diff --git a/content/post/2017-03-05-math-sample.md b/content/post/2017-03-05-math-sample.md
index 8ecf666..3108021 100644
--- a/content/post/2017-03-05-math-sample.md
+++ b/content/post/2017-03-05-math-sample.md
@@ -5,12 +5,18 @@ date: 2017-03-05
 tags: ["example", "math"]
 ---
 
-KaTeX can be used to generate complex math formulas server-side. 
+KaTeX can be used to generate complex math formulas. It supports in-line math using the `\\( ... \\)` delimiters, like this: \\( E = mc^2 \\). By default, it does *not* support in-line delimiters `$...$` because those occur too commonly in typical webpages. It supports displayed math using the `$$` or `\\[...\\]` delimiters, like this:
 
+Formula 1:
 $$
 \phi = \frac{(1+\sqrt{5})}{2} = 1.6180339887\cdots
 $$
 
+Formula 2: (same formula, different delimiter)
+\\[
+\phi = \frac{(1+\sqrt{5})}{2} = 1.6180339887\cdots
+\\]
+
 Additional details can be found on [GitHub](https://github.com/Khan/KaTeX) or on the [Wiki](http://tiddlywiki.com/plugins/tiddlywiki/katex/).
 <!--more-->
 
@@ -33,10 +39,10 @@ $$
 \frac{1}{\Bigl(\sqrt{\phi \sqrt{5}}-\phi\Bigr) e^{\frac25 \pi}} = 1+\frac{e^{-2\pi}} {1+\frac{e^{-4\pi}} {1+\frac{e^{-6\pi}} {1+\frac{e^{-8\pi}} {1+\cdots} } } }
 $$
 ```
-​​$$
+$$
 \frac{1}{\Bigl(\sqrt{\phi \sqrt{5}}-\phi\Bigr) e^{\frac25 \pi}} = 1+\frac{e^{-2\pi}} {1+\frac{e^{-4\pi}} {1+\frac{e^{-6\pi}} {1+\frac{e^{-8\pi}} {1+\cdots} } } }
 $$
-​​ 
+
 
 ### Example 3
 ```
@@ -47,3 +53,19 @@ $$
 $$
 1 +  \frac{q^2}{(1-q)}+\frac{q^6}{(1-q)(1-q^2)}+\cdots = \prod_{j=0}^{\infty}\frac{1}{(1-q^{5j+2})(1-q^{5j+3})}, \quad\quad \text{for }\lvert q\rvert<1.
 $$
+
+### Example 4
+
+Remember, certain characters are rendered by markdown, so you may need to workaround those issues. You can find the complete list of KaTeX supported functions here: [https://khan.github.io/KaTeX/docs/supported.html](https://khan.github.io/KaTeX/docs/supported.html)
+
+For example, the `'` character can  be replaced with `^\prime`:
+
+$$
+G^\prime = G - u
+$$
+
+The `"` character can  be replaced with `^{\prime\prime}`:
+
+$$
+G^{\prime\prime} = G^\prime - v
+$$