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Int (1/dx)

  1. Aug 5, 2010 #1
    How do I solve this integral?

    [tex]
    \int \frac{1}{dx}
    [/tex]
     
  2. jcsd
  3. Aug 5, 2010 #2

    vela

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    You can't. Did you by chance mean

    [tex]\int \frac{1}{x}\,dx[/tex]
     
  4. Aug 5, 2010 #3
    Hi dear

    I mean:
    [tex]
    \int \frac{1}{dx}
    [/tex]
     
  5. Aug 5, 2010 #4

    vela

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    That expression doesn't make sense. Where did it come from?
     
  6. Aug 5, 2010 #5
    I encounter with this, when I am solving a problem.
     
  7. Aug 5, 2010 #6

    HallsofIvy

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    Then please give the entire problem. As vela said,
    [tex]\int \frac{1}{dx}[/tex]
    simply doesn't mean anything.
     
  8. Aug 5, 2010 #7
    So Sorry, I am not able to explain it.
     
  9. Aug 5, 2010 #8

    Char. Limit

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    Well, since [itex]\int dx[/tex] means a sum ([itex]\int[/itex]) of an uncountably large amount of infinitesimally small numbers (dx's)...

    and since, if dx is infinitesimally small, 1/dx would be uncountably large...

    Then [itex]\int \frac{1}{dx}[/itex] means a sum of an uncountably large amount of uncountably large numbers...

    and so is uncountably large itself.
     
  10. Aug 5, 2010 #9

    Hurkyl

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    Ugh, first the opening poster won't go into where she got the expression so we can point out what she did wrong, but now people are giving her questionable advice. :frown:

    Thread closed.
     
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