<?xml version="1.0" encoding="utf-8" ?> <!-- for emacs: -*- coding: utf-8 -*- -->
<!-- Apache may like this line in the file .htaccess: AddCharset utf-8 .html -->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0 plus SVG 1.1//EN" "http://www.w3.org/2002/04/xhtml-math-svg/xhtml-math-svg-flat.dtd" >
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head><title>Holder -- the class of all holder expressions</title>
<link rel="stylesheet" type="text/css" href="../../../../Macaulay2/Style/doc.css"/>
</head>
<body>
<table class="buttons">
<tr>
<td><div><a href="___Hom.html">next</a> | <a href="_hold.html">previous</a> | <a href="___Hom.html">forward</a> | <a href="_hold.html">backward</a> | up | <a href="index.html">top</a> | <a href="master.html">index</a> | <a href="toc.html">toc</a> | <a href="http://www.math.uiuc.edu/Macaulay2/">Macaulay2 web site</a></div>
</td>
</tr>
</table>
<hr/>
<div><h1>Holder -- the class of all holder expressions</h1>
<div class="single"><h2>Description</h2>
<div><p/>
This type of expresssion is a container for a single, arbitrary, thing that is basic enough that the correct method for printing does not depend on its neighbors in the containing expression. A negative number would not be basic enough for this purpose, since as a member of a sum, it would require special treatment.</div>
</div>
<div class="waystouse"><h2>Types of holder :</h2>
<ul><li><span><a href="___One__Expression.html" title="the class all one expressions">OneExpression</a> -- the class all one expressions</span></li>
<li><span><a href="___Zero__Expression.html" title="the class of all zero expressions">ZeroExpression</a> -- the class of all zero expressions</span></li>
</ul>
<h2>Methods that use a holder :</h2>
<ul><li><span>- Holder, see <span><a href="_-.html" title="a unary or binary operator, usually used for negation or subtraction">-</a> -- a unary or binary operator, usually used for negation or subtraction</span></span></li>
<li><span>Equation == Holder, see <span><a href="__eq_eq.html" title="equality">==</a> -- equality</span></span></li>
<li><span>Holder == Equation, see <span><a href="__eq_eq.html" title="equality">==</a> -- equality</span></span></li>
<li><span>Holder == Holder, see <span><a href="__eq_eq.html" title="equality">==</a> -- equality</span></span></li>
<li><span>baseName(Holder), see <span><a href="_base__Name.html" title="the base name of a generator">baseName</a> -- the base name of a generator</span></span></li>
<li><span>Holder / OneExpression, see <span><a href="___Constant.html" title="">Constant</a></span></span></li>
<li><span><tt>Expression ..< Holder</tt> (missing documentation<!-- tag: (..<,Expression,Holder) -->)</span></li>
<li><span><tt>Holder ..< Expression</tt> (missing documentation<!-- tag: (..<,Holder,Expression) -->)</span></li>
<li><span><tt>Holder ..< Holder</tt> (missing documentation<!-- tag: (..<,Holder,Holder) -->)</span></li>
</ul>
</div>
<div class="waystouse"><h2>For the programmer</h2>
<p>The object <a href="___Holder.html" title="the class of all holder expressions">Holder</a> is <span>a <a href="___Wrapper__Type.html">wrapper type</a></span>, with ancestor classes <a href="___Expression.html" title="the class of all expressions">Expression</a> < <a href="___Basic__List.html" title="the class of all basic lists">BasicList</a> < <a href="___Thing.html" title="the class of all things">Thing</a>.</p>
</div>
</div>
</body>
</html>
