equation
equation — A displayed mathematical equation.
Synopsis
equation ::=
Additional Constraints
- example must not occur among the children or descendants of equation
- figure must not occur among the children or descendants of equation
- table must not occur among the children or descendants of equation
- equation must not occur among the children or descendants of equation
- If this element is the root element, it must have a version attribute.
Description
An equation is a formal mathematical equation
(with an optional rather than a required title).
If the MathML Module is used, equation can also
contain the mml:math
element.
Processing expectations
Formatted as a displayed block. For an inline equation, use
inlineequation.
Processing systems that number equations or build a table of
equations at the beginning of a document may have difficulty correctly
formatting documents that contain both equations
with titles and equations
without titles. You are advised to use informalequation for equations without
titles.
Attributes
- floatstyle
Specifies style information to be used when rendering the float
- label
Specifies an identifying string for presentation purposes
- pgwide
Indicates if the element is rendered across the column or the page
Enumerated values: “0” The element should be rendered in the current text flow (with the flow column width).
“1” The element should be rendered across the full text page.
Parents ![[+]](figs/web/nav/right.gif)
![[+]](figs/web/nav/down.gif)
Children
The following elements occur in equation: alt, caption (db.caption), info (db.titleforbidden.info), info (db.titleonly.info), mathphrase, mediaobject, mml:*, title, titleabbrev.
See Also
example, figure, informalequation, informalexample, informalfigure, informaltable, inlineequation, subscript, superscript, table
Examples
<article xmlns='http://docbook.org/ns/docbook'>
<title>Example equation</title>
<equation xml:id="eq.fermat">
<title>Fermat's Last Theorem</title>
<alt>x^n + y^n ≠ z^n ∀ n ≠ 2</alt>
<mediaobject>
<imageobject condition="print">
<imagedata fileref="figs/print/db5d_refeqn01.pdf"/>
</imageobject>
<imageobject condition="web">
<imagedata fileref="figs/web/db5d_refeqn01.png"/>
</imageobject>
</mediaobject>
</equation>
</article>
Alternatively, for relatively simple equations such as Fermat's Last
Theorem, mathphrase is often sufficient:
<article xmlns='http://docbook.org/ns/docbook'> <title>Example equation</title> <equation xml:id="eq.fermat.mathphrase"> <title>Fermat's Last Theorem</title> <alt>x^n + y^n ≠ z^n ∀ n ≠ 2</alt> <mathphrase>x<superscript>n</superscript> + y<superscript>n</superscript> ≠ z<superscript>n</superscript> ∀ n ≠ 2</mathphrase> </equation> </article>