<head>

{% if site.google_analytics != "" %}
  {% include ga.html %}
  <script type="text/javascript" src="{{ '/assets/js/analytics.js' }}"></script>
{% endif %}
{% if site.mathjax == "enable" %}
<script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script>
<script id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>
{% endif %}
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
{% seo %}
<link rel="stylesheet" href="{{ '/assets/css/main.css' | relative_url }}">

</head>