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--- documentation:language_reference:functions:operatorsettrace [2018/09/25 13:40] – created Simon Heinze
+++ documentation:language_reference:functions:operatorsettrace [2018/09/26 13:00] – disclaimer Simon Heinze
@@ Line 2: / Line 2: @@
 ###
-alligned paragraph text
+OperatorSetTrace($O$, $t$, {$i_1,...,i_n$}) takes an Operator $O$, an optional real value $t$ for the trace and an optional list {$i_1,...,i_n$} of included orbitals, and sets the trace of these orbitals to $t$. It furthermore sets any scalar offset of the operator to 0 (or rather will, with the next update). If no list of indices is given the function includes all orbitals up to the number of fermionic states, and if no value $t$ is given the trace is set to 0.
+After the operation the operator has the property
+\begin{equation*}
+\sum_{j=\{i_1,...,i_n\}}
+O_{jj}
+=
+t
+\hspace{0.3cm}
+,
+\end{equation*}
+where $O_{jj}$ are the prefactors of the diagonal quadratic terms of the operator,
+\begin{equation*}
+O
+=
+\sum_{i,j}
+O_{ij} a_i^\dagger a_j^{\phantom{\dagger}}
++
+...
+\hspace{0.3cm}
+.
+\end{equation*}
 ###
 ===== Input =====
-  * bla : Integer
+  * $O$ : Operator
-  * bla2 : Real
+  * $t$ : New value of the trace (Default 0)
+  * {$i_1,...,i_n$} : List of indices (Default {$0,...,N_{Fermi}-1$})
 ===== Output =====
-  * bla : real
+  * $O^\prime$ : Operator with newly set trace
 ===== Example =====
 ###
-description text
+Give me just a minute.
 ###