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# Holder -- the class of all holder expressions

## Description

This type of expression 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.

### Menu

- Describe -- the class of the output of describe
- OneExpression -- the class all one expressions
- Parenthesize
- ZeroExpression -- the class of all zero expressions

## Types of holder:

- Describe -- the class of the output of describe
- OneExpression -- the class all one expressions
- Parenthesize
- ZeroExpression -- the class of all zero expressions

## For the programmer

The object Holder is a wrapper type, with ancestor classes Expression < BasicList < Thing.

The source of this document is in /build/macaulay2-88fgJW/macaulay2-1.25.11+ds/M2/Macaulay2/packages/Macaulay2Doc/doc12.m2:57:0.