Odd Primes Congruent to 1 or 3 mod 4: Proof

  • Context: Undergrad 
  • Thread starter Thread starter Lenardo
  • Start date Start date
  • Tags Tags
    Prime
Click For Summary

Discussion Overview

The discussion revolves around the statement that any odd prime number is congruent to either 1 or 3 modulo 4. Participants explore the validity of this claim and seek ways to prove it, while also considering related properties of odd integers.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions the truth of the statement regarding odd primes and their congruence to 1 or 3 mod 4.
  • Another participant suggests that the proof may not be difficult and prompts consideration of numbers that are congruent to 2 or 0 modulo 4.
  • A participant references the "Division Algorithm" as a potential tool for understanding the congruence.
  • There is a suggestion that the statement could be simplified to say that all odd numbers are congruent to 1 mod 2, implying that odd primes follow this rule.
  • One participant asserts that the statement can be generalized to all odd integers, not just primes, indicating that any odd integer is either 1 or 3 mod 4.

Areas of Agreement / Disagreement

Participants express differing views on the original statement, with some supporting it specifically for odd primes and others extending the discussion to all odd integers. The discussion remains unresolved regarding the proof and the specific focus on primes versus odd integers.

Contextual Notes

Some participants reference properties of numbers modulo 4 without fully resolving the implications for odd primes specifically. There is a lack of consensus on the proof methodology and the generalization of the statement.

Lenardo
Messages
3
Reaction score
0
Is the following statement true ?

Any odd prime number is congruent to either 1 or 3 mod 4.

If yes , then how we could prove it ?
 
Physics news on Phys.org
It's not as hard as it looks. Think of some actual numbers that are congruent to 2 or 0 modulo 4.
 
Aha.. I read before couple of minutes something called "Division Algorithm" ..and I can see why ? thank you
 
Are you still trying to prove that odd primes = 1 or 3 mod 4? I'm glad if you solved that now.
 
You can simplify it to "all odd numbers are congruent to 1 mod 2." To answer your question: yes, all odd primes adhere to the rules for all odd numbers.
 
I understood ..Thank you all
 
You can totally remove "prime" from that statement. Any odd INTEGER is 1 or 3 mod 4! If it's 0 or 2 mod 4 then it's even. I feel like bouncing my lips with my index finger in a rude gesture now.
 

Similar threads

  • · Replies 17 ·
Replies
17
Views
2K
  • · Replies 21 ·
Replies
21
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
Replies
16
Views
3K
  • · Replies 17 ·
Replies
17
Views
3K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 11 ·
Replies
11
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 31 ·
2
Replies
31
Views
3K
Replies
27
Views
4K