What does a ≡ b (mod n) mean? Basic Modular Arithmetic, Congruence  Summary and Q&A
TL;DR
Congruence modulo N means that two numbers have the same remainder when divided by N.
Key Insights
 🙅 Congruence modulo N implies that two numbers have the same remainder when divided by N.
 🎛️ The equation form a = kn + b is a useful alternative interpretation of congruence modulo N.
 #️⃣ Subtracting the two numbers in a congruence equation gives a multiple of N.
 🎛️ The equation form a  b = kn indicates that N divides into the difference between the two numbers.
 🪜 Negative remainders can be resolved by adding the modulus to obtain a positive remainder.
 🙅 Congruence modulo N is a fundamental concept in number theory and modular arithmetic.
 ❓ Congruence can be used to solve equations and proofs in mathematics.
Transcript
like what does this mean when we have a is congruent to b mod n and all the following are pretty much equivalent and depending on the situations you can interpret them differently okay so perhaps the first thing i want to tell you guys that when we have a is congruent to b mod n this means that a and b have the same remainder and i will put on quot... Read More
Questions & Answers
Q: What does "a is congruent to b mod n" mean?
"a is congruent to b mod n" means that a and b have the same remainder when divided by n.
Q: Can congruence with negative numbers be interpreted differently?
Yes, congruence with negative numbers can be handled by adding the modulus to obtain a positive remainder.
Q: How can congruence be written in equation form?
Congruence can be written as a = kn + b, where k is a constant and b represents the remainder.
Q: How can congruence be used to solve equations?
By converting congruence into an equation, it becomes easier to solve for unknown variables in the equation.
Summary & Key Takeaways

Congruence modulo N means that two numbers have the same remainder when divided by N.

An equation form, a = kn + b, can also be used to interpret congruence modulo N.

Congruence can be used to solve equations and proofs in mathematics.