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5

I don't think you have a much better option than this. Btw, you seem to use q_A for two different things. \documentclass[twocolumn]{ltxdoc} \usepackage{amsmath} \begin{document} $$\sum_{q_\mathrm{tot}=0}^{Q_A+Q_B-2}\sum_{q_A=0}^{q_\mathrm{tot}}{\textstyle\binom{Q_A-1}{q_A}\binom{Q_B-1}{q_B}}x^{q_\mathrm{tot}},$$ where ...

3

The cuted package (from the sttools bundle) can temporarily leave two columns mode with its strip environment. An example with the equation entered in the second column: \documentclass[twocolumn]{ltxdoc} \usepackage{mathtools, cuted} \usepackage{lipsum, color} \begin{document} \lipsum[1-2] \lipsum[1] \textsf{\color{red}Equation entered here: } ...

3

The problem is in the order with which you load the packages: stfloats (assuming you really want to use it) should go before fixltx2e or the float will disappear. I get no error from your minimal example, however, only the disappearance of the float. Note however that \ifCLASSINFOpdf \usepackage[pdftex]{graphicx} \else \fi is useless; just do ...

3

Resizebox should work. \documentclass[twocolumn]{ltxdoc} \usepackage{amsmath} \usepackage{lipsum} \usepackage{graphics} \begin{document} \lipsum[1] ...

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