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Defined
Syntax
Defined(E)

where E is a CoCoA expression.
Summary
check if an expression has been defined
Description
This function returns TRUE if E is defined, otherwise it returns
false.  Typically, it is used to check if a name has already been
assigned.

Example

Defined(MyVariable);
FALSE
-------------------------------
MyVariable := 3;
Defined(MyVariable);
TRUE
-------------------------------