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Is y'(x) acceptable notation?

  1. Oct 21, 2011 #1
    This is just me being pedantic :)
     
  2. jcsd
  3. Oct 21, 2011 #2

    Mark44

    Staff: Mentor

    I don't see anything wrong with it.
     
  4. Oct 21, 2011 #3

    Dick

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    Acceptable notation for what?
     
  5. Oct 21, 2011 #4

    Mark44

    Staff: Mentor

    That thought occurred to me as well.
     
  6. Oct 21, 2011 #5

    symbolipoint

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    Unclear. What is y ? What is y(x) ? What is y'(x)?

    The apostrophe mark may mean either, "the other specified...", or it may mean, "first derivative of...".

    If you are giving your function the variable name of y(x), then most likely one would use y'(x) to mean, the first derivative of y(x) with respect to x.
     
  7. Oct 21, 2011 #6

    Fredrik

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    I don't see anything wrong with y'(x), but I guess it depends on whether you had something non-standard in mind.

    I have never been a fan of calling y(x) a function. y is the function. y(x) is a number in the range of y. y' is the derivative of y. y'(x) is the value of y' at x, and also the derivative of y at x.
     
    Last edited: Oct 22, 2011
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