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--- misc [2015/10/17 18:48] – external edit 127.0.0.1
+++ misc [2022/02/22 09:01] – [another statement] potthast
@@ Line 9: / Line 9: @@
   where you can quickly type some ideas in LaTeX and the other
   person with internet connection can read it ...
+==== Maths Notation ====
+$$
+\frac{dx'}{dt}(\rho,t)\Big|_{t=0} = 0   \hspace{3cm} (3.4)
+$$
 ==== Talk Data Assimilation ====
@@ Line 292: / Line 298: @@
 [[misc2]][[feglt]]
+\begin{eqnarray}
+\tilde{Y}^{T} \tilde{R}^{-1} \tilde{Y} & = &  Y^{T} A^{T} (A R A^{T})^{-1} A Y \nonumber \\
+& = & Y^{T} A^{T} (A^{T})^{-1} R^{-1} A^{-1} A Y \nonumber \\
+& = & Y^{T} R^{-1} Y
+\end{eqnarray}