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The page https://en.wikipedia.org/wiki/Help:Displaying_a_formula#Subscripts.2C_superscripts.2C_integrals contains the following example: \frac{\sum\limits^{^N}_{k=1} k^2}{a} \bigcap_{i=_1}^n E_i \bigcup_{i=_1}^n E_i Where "N" and "1" are used as sub/sup scripts. I'm not sure what's the intention here, but the rendering does not look good to me and that obviously confuse assistive technologies.