my problem is, that my formula appears to be correct but produces 6 warnings. I don't find any useful help in internet and hope somebody here could tell me what my mistake ist. Here is the code:
Code: Select all
\begin{equation}
\delta^{18}O\ [\text\textperthousand]= \frac{(\delta^{18}O⁄\delta^{16}O)_{sample}-(\delta^{18}O⁄\delta^{16}O)_{standard}}{(\delta^{18}O⁄\delta^{16}O)_{standard}}\times1000
\label{DeltaNotation18O}
\end{equation}
