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In a paper says that the limit when [tex]\alpha \to 0[/tex] with [tex]

  1. Aug 14, 2011 #1
    In a paper says that the limit when [tex]\alpha \to 0[/tex] with [tex] \sigma = \pm 1 [/tex] of:

    [tex]\frac{1}{4 \alpha}(1 + \sigma \sqrt{1 - \frac{8}{l^2} \alpha } )[/tex]

    has a well defined limit only when [tex] \sigma = - 1 [/tex],

    ¿why???????...I don't understand
     
  2. jcsd
  3. Aug 14, 2011 #2

    disregardthat

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    Science Advisor

    Re: limit

    Well, calculate the limit for sigma = -1, and see what happens when sigma = 1 (try to calculate it).
     
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