informalequation
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This is an alpha version of this book.

# informalequation

## Name

informalequation — A displayed mathematical equation without a title

##

# Synopsis

### Content Model

    informalequation ::=
    ((alt?,
      (graphic+|mediaobject+)))

### Attributes

Common attributes

### Parameter Entities

The following parameter entities contain informalequation:

Parameter Entities
`%admon.mix;` | `%bookcomponent.content;` | `%component.mix;`
`%divcomponent.mix;` | `%example.mix;` | `%figure.mix;`
`%footnote.mix;` | `%glossdef.mix;` | `%indexdivcomponent.mix;`
`%informal.class;` | `%para.mix;` | `%qandaset.mix;`
`%refcomponent.mix;` | `%revdescription.mix;` | `%sidebar.mix;`

## Description

An `InformalEquation` is usually a mathematical equation or a group of related mathematical equations.

### Processing expectations

Formatted as a displayed block.

### Parents

These elements contain informalequation: `answer`, `appendix`, `article`, `bibliodiv`, `bibliography`, `blockquote`, `callout`, `caution`, `chapter`, `constraintdef`, `equation`, `example`, `figure`, `footnote`, `glossary`, `glossdef`, `glossdiv`, `important`, `index`, `indexdiv`, `informalexample`, `informalfigure`, `listitem`, `msgexplan`, `msgtext`, `note`, `para`, `partintro`, `preface`, `procedure`, `qandadiv`, `qandaset`, `question`, `refsect1`, `refsect2`, `refsect3`, `refsynopsisdiv`, `revdescription`, `sect1`, `sect2`, `sect3`, `sect4`, `sect5`, `section`, `setindex`, `sidebar`, `simplesect`, `step`, `tip`, `warning`.

### Children

The following elements occur in informalequation: `alt`, `graphic`, `mediaobject`.

## See Also

`equation`, `example`, `figure`, `informalexample`, `informalfigure`, `informaltable`, `inlineequation`, `subscript`, `superscript`, `table`.

## Examples

    <!DOCTYPE para PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
              "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">
    <para>
    The equation
    <informalequation>
      <alt>e^(pi*i) + 1 = 0</alt>
      <graphic fileref="figures/epi10"></graphic>
    </informalequation>
    is delightful because it joins together five of the most
    important mathematical constants.
    </para>

The equation

is delightful because it joins together five of the most important mathematical constants.

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