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## Main Question or Discussion Point

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

[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