>> <script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax... type="text/javascript"></script>
Mathjax is usefull to add formulas, specially in pages with a lot of integrals, square roots or matrices. In this case it's a too powerful tool, but I guess that the author just uses it in every article.
>> <script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax... type="text/javascript"></script>
Mathjax is usefull to add formulas, specially in pages with a lot of integrals, square roots or matrices. In this case it's a too powerful tool, but I guess that the author just uses it in every article.