pngmath and mathjax at same time
During "sphinx-quickstart" command execution I've said "yes" to both png and mathjax. I've got a reply saying that only mathjax will be installed but in the produced "conf.py" I see both of them.
Add any Sphinx extension module names here, as strings. They can be extensions
coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
extensions = ['sphinx.ext.pngmath', 'sphinx.ext.mathjax']