Results 1 to 6 of 6

Math Help - The Symbol In

  1. #1
    MHF Contributor
    Joined
    Jul 2008
    From
    NYC
    Posts
    1,489

    The Symbol In

    I am having trouble distinguishing between the symbol In and the word log.

    (1) What's the difference between the two?

    (2) What exactly does the symbol In mean?

    Follow Math Help Forum on Facebook and Google+

  2. #2
    Math Engineering Student
    Krizalid's Avatar
    Joined
    Mar 2007
    From
    Santiago, Chile
    Posts
    3,654
    Thanks
    13
    It's actually \ln, which means "natural logarithm."

    The natural logarithm can be rewritten as \log_e, where e is a constant. In particular, most calculus books treat \log equivalently as \ln.

    ( \log has the base 10, but there's no need to write it.)
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Super Member
    Joined
    Jun 2008
    Posts
    792
    Log, unless otherwise specified, is usually considered to be base 10. Ln is simply a notation. Ln is actually log base e.

    \log{10} = \log_{10}{10} = 1

    \log_e{e} = \ln{e} = 1


    Ln is an abbreviation for logarithmus naturalis. Read more here if you're interested:
    Natural logarithm - Wikipedia, the free encyclopedia
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Super Member wingless's Avatar
    Joined
    Dec 2007
    From
    Istanbul
    Posts
    585
    Firstly, if you're talking about the logarithm, its ln (L and N) instead of In

    1. ln is always the natural logarithm, (logarithm to the base e). But log can mean either the natural logarithm or logarithm to the 10.

    2. ln means either logarithmus naturalis or logarithm napieren, I'm not sure about this.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by Chop Suey View Post
    Log, unless otherwise specified, is usually considered to be base 10.
    Only by secondary/high school teachers. To the rest of the world it is a logarithm to an unspecified base. (In computer programming languages it usualy denotes the natural logarithm)

    If the base is important it should always be specified, or obvious from context.

    RonL
    Follow Math Help Forum on Facebook and Google+

  6. #6
    MHF Contributor
    Joined
    Jul 2008
    From
    NYC
    Posts
    1,489

    I learned A Lot Here

    The replies here helped a lot. I finally got the notes that I missed in class.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. The [tex]\in[/tex] symbol
    Posted in the Algebra Forum
    Replies: 2
    Last Post: September 3rd 2010, 09:39 PM
  2. Set symbol
    Posted in the LaTeX Help Forum
    Replies: 1
    Last Post: July 6th 2010, 05:56 PM
  3. what does this symbol mean
    Posted in the Math Topics Forum
    Replies: 4
    Last Post: February 22nd 2010, 09:50 PM
  4. What does this symbol mean?
    Posted in the Calculus Forum
    Replies: 10
    Last Post: February 10th 2009, 07:01 AM
  5. What does this symbol mean?
    Posted in the Calculus Forum
    Replies: 1
    Last Post: February 9th 2009, 04:38 PM

Search Tags


/mathhelpforum @mathhelpforum