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    Prove:


    1 + 1 = 2
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    I don't feel like it
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    (Original post by integral_neo)
    Prove:


    1 + 1 = 2
    (Original post by integral_neo)


    1 + 1 = 2
    Proved.
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    (Original post by Pencil)
    Proved.
    Well done.
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    Doesnt it go back to euclidian rules of geometry, ie a thing of length one unit + a thing of length one unit = a thing of length 2 units, am i right???
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    (Original post by cobra01977)
    Doesnt it go back to euclidian rules of geometry, ie a thing of length one unit + a thing of length one unit = a thing of length 2 units, am i right???
    I thought you used Peano's axioms.
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    (Original post by Squishy)
    I thought you used Peano's axioms.
    Mine was a plain guess
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    My maths teacher had to do this at the beginning of her degree..
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    (Original post by imasillynarb)
    My maths teacher had to do this at the beginning of her degree..
    i know the proof is quite complex but I saw the newton proof for this but didnt understand it so i thought someone may know a method which i could understand
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    I did this in yr 10

    let a = b

    a² = ab Multiply both sides by a

    a² + a² - 2ab = ab + a² - 2ab Add (a² - 2ab) to both sides

    2(a² - ab) = a² - ab Factor the left, and collect like terms on the right

    2 = 1 Divide both sides by (a² - ab)
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    (Original post by integral_neo)
    i know the proof is quite complex but I saw the newton proof for this but didnt understand it so i thought someone may know a method which i could understand
    2 + 2 = 4 we know this to be true
    therefore, divide the whole lot by 2
    1 + 1 = 2


    Ruthie xx

    i think i deserve a prize!
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    (Original post by Widowmaker)
    I did this in yr 10

    let a = b

    a² = ab Multiply both sides by a

    a² + a² - 2ab = ab + a² - 2ab Add (a² - 2ab) to both sides

    2(a² - ab) = a² - ab Factor the left, and collect like terms on the right

    2 = 1 Divide both sides by (a² - ab)
    That wasn't the proof he wanted. He wanted 1 + 1 = 2, not 1 = 2.

    I don't think you need to prove it, it's just definition.
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    (Original post by Widowmaker)
    I did this in yr 10

    let a = b

    a² = ab Multiply both sides by a

    a² + a² - 2ab = ab + a² - 2ab Add (a² - 2ab) to both sides

    2(a² - ab) = a² - ab Factor the left, and collect like terms on the right

    2 = 1 Divide both sides by (a² - ab)

    2 = 1 :rolleyes:

    who asked u to prove 2 = 1? :eek:
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    (Original post by ruthiepoothie)
    2 + 2 = 4 we know this to be true
    therefore, divide the whole lot by 2
    1 + 1 = 2


    Ruthie xx

    i think i deserve a prize!

    not correct
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    (Original post by Nylex)
    That wasn't the proof he wanted. He wanted 1 + 1 = 2, not 1 = 2.

    I don't think you need to prove it, it's just definition.

    Proof does exist... and there are many versions of it
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    you cant prove an axiom!
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    (Original post by Willa)
    you cant prove an axiom!
    i have seen the proof for this in the principia by Newton, so yes u can and im sure an easier version of the proof exist
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    (Original post by JamesF)
    Click

    cheers
 
 
 
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