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Math Help - Natural log notation

  1. #1
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    Natural log notation

    I'm a bit confused, if
     y= e^x
    then x = log_{e}y
    log_{e} = ln
    x = log_{e}y = lny
    So why is the natural log always shown as lnx and not lny ?
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  2. #2
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    Quote Originally Posted by hciR View Post
    I'm a bit confused, if
     y= e^x
    then x = log_{e}y
    log_{e} = ln
    x = log_{e}y = lny
    So why is the natural log always shown as lnx and not lny ?
    You can take the natural log of x, y or any other pronumeral you want. It is not restricted only to x. So I don't see what your problem is.
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  3. #3
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    I think it's just the way my book explains it is confusing me, do you know a free graphing software that can plot exponentials? I have one called mathGV but it can't do them.
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  4. #4
    Super Member craig's Avatar
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    As MF said you can take the natural log of any pronumeral you wish.

    In most textbooks I have seen, a lot of the questions are in the form y = f(x), this means y is equal to a function of x. A lot of natural log questions therefore are along the lines of y = \ln{x} + somethingelse.

    This will be the reason that the majority of questions you have seen are \ln{x}, not \ln{y}.
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