use https://github.com/nunocoracao/blowfish.git

themes/blowfish/exampleSite/content/samples/mathematical-notation/index.md

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+---
+title: Mathematical notation
+date: 2019-03-08
+description: A brief sample of mathematical notation in Blowfish.
+tags: ["sample", "katex", "maths", "shortcodes"]
+type: 'sample'
+---
+
+KaTeX can be used to render mathematical notation within articles.
+
+<!--more-->
+
+{{< katex >}}
+
+Blowfish will only bundle the KaTeX assets into your project if you make use of mathematical notation. In order for this to work, simply include the [`katex` shortcode]({{< ref "docs/shortcodes#katex" >}}) within the article. Example below:
+
+```md
+{{</* katex */>}}
+```
+Any KaTeX syntax on that page will then be automatically rendered. Use the online reference of [supported TeX functions](https://katex.org/docs/supported.html) for the available syntax.
+
+## Inline notation
+
+Inline notation can be generated by wrapping the expression in `\\(` and `\\)` delimiters.
+
+**Example:**
+
+```tex
+% KaTeX inline notation
+Inline notation: \\(\varphi = \dfrac{1+\sqrt5}{2}= 1.6180339887…\\)
+```
+
+Inline notation: \\(\varphi = \dfrac{1+\sqrt5}{2}= 1.6180339887…\\)
+
+## Block notation
+
+Alternatively, block notation can be generated using `$$` delimiters. This will output the expression in its own HTML block.
+
+**Example:**
+
+```tex
+% KaTeX block notation
+$$
+ \varphi = 1+\frac{1} {1+\frac{1} {1+\frac{1} {1+\cdots} } }
+$$
+```
+
+$$
+ \varphi = 1+\frac{1} {1+\frac{1} {1+\frac{1} {1+\cdots} } }
+$$