# 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.

## Methods that use a holder :

• "- Holder" -- see - -- a unary or binary operator, usually used for negation or subtraction
• "Equation == Holder" -- see == -- equality
• "Holder == Equation" -- see == -- equality
• "baseName(Holder)" -- see baseName -- the base name of a generator
• "Holder / OneExpression" -- see Constant
• "Expression != Holder" -- see Expression -- the class of all expressions
• "Expression % Holder" -- see Expression -- the class of all expressions
• "Expression & Holder" -- see Expression -- the class of all expressions
• "Expression * Holder" -- see Expression -- the class of all expressions
• "Expression ** Holder" -- see Expression -- the class of all expressions
• "Expression + Holder" -- see Expression -- the class of all expressions
• "Expression ++ Holder" -- see Expression -- the class of all expressions
• "Expression - Holder" -- see Expression -- the class of all expressions
• "Expression .. Holder" -- see Expression -- the class of all expressions
• "Expression ..< Holder" -- see Expression -- the class of all expressions
• "Expression / Holder" -- see Expression -- the class of all expressions
• "Expression : Holder" -- see Expression -- the class of all expressions
• "Expression <== Holder" -- see Expression -- the class of all expressions
• "Expression <=== Holder" -- see Expression -- the class of all expressions
• "Expression <==> Holder" -- see Expression -- the class of all expressions
• "Expression == Holder" -- see Expression -- the class of all expressions
• "Expression ===> Holder" -- see Expression -- the class of all expressions
• "Expression ==> Holder" -- see Expression -- the class of all expressions
• "Expression @ Holder" -- see Expression -- the class of all expressions
• "Expression @@ Holder" -- see Expression -- the class of all expressions
• "Expression ^ Holder" -- see Expression -- the class of all expressions
• "Expression ^** Holder" -- see Expression -- the class of all expressions
• "Expression ^^ Holder" -- see Expression -- the class of all expressions
• "Expression _ Holder" -- see Expression -- the class of all expressions
• "Expression | Holder" -- see Expression -- the class of all expressions
• "Expression |- Holder" -- see Expression -- the class of all expressions
• "Expression || Holder" -- see Expression -- the class of all expressions
• "Expression and Holder" -- see Expression -- the class of all expressions
• "Expression Holder" -- see Expression -- the class of all expressions
• "Expression or Holder" -- see Expression -- the class of all expressions
• "Expression xor Holder" -- see Expression -- the class of all expressions
• "Holder != Expression" -- see Expression -- the class of all expressions
• "Holder != Holder" -- see Expression -- the class of all expressions
• "Holder % Expression" -- see Expression -- the class of all expressions
• "Holder % Holder" -- see Expression -- the class of all expressions
• "Holder & Expression" -- see Expression -- the class of all expressions
• "Holder & Holder" -- see Expression -- the class of all expressions
• "Holder * Expression" -- see Expression -- the class of all expressions
• "Holder * Holder" -- see Expression -- the class of all expressions
• "Holder ** Expression" -- see Expression -- the class of all expressions
• "Holder ** Holder" -- see Expression -- the class of all expressions
• "Holder + Expression" -- see Expression -- the class of all expressions
• "Holder + Holder" -- see Expression -- the class of all expressions
• "Holder ++ Expression" -- see Expression -- the class of all expressions
• "Holder ++ Holder" -- see Expression -- the class of all expressions
• "Holder - Expression" -- see Expression -- the class of all expressions
• "Holder - Holder" -- see Expression -- the class of all expressions
• "Holder .. Expression" -- see Expression -- the class of all expressions
• "Holder .. Holder" -- see Expression -- the class of all expressions
• "Holder ..< Expression" -- see Expression -- the class of all expressions
• "Holder ..< Holder" -- see Expression -- the class of all expressions
• "Holder / Expression" -- see Expression -- the class of all expressions
• "Holder / Holder" -- see Expression -- the class of all expressions
• "Holder : Expression" -- see Expression -- the class of all expressions
• "Holder : Holder" -- see Expression -- the class of all expressions
• "Holder <== Expression" -- see Expression -- the class of all expressions
• "Holder <== Holder" -- see Expression -- the class of all expressions
• "Holder <=== Expression" -- see Expression -- the class of all expressions
• "Holder <=== Holder" -- see Expression -- the class of all expressions
• "Holder <==> Expression" -- see Expression -- the class of all expressions
• "Holder <==> Holder" -- see Expression -- the class of all expressions
• "Holder == Expression" -- see Expression -- the class of all expressions
• "Holder == Holder" -- see Expression -- the class of all expressions
• "Holder ===> Expression" -- see Expression -- the class of all expressions
• "Holder ===> Holder" -- see Expression -- the class of all expressions
• "Holder ==> Expression" -- see Expression -- the class of all expressions
• "Holder ==> Holder" -- see Expression -- the class of all expressions
• "Holder @ Expression" -- see Expression -- the class of all expressions
• "Holder @ Holder" -- see Expression -- the class of all expressions
• "Holder @@ Expression" -- see Expression -- the class of all expressions
• "Holder @@ Holder" -- see Expression -- the class of all expressions
• "Holder ^ Expression" -- see Expression -- the class of all expressions
• "Holder ^ Holder" -- see Expression -- the class of all expressions
• "Holder ^** Expression" -- see Expression -- the class of all expressions
• "Holder ^** Holder" -- see Expression -- the class of all expressions
• "Holder ^^ Expression" -- see Expression -- the class of all expressions
• "Holder ^^ Holder" -- see Expression -- the class of all expressions
• "Holder _ Expression" -- see Expression -- the class of all expressions
• "Holder _ Holder" -- see Expression -- the class of all expressions
• "Holder | Expression" -- see Expression -- the class of all expressions
• "Holder | Holder" -- see Expression -- the class of all expressions
• "Holder |- Expression" -- see Expression -- the class of all expressions
• "Holder |- Holder" -- see Expression -- the class of all expressions
• "Holder || Expression" -- see Expression -- the class of all expressions
• "Holder || Holder" -- see Expression -- the class of all expressions
• "Holder and Expression" -- see Expression -- the class of all expressions
• "Holder and Holder" -- see Expression -- the class of all expressions
• "Holder Expression" -- see Expression -- the class of all expressions
• "Holder Holder" -- see Expression -- the class of all expressions
• "Holder or Expression" -- see Expression -- the class of all expressions
• "Holder or Holder" -- see Expression -- the class of all expressions
• "Holder xor Expression" -- see Expression -- the class of all expressions
• "Holder xor Holder" -- see Expression -- the class of all expressions
• Sum + Holder (missing documentation)

## For the programmer

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