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Elementary Number Theory Problems 4.2 Solution (David M. Burton's 7th Edition) - Q18
My Solution for "If $a \equiv b \pmod {n_{1}}$ and $a \equiv c \pmod {n2}$, prove that $b \equiv c \pmod {n}$, where the integer $n = gcd(n_{1}, n_{2})$."
Background
All theorems, corollaries, and definitions listed in the book's order:
![](https://www.ranblog.com/content/images/2022/11/burtonNumTheory-1.jpeg)
I will only use theorems or facts that are proved before this question. So, you will not see that I quote theorems or facts from the later chapters.
Question
If $a \equiv b \pmod {n_{1}}$ and $a \equiv c \pmod {n_{2}}$, prove that $b \equiv c \pmod {n}$, where the integer $n = gcd(n_{1}, n_{2})$.
Solution
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