##

9.4.5 Fractions

Fractions are created using the command

The `amsmath` package also provides the command

which is designed for continued fractions. The optional argument
`pos` can be used for left (`l`) or right (`r`)
placement of any of the numerators. (The default is centred.)

**Example:**

A simple fraction:

Produces:

which produces:

**Example (Nested):**

**Example (Continued Fraction);**

A continued fraction (example taken from `amsmath`
documentation and uses `\sqrt`

, described in §9.4.6. Roots,
and `\dotsb`

, described in
§9.4.7. Mathematical Symbols):

**Example (A Derivative):**

The above example is rather cumbersome, particularly if you have a lot of derivatives, so it might be easier to define a new command. In the preamble define:

Then in the document:

**Example (Partial Derivative):**

Partial derivatives can be obtained similarly
using the command `\partial`

to display the partial
derivative symbol. As in the previous example, first define a new
command to format a partial derivative in the
preamble:

Then in the document:

**Example (Double Partial Derivative):**

**Example (First principles):**

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