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June 3rd, 2012, 03:32 PM   #11
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Re: differential equation use substitution methode

Originally Posted by zell^
thx problems solved. now got an other one problem. how do i found out C is just C not lnC? how can i recognize it after intergration?

other one

It doesn't matter. For any (positive) C, ln(C) is just some real number. It doesn't matter whether you call the constant "ln(C)" or "C".
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June 3rd, 2012, 10:56 PM   #12
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Re: differential equation use substitution methode

We know C is arbitrary. And ln C is as arbitrary as C. So, without any loss of genarelity, we can say that C==ln C :)
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