add mathjax

_config.yml

@@ -13,19 +13,17 @@
 # you will see them accessed via {{ site.title }}, {{ site.email }}, and so on.
 # You can create any custom variable you would like, and they will be accessible
 # in the templates via {{ site.myvariable }}.
-title: Your awesome title
-email: [email protected]
+title: Notes for machine learning
+email: hikihomori at gmail
 description: >- # this means to ignore newlines until "baseurl:"
-  Write an awesome description for your new site here. You can edit this
-  line in _config.yml. It will appear in your document head meta (for
-  Google search results) and in your feed.xml site description.
+  Notes for machine learning and math
 baseurl: "" # the subpath of your site, e.g. /blog
 url: "" # the base hostname & protocol for your site, e.g. http://example.com
-twitter_username: jekyllrb
-github_username:  jekyll
+twitter_username: hikihomori
+github_username:  dongjk
 
 # Build settings
-markdown: kramdown
+markdown: redcarpet
 theme: minima
 plugins:
   - jekyll-feed

_includes/mathjax.html

@@ -0,0 +1 @@
+<script src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML" type="text/javascript"></script>

_layouts/page.html

@@ -0,0 +1,3 @@
+<script type="text/javascript"
+    src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
+</script>

_posts/2018-02-22-welcome-to-jekyll.markdown

@@ -4,6 +4,7 @@ title:  "Welcome to Jekyll!"
 date:   2018-02-22 02:25:50 -0800
 categories: jekyll update
 ---
+{% include mathjax.html %}
 You’ll find this post in your `_posts` directory. Go ahead and edit it and re-build the site to see your changes. You can rebuild the site in many different ways, but the most common way is to run `jekyll serve`, which launches a web server and auto-regenerates your site when a file is updated.
 
 To add new posts, simply add a file in the `_posts` directory that follows the convention `YYYY-MM-DD-name-of-post.ext` and includes the necessary front matter. Take a look at the source for this post to get an idea about how it works.
@@ -18,6 +19,19 @@ print_hi('Tom')
 #=> prints 'Hi, Tom' to STDOUT.
 {% endhighlight %}
 
+$$
+M = \left( \begin{array}{ccc}
+x_{11} & x_{12} & \ldots \\
+x_{21} & x_{22} & \ldots \\
+\vdots & \vdots & \ldots \\
+\end{array} \right)
+$$
+
+$$
+
+\text{argmax}_{C_i} P(C_i)P(D|C_i)
+$$
+
 Check out the [Jekyll docs][jekyll-docs] for more info on how to get the most out of Jekyll. File all bugs/feature requests at [Jekyll’s GitHub repo][jekyll-gh]. If you have questions, you can ask them on [Jekyll Talk][jekyll-talk].
 
 [jekyll-docs]: https://jekyllrb.com/docs/home