Update to v0.1:

Fixed: removed discussion on k-nearest neighbor exclusion models which do
not cover the lattice perfectly.

Fixed: extra assumption: particle configurations are determined by their
defects.

Fixed: miscellaneous minor tweaks, formatting and typos.

Added: discussion about Lee-Yang zeros and their relation to the
high-fugacity expansion.

Added: open problem: soft exclusion potentials.

Added: extended bibliography.

Changed: Particles in figures are now always centered on the lattice, not
the dual lattice.

Changed: improved Makefile.

figs/libs/shapes.sty

@@ -12,24 +12,38 @@
 % cross (color #1, position #2)
 \def\cross#1#2{
   \fill[color=#1]#2++(0.5,0.5)--++(0,1)--++(-1,0)--++(0,-1)--++(-1,0)--++(0,-1)--++(1,0)--++(0,-1)--++(1,0)--++(0,1)--++(1,0)--++(0,1)--++(-1,0);
+  \begin{scope}
+    \clip#2++(0.5,0.5)--++(0,1)--++(-1,0)--++(0,-1)--++(-1,0)--++(0,-1)--++(1,0)--++(0,-1)--++(1,0)--++(0,1)--++(1,0)--++(0,1)--++(-1,0);
+    \grid44{[color=white]#2++(-2,-2)}
+  \end{scope}
   \draw[color=black]#2++(0.5,0.5)--++(0,1)--++(-1,0)--++(0,-1)--++(-1,0)--++(0,-1)--++(1,0)--++(0,-1)--++(1,0)--++(0,1)--++(1,0)--++(0,1)--++(-1,0);
 }
 
-
 % 1x1 square (color #1, position #2)
 \def\square#1#2{
   \fill[color=#1]#2++(-0.5,-0.5)--++(0,1)--++(1,0)--++(0,-1)--cycle;
   \draw[color=black]#2++(-0.5,-0.5)--++(0,1)--++(1,0)--++(0,-1)--cycle;
+  \draw[color=white]#2++(-0.5,0)--++(1,0);
+  \draw[color=white]#2++(0,-0.5)--++(0,1);
 }
 
 % 2x2 square (color #1, position #2)
 \def\ttsquare#1#2{
   \fill[color=#1]#2++(-1,-1)--++(0,2)--++(2,0)--++(0,-2)--cycle;
   \draw[color=black]#2++(-1,-1)--++(0,2)--++(2,0)--++(0,-2)--cycle;
+  \draw[color=white]#2++(-1,0)--++(2,0);
+  \draw[color=white]#2++(0,-1)--++(0,2);
+}
+\def\ttsquareempty#1{
+  \draw[color=black]#1++(-1,-1)--++(0,2)--++(2,0)--++(0,-2)--cycle;
 }
 
 % diamond (color #1, position #2)
 \def\diamond#1#2{
   \fill[color=#1]#2++(0,-1)--++(1,1)--++(-1,1)--++(-1,-1)--cycle;
+  \begin{scope}
+    \clip#2++(0,-1)--++(1,1)--++(-1,1)--++(-1,-1)--cycle;
+    \grid22{[color=white]#2++(-1,-1)}
+  \end{scope}
   \draw[color=black]#2++(0,-1)--++(1,1)--++(-1,1)--++(-1,-1)--cycle;
 }