fix doc export bugs

LESSON.md

@@ -175,7 +175,7 @@ def variation(parents):
 ```
 
 Is ES convergent?
-If $$#P=1$$, what are the differences with a random walk?
+If $$\#P=1$$, what are the differences with a random walk?
 
 
 Estimation of Distribution Algorithms
@@ -235,6 +235,8 @@ Main models
 > - multi-objectives (cf. Pareto optimality).
 
 ![A diagram with colored points and lines](docs/figures/Pareto_optimality.svg
+)
+
 "Pareto optimality --- (c) Johann Dreo (Yes, I put it on Wikipedia,
 too).")*Two points A and B are said "non-dominated" when they are better than each other
 on one objective f1 or f2, the point C being "dominated". The set of

make_doc.sh

 #!/bin/sh
-pandoc -f gfm --defaults docs/config_pdf.yaml -o LESSON.pdf LESSON.md
-
+pandoc --defaults docs/config_pdf.yaml --webtex --pdf-engine=xelatex -o LESSON.pdf LESSON.md