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Math Help - ODE Proof

  1. #1
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    ODE Proof

    Hello,

    I need to prove something related to 1st order exact equations. Here's the question:
    Show that the diff. equation M+Ny'=0 has an integrating factor which is a function of z=x+y only if and only if

    (dM/dy - dN/dx)/(M-N)

    is a function of z only.

    I'd just like to get a tip on how to start the problem. Thank you!
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  2. #2
    Math Engineering Student
    Krizalid's Avatar
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    follow this:

    http://www.mathhelpforum.com/math-he...xy-158337.html

    it's the same procedure.
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  3. #3
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    Thank you very much!
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  4. #4
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    Aw, I'm sorry but I don't get it... I'm actually pretty bad at proofs. Honestly I have no idea what to do with the link you provided... Thanks.
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  5. #5
    Math Engineering Student
    Krizalid's Avatar
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    read it carefully, i can't help ya now because i'm going to bed.
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  6. #6
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    I did lol, but when I'm dealing with too many symbols and unknowns, I have a real hard time calculating something that makes sense. Sorry I'm that bad with proofs...
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