Added fixes to errors found by Deepro

50004 - Operating Systems/Lecture 11 - (Memory Management)/Lecture 11.tex

@@ -88,7 +88,7 @@ \subsection*{Working Set Model}
 	\compenum{
 	\item Calculate age.
 	\item If $age < w$ (working set age) continue (page is in working set).
-	\item If $age > w$, if page clean, replace, else write back and replace.
+	\item If $age > w$, if page clean, replace, else start write back and continue to find another page (once the write-back of the frame is complete the page is marked as free \& clean - we dont want to halt while waiting for the page to be written back to disk)
 	      }
 	      }
 \end{enumerate}

50006 - Compilers/(Prof Kelly) Lecture 7 - (Loop Optimisations)/(Prof Kelly) Lecture 7.tex

@@ -117,7 +117,7 @@ \subsection*{Hoisting Instructions}
 	}
 	\bullpara{There can only be one definition of $t$}{\\ Count the definitions.}
 	\bullpara{$t$ cannot be liveout from the loop's pre-header}{
-		\\ If $t$ is live out from the pre-header, it means that $t$ is used somewhere in the loop, and $t$ is also defined in the loop. Hence we cannot hoist it.
+		\\ If $t$ is live out from the pre-header, it means that $t$ is used somewhere in the loop ($t$ is also defined in the loop), or the value of $t$ from the pre-header is used after the loop (e.g a while loop when no iterations are run). Hence we cannot hoist it.
 		Use \keyword{live range} analysis for this.
 	}
 }