Mathematics is a beautiful subject, but when it comes to formatting mathematical equations in digital documents, things can quickly get messy. That's where KaTeX comes in - a fast and lightweight JavaScript library that makes it easy to typeset mathematical equations in web applications. In this article, we'll introduce you to the basics of KaTeX and show you how to create beautifully formatted mathematical expressions.

First, let's take a look at what KaTeX is. KaTeX is a JavaScript library that allows you to typeset mathematical expressions in your web application. It's designed to be fast and lightweight, which means that it won't slow down your website's performance. With KaTeX, you can easily include mathematical symbols, equations, and formulas in your web pages.

To get started with KaTeX, you'll need to include the library in your web page. You can download the library from the KaTeX website, or you can use a CDN like this:

```
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/katex.min.js"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/katex.min.css" integrity="sha384-kDbU6CZU6MWxUkrWzBq3znPt0i21d5PY5bqj3iGKP7H+kbOxLgdtVvzfaZZRy8VY" crossorigin="anonymous">
```

Once you've included the library, you can start creating mathematical expressions in your web page. To create an expression, simply wrap it in the `katex`

command, like this:

```
<p>The Pythagorean theorem states that in a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides, or:</p>
<p>$$c^2 = a^2 + b^2$$</p>
```

In this example, we're using the `katex`

command to typeset the Pythagorean theorem. The equation is enclosed in double dollar signs, which tells KaTeX to render the expression as a block element.

You can also use KaTeX to create inline mathematical expressions, like this:

```
<p>The slope of a line can be calculated using the equation $$m = \frac{\Delta y}{\Delta x}$$ where $\Delta y$ is the change in the vertical direction and $\Delta x$ is the change in the horizontal direction.</p>
```

In this example, we're using the `katex`

command to typeset an inline equation. The equation is enclosed in single dollar signs, which tells KaTeX to render the expression as an inline element.

KaTeX supports a wide range of mathematical symbols and functions, so you can create complex equations with ease. You can find a full list of supported symbols and functions in the KaTeX documentation.

In conclusion, KaTeX is a powerful tool for typesetting mathematical expressions in web applications. With its fast and lightweight design, it's a great choice for anyone looking to include math in their website or application. So why not give it a try and take your math to the next level?