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    #1

    What is this method named?

    Let say I have to prove A = B. I assume that A is not equal to B and I derive that this assumption violates a well-known statement, meaning that this assumption is not true. Therefore A must equal B ( It is proven).

    My question: What is this method named?

    Thanks in advance.

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    #2

    Re: What is this method named?

    Algebara or geometry depending on the problem?????

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    #3

    Re: What is this method named?

    Quote Originally Posted by Searching for language View Post
    Algebara or geometry depending on the problem?????
    The name of this method does not depend on a specific problem.
    Let's say you have to prove that something is true, you assume that it is not true, you do things, and you end up with a conclusion that this assumption is wrong, then you get the proof.

  1. Barb_D's Avatar
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    #4

    Re: What is this method named?

    My 10th grade math teacher would know this. I remember using this method to prove that the square root of 2 is irrational, by starting by assuming it was rational.

    We need a math teacher to stop by.

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    #5

    Re: What is this method named?

    Quote Originally Posted by Barb_D View Post
    My 10th grade math teacher would know this. I remember using this method to prove that the square root of 2 is irrational, by starting by assuming it was rational.

    We need a math teacher to stop by.
    Yes, I still remember this problem that you mentioned. But I could not recall the name of this method

    Does anyone else have the answer?

  2. Offroad's Avatar
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    #6

    Smile Re: What is this method named?

    I'd call it Logic or Logicism.

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    #7

    Re: What is this method named?

    Quote Originally Posted by marciobarbalho View Post
    I'd call it Logic or Logicism.
    Thanks, but this method is less general than what you suggested.

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    #8

    Re: What is this method named?

    More suggestion please? Thanks.

  3. Barb_D's Avatar
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    #9

    Re: What is this method named?

    Proof by contradiction!

    Proofs by Contradiction

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