Merge pull request #2186 from xuhdev/amsfonts

Fix LaTeX output of \mathbb in math

sphinx/ext/mathbase.py

@@ -214,3 +214,4 @@ def setup_math(app, htmlinlinevisitors, htmldisplayvisitors):
     app.add_role('eq', eq_role)
     app.add_directive('math', MathDirective)
     app.connect('doctree-resolved', number_equations)
+    app.add_latex_package('amsfonts')

tests/root/math.txt

@@ -19,4 +19,8 @@ This is inline math: :math:`a^2 + b^2 = c^2`.
 
    e^{ix} = \cos x + i\sin x
 
+.. math::
+
+   n \in \mathbb N
+
 Referencing equation :eq:`foo`.