[AMR] Notes in various sections

electives/amr/parts/00_basics/03_error-propagation.tex

@@ -1,4 +1,5 @@
 \subsection{Error Propagation}
 \label{sec:error-propagation}
 For functions $\vec{f}(\vec{x}) = \mat{A}\vec{x}$, the \bi{linear error propagation}
-is given by $\Sigma^f = A \Sigma^x A^\top$, with $\Sigma^x$ the uncertanty of $\vec{x}$ (covariance mat.)
+is given by $\Sigma^f = A \Sigma^x A^\top$, with $\Sigma^x$ the uncertanty of $\vec{x}$ (covariance mat.), typically $\texttt{diag}(\sigma^2)$,
+with $\sigma^2$ the variance of all variables involved