fixed typo in temporal 0006 sol

temporal_logic/0006_sol.tex

@@ -1,12 +1,12 @@
 We use the following Boolean variables:
 \begin{itemize}
     \item $a$ represents ``The robot visits region A''
-    \item $b$ represents ``The robot visits region B''    
-    \item $c$ represents ``The robot visits region C''  
+    \item $b$ represents ``The robot visits region B''
+    \item $c$ represents ``The robot visits region C''
 \end{itemize}
 
 \begin{itemize}
-    \item $\varphi_1 \coloneqq E(GF a \wedge GF c)$
-    \item $\varphi_2 \coloneqq A (GF a \wedge FG \neg c)$
-    \item $\varphi_3 \coloneqq A (GF a \rightarrow GF c)$
-\end{itemize}
+    \item $\varphi_1 \coloneqq E(GF a \land GF c)$
+    \item $\varphi_2 \coloneqq A (GF a \land GF c)$
+    \item $\varphi_3 \coloneqq A (GF a \imp FG \neg c)$
+\end{itemize}