![discrete mathematics - Why doesn't the author subtract everything by two first before applying modulus? - Mathematics Stack Exchange discrete mathematics - Why doesn't the author subtract everything by two first before applying modulus? - Mathematics Stack Exchange](https://i.stack.imgur.com/NpjFa.png)
discrete mathematics - Why doesn't the author subtract everything by two first before applying modulus? - Mathematics Stack Exchange
![modular arithmetic - What does $p≡3\mod4$ mean, and how do you find a prime matching this pattern? - Mathematics Stack Exchange modular arithmetic - What does $p≡3\mod4$ mean, and how do you find a prime matching this pattern? - Mathematics Stack Exchange](https://i.stack.imgur.com/wZE5S.png)
modular arithmetic - What does $p≡3\mod4$ mean, and how do you find a prime matching this pattern? - Mathematics Stack Exchange
![Modular (Remainder) Arithmetic n = qk + r (for some k; r < k) eg 37 = (2)(17) + 3 Divisibility notation: 17 | n mod k = r 37 mod 17 = ppt download Modular (Remainder) Arithmetic n = qk + r (for some k; r < k) eg 37 = (2)(17) + 3 Divisibility notation: 17 | n mod k = r 37 mod 17 = ppt download](https://images.slideplayer.com/26/8780672/slides/slide_11.jpg)