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Thread: Meaning/name of mid placed dot at end of equation.

  1. #1
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    Meaning/name of mid placed dot at end of equation.

    Hello,

    I am studying a number if equations relating to engineering and have no idea if this is the right forum I did look around a little bit and attempt to place it correctly. Please forgive me this is the wrong place.

    What is the function of the dot in this equation? Just the name of its function would help.

    Many thanks!


  2. #2
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    It appears to me that you have encountered the end of a sentence.

    Since you have provided no additional context, I can't be certain.
    "Unique Answers Don't Care How You Find Them." - Many may have said it, but I hear it most from me.

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    Quote Originally Posted by tkhunny View Post
    It appears to me that you have encountered the end of a sentence.

    Since you have provided no additional context, I can't be certain.

    Yes, I imagine it looks that way. I had intended to add more when my phone battery barked at me.

    The equation is from the Catenary page on Wikipedia.
    https://en.m.wikipedia.org/wiki/Catenary

    There are other equations on that page using similar notation.

    I entered the equation as written in Grapher and observed the correct result. Removing the period gives a different result.

    If I knew better how to describe it, I might have figured it out. Lol

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    Quote Originally Posted by tkhunny View Post
    It appears to me that you have encountered the end of a sentence.

    Since you have provided no additional context, I can't be certain.

    It sure looks like it might be that simple. I thought it was some sort of differentiation shorthand, but it only appears when the equation is the end of a sentence. Since an equation is usually spaced below to be in its own space, it seems like added typograghy symbols would be left out. That said, a comma doesn’t look out of place in a stream of equations.

    Perhaps a case of thinking too hard. Lol

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    Quote Originally Posted by RBeast View Post
    Yes, I imagine it looks that way. I had intended to add more when my phone battery barked at me.

    The equation is from the Catenary page on Wikipedia.
    https://en.m.wikipedia.org/wiki/Catenary

    There are other equations on that page using similar notation.

    I entered the equation as written in Grapher and observed the correct result. Removing the period gives a different result.

    If I knew better how to describe it, I might have figured it out. Lol
    The next equation on the Wikipedia page is:

    [tex]\displaystyle\frac{d\phi}{ds}=\frac{\cos^2{\phi}}{ a}[/tex]

    which is what you get if you simply ignore the dot.

  6. #6
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    The punctuation apppears to be consistent throughout.

    Note this one: [tex]\dfrac{dy}{dx}=\dfrac{s}{a}[/tex],

    This is not the END of a sentence, but clearly intended to be part of a sentence.

    Read each one carefully. See if the sentence ends or continues. Read above and below. Decide where you would provide what punctuation.
    "Unique Answers Don't Care How You Find Them." - Many may have said it, but I hear it most from me.

  7. #7
    Elite Member stapel's Avatar
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    Cool

    Odd. The coding for the expression actually includes the dot as part of the math:

    Code:
    {\displaystyle \tan \varphi ={\frac {s}{a}}\,.}
    They intentionally added a space after the fraction, and then included the "dot", so it wouldn't appear to have been meant as a sentence-ending full-stop. Sloppiness on the authors' part, maybe...?

  8. #8
    Elite Member mmm4444bot's Avatar
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    I'm thinking the space before all of those periods and commas was an aesthetic decision, and they might have set the punctuation inside the LaTex code to prevent potential line breaks from orphaning the punctuation.
    "English is the most ambiguous language in the world." ~ Yours Truly, 1969

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