texmath-0.6.7: tests/writers/06.tex
{\sum }_{{m}=1}^{\infty }{\sum }_{{n}=1}^{\infty }\frac{{{m}}^{2} \,{n}}{{3}^{{m}}\left({m} \,{3}^{{n}}+{n} \,{3}^{{m}}\right)} {\sum }_{{m}=1}^{\infty }{\sum }_{{n}=1}^{\infty }\frac{{{m}}^{2} \,{n}}{{3}^{{m}}\left({m} \,{3}^{{n}}+{n} \,{3}^{{m}}\right)}