What does a ≡ b (mod n) mean? Basic Modular Arithmetic, Congruence | Summary and Q&A

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April 23, 2018
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blackpenredpen
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What does a ≡ b (mod n) mean? Basic Modular Arithmetic, Congruence

TL;DR

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

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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.

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