thething: Backslash notation

text/problem/thething/solution.tex

@@ -22,7 +22,7 @@ Consequently, at each timestamp we protect every {\thething}, while reserving a
 
 \paragraph{\texttt{Skip}}
 One might argue that we could skip the {\thething} data releases as we demonstrate in Figure~\ref{fig:lmdk-skip}, by republishing previous, regular event releases.
-This would result in preserving all of the available privacy budget for regular events, equivalently to event-level protection, i.e.,~$\varepsilon_i = \varepsilon$, $\forall i \in T /\ L$.
+This would result in preserving all of the available privacy budget for regular events, equivalently to event-level protection, i.e.,~$\varepsilon_i = \varepsilon$, $\forall i \in T \setminus L$.
 
 \begin{figure}[htp]
   \centering