<head>

<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">

<title>{% if page.title %}{{ page.title | append: " - " | append: site.title | escape }}{% else %}{{ site.title | escape }}{% endif %}</title>
<meta name="description" content="{{ page.excerpt | default: site.description | strip_html | normalize_whitespace | truncate: 160 | escape }}">

{% assign v = site.time | date: "%Y%m%d%H%M%S" %}
<link rel="stylesheet" href="{{ "/assets/styles/core.css?v=" | append: v | relative_url }}">
<link rel="stylesheet" href="{{ "/assets/styles/fontello.css?v=" | append: v | relative_url }}">
<link rel="stylesheet" href="{{ page.color_scheme | default: site.color_scheme | default: "default" | prepend: "/assets/styles/highlighting/" | append: ".css?v=" | append: v | relative_url }}">

<link rel="canonical" href="{{ page.url | replace:'index.html','' | absolute_url }}">
<link rel="alternate" type="application/rss+xml" title="{{ site.title | escape }}" href="{{ "/feed.xml" | relative_url }}">

{% if page.mathjax or site.mathjax %}
<script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js?config=TeX-AMS-MML_HTMLorMML" type="text/javascript"></script>
<style>.MathJax_ExBox { font-family: serif; }</style>
{% endif %}

{% if jekyll.environment == 'production' and site.google_analytics %}
{% include google-analytics.html %}
{% endif %}

</head>