The EricaAlbright.com is a hoax web site. It is just someone trying to get attention on the Internet with a "famous" name. Erica Albright is a fictitious person created for the sake of drama, because movies need a romantic plot to make them more interesting to some audience.

Was Erica Albright real?
I would like to know what is the latex command to include a double lower index using sigma notation (i.e: second index lies underneath the first index)?

I tried typing:

\displaystyle\sum_{m,n=-\infty, \; (m,n)\neq (0,0)}^{\infty}
\left[
  \frac{1}{(z-2 m\omega_{1} - 2 n\omega_{2})^{2}}
 -\frac{1}{   4(m\omega_{1} +   n\omega_{2})^{2}}
\right] 


I would appreciate the assistance. Thanks
