Output two sumation signs in equal height in Word 2010

[aschilling]

Hi everybody,

I am opening this issue after posting it already on the mailinglist (https://groups.google.com/forum/#!topic/pandoc-discuss/6zF_q_K4uok).

I need to output some complex equations in Word 2010 (docx). To do so I write the equations in tex and use pandoc to translate them as Word formulas.

However I found that if I use the following tex equation:

\sum_{m=1}^\infty\sum_{n=1}^\infty

In Word the resulting two summation signs are not of the same size but the latter is smaler than the first one. Is this a bug? I found no appropriate workaround to solve this?

Thank you in advance

[jgm]

It's really an issue with the texmath library (https://github.com/jgm/texmath).
The issues seems to be that the second summation is included in a group with the first, rather than being coordinate with it. I see a place in the code where this is done, and it's clear that it's being done for a reason -- texmath doesn't do this in MathML. However, even though I wrote the code, I no longer recall the reason. Probably the thing to do is create the formula using Word's equation editor, then look at the OMML code in the docx container. Hopefully that would tell me how to render this correctly.

[jgm]

Here is what Word produced when I tried the equation editor:

  <m:oMathPara>
    <m:oMath>
      <m:nary>
        <m:naryPr>
          <m:chr m:val="∑" />
          <m:limLoc m:val="undOvr" />
          <m:ctrlPr>
            <w:rPr>
              <w:rFonts w:ascii="Cambria Math"
              w:hAnsi="Cambria Math" />
              <w:i />
            </w:rPr>
          </m:ctrlPr>
        </m:naryPr>
        <m:sub>
          <m:r>
            <w:rPr>
              <w:rFonts w:ascii="Cambria Math"
              w:hAnsi="Cambria Math" />
            </w:rPr>
            <m:t>m=1</m:t>
          </m:r>
        </m:sub>
        <m:sup>
          <m:r>
            <w:rPr>
              <w:rFonts w:ascii="Cambria Math"
              w:hAnsi="Cambria Math" />
            </w:rPr>
            <m:t>2</m:t>
          </m:r>
        </m:sup>
        <m:e>
          <m:nary>
            <m:naryPr>
              <m:chr m:val="∑" />
              <m:limLoc m:val="undOvr" />
              <m:ctrlPr>
                <w:rPr>
                  <w:rFonts w:ascii="Cambria Math"
                  w:hAnsi="Cambria Math" />
                  <w:i />
                </w:rPr>
              </m:ctrlPr>
            </m:naryPr>
            <m:sub>
              <m:r>
                <w:rPr>
                  <w:rFonts w:ascii="Cambria Math"
                  w:hAnsi="Cambria Math" />
                </w:rPr>
                <m:t>m=1</m:t>
              </m:r>
            </m:sub>
            <m:sup>
              <m:r>
                <w:rPr>
                  <w:rFonts w:ascii="Cambria Math"
                  w:hAnsi="Cambria Math" />
                </w:rPr>
                <m:t>2</m:t>
              </m:r>
            </m:sup>
            <m:e>
              <m:r>
                <w:rPr>
                  <w:rFonts w:ascii="Cambria Math"
                  w:hAnsi="Cambria Math" />
                </w:rPr>
                <m:t>x</m:t>
              </m:r>
            </m:e>
          </m:nary>
        </m:e>
      </m:nary>
    </m:oMath>
  </m:oMathPara>

[jgm]

Culprit was the <m:grow />. I've fixed this in texmath. If you are desperate for the change you can install texmath from github source (cabal install --force will be needed), then reinstall pandoc (cabal install pandoc). But the fix will be in the next texmath release.