Merge pull request #171 from leungbk/gc-typo

book.tex

@@ -14846,7 +14846,7 @@ \section{Challenge: Generational Collection}
 time proportional to all the live data. One way to reduce this
 overhead is to reduce how much data is inspected in each call to
 \code{collect}. In particular, researchers have observed that recently
-allocated data is more likely to become garbage then data that has
+allocated data is more likely to become garbage than data that has
 survived one or more previous calls to \code{collect}. This insight
 motivated the creation of \emph{generational garbage collectors}
 \index{subject}{generational garbage collector} that