diff --git a/.gitignore b/.gitignore
index 7f46612..e1d1578 100644
--- a/.gitignore
+++ b/.gitignore
@@ -137,3 +137,5 @@ sympy-plots-for-*.tex/
 *.sav
 
 *.pdf
+
+!article.pdf
diff --git a/article.pdf b/article.pdf
new file mode 100644
index 0000000..89381a0
Binary files /dev/null and b/article.pdf differ