src/pyafm/main.tex: Add missing em-dash in Whitehead epigraph

diff --git a/src/pyafm/main.tex b/src/pyafm/main.tex
index 23843c6228abc65cbf0f0dfbf6b7597c2f713681..964e0e783b3bf82b3d86a1ec4c9f4d8fd41af46b 100644 (file)
--- a/src/pyafm/main.tex
+++ b/src/pyafm/main.tex
@@ -3,9 +3,9 @@
 
 \epigraph{Civilization advances by extending the number of important
   operations which we can perform without thinking about
-  them. Operations of thought are like cavalry charges in a battle
-  they are strictly limited in number, they require fresh horses, and
-  must only be made at decisive moments.}{Alfred North
+  them. Operations of thought are like cavalry charges in a
+  battle---they are strictly limited in number, they require fresh
+  horses, and must only be made at decisive moments.}{Alfred North
   Whitehead\citep{whitehead11}}
 
 Velocity clamp experiments have been carried out since the initial