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.

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 Macaulay2Doc/doc12.m2:57:0.

Holder -- the class of all holder expressions

Description

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Types of holder:

For the programmer