linear congruences with pairwise coprime moduli, there is a unique solution modulo the product of the moduli.
- -- Unique Solution
- A solution that exists in the range of 0 to M-1, where M is the product of the moduli in the CRT.
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