/** Basic CAS symbol. It has a name because it must know how to output itself.
* It may be assigned an expression, but this feature is only intended for
* programs like 'ginsh' that want to associate symbols with expressions.
/** Basic CAS symbol. It has a name because it must know how to output itself.
* It may be assigned an expression, but this feature is only intended for
* programs like 'ginsh' that want to associate symbols with expressions.