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Math Help - Math Proof: 2=1

  1. #46
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by ThePerfectHacker View Post
    People must die for their false beliefs.
    my point is that no one believes the "proofs" here. they're like mathematical jokes... on another level
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  2. #47
    Senior Member JaneBennet's Avatar
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    Quote Originally Posted by janvdl View Post
    Isn't that a bit harsh?
    Probably. I tend to be a bit carried away when I post.

    Well, my point is that the way we represent certain mathematical concepts in symbols can be misleading. For example, representing the imaginary number i as \sqrt{-1} can mislead us into manipulating equations using rules for \sqrt{x} that only apply only when x\geq0.
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  3. #48
    Senior Member TriKri's Avatar
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    Quote Originally Posted by ThePerfectHacker View Post
    People must die for their false beliefs.
    Oh no! What have I done?
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  4. #49
    GAMMA Mathematics
    colby2152's Avatar
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    Quote Originally Posted by TriKri View Post
    Oh no! What have I done?
    Don't worry, be happy!
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  5. #50
    is up to his old tricks again! Jhevon's Avatar
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    Ok, group hug everyone!

    our group is Abelian, so it doesn't matter who hugs who in which order, just grab a partner
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  6. #51
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by Jhevon View Post
    Ok, group hug everyone!

    our group is Abelian, so it doesn't matter who hugs who in which order, just grab a partner
    I've got a fiancee already, but I can grab a pretty girl?

    -Dan
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  7. #52
    Super Member angel.white's Avatar
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    Quote Originally Posted by Jhevon View Post
    Ok, group hug everyone!

    our group is Abelian, so it doesn't matter who hugs who in which order, just grab a partner
    I hug Jhevon first!
    Quote Originally Posted by topsquark View Post
    I've got a fiancee already, but I can grab a pretty girl?

    -Dan
    If by "grab" you mean "acquire" for a platonic group hug, then yes. If by "grab" you mean "grope" / "pinch" / "fondle" / "caress" / "stroke" / "pet" or any other activity which could potentially "raise" your "morning sun" then...

    only if it's consentual.
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  8. #53
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by angel.white View Post
    If by "grab" you mean "acquire" for a platonic group hug, then yes. If by "grab" you mean "grope" / "pinch" / "fondle" / "caress" / "stroke" / "pet" or any other activity which could potentially "raise" your "morning sun" then...

    only if it's consentual.
    (sighs) Only that kind of detail can come from a Math forum!

    -Dan
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  9. #54
    Bar0n janvdl's Avatar
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    Quote Originally Posted by Jhevon View Post
    Ok, group hug everyone!

    our group is Abelian, so it doesn't matter who hugs who in which order, just grab a partner
    I'm with Topsquark(his idea not him )... But we only have 1 girl here...
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  10. #55
    GAMMA Mathematics
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    Quote Originally Posted by topsquark View Post
    I've got a fiancee already, but I can grab a pretty girl?

    -Dan
    Same here, when is your big date Dan?
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  11. #56
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    Quote Originally Posted by Quick View Post
    It hasn't been proven that \sqrt{-1\cdot-1}=\sqrt{-1}\cdot\sqrt{-1}
    given
    Sqrt-1*Sqrt-1

    Prove
    Sqrt-1*Sqrt-1

    Justifications
    Sqrt-1=i
    therefore: Sqrt-1*Sqrt-1= i^2
    Sqrt(-1*-1) = Sqrt-1*Sqrt-1 = i^2
    i^2=i^2

    if i am correct. i hope
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  12. #57
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by Alfarom View Post
    given
    Sqrt-1*Sqrt-1

    Prove
    Sqrt-1*Sqrt-1

    Justifications
    Sqrt-1=i
    therefore: Sqrt-1*Sqrt-1= i^2
    Sqrt(-1*-1) = Sqrt-1*Sqrt-1 = i^2
    i^2=i^2

    if i am correct. i hope
    The problem is that
    \sqrt{-1 \cdot -1} = \sqrt{1} = 1 \neq i^2

    You have assumed that \sqrt{-1 \cdot -1} = (\sqrt{-1})^2 in the third line of your justification. This is what you were trying to prove.

    -Dan
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