Dealing with Incorrect Formulas
Print errors in formulas are represented by the <choice> element. The formula is always completely in the <sic> element (erroneous original) respectively in the <corr> element (corrected transcription).
<choice>
<sic><formula notation="[notation]">[incorrect formula according to the original]</formula></sic>
<corr><formula notation="[notation]">[corrected transcription of the formula]</formula></corr>
</choice>
Dealing with Incorrect Formulas
<choice>
<sic>
<formula notation="TeX">\frac{3 \cdot 015}{3 - 0{,}15}</formula>
</sic>
<corr>
<formula notation="TeX">\frac{3 \cdot 0{,}15}{3 - 0{,}15}</formula>
</corr>
</choice>
Source: Siemens, Werner von: Gesammelte Abhandlungen und Vorträge. Berlin, 1881. [Facsimile 208]