1 files changed, 13 insertions, 0 deletions
diff --git a/toolbox.sty b/toolbox.sty
index 7f5738e..5713be0 100644
--- a/toolbox.sty
+++ b/toolbox.sty
@@ -34,6 +34,17 @@
   \@beginparpenalty=\prevparpenalty
 }
 
+%% prevent page breaks after displayed equations
+\newcount\prevpostdisplaypenalty
+\def\nopagebreakaftereq{
+  \prevpostdisplaypenalty=\postdisplaypenalty
+  \postdisplaypenalty=10000
+}
+%% back to previous value
+\def\restorepagebreakaftereq{
+  \postdisplaypenalty=\prevpostdisplaypenalty
+}
+
 %% stack relations in subscript or superscript
 \def\mAthop#1{\displaystyle\mathop{\scriptstyle #1}}
 
@@ -44,3 +55,5 @@
 \def\largearray{\begin{array}{@{}>{\displaystyle}l@{}}\hphantom{\hspace{\largearray@width}}\\[-.5cm]}
 \def\endlargearray{\end{array}}
 
+%% qedsquare
+\def\qed{\penalty10000\hfill\penalty10000$\square$}