Free expression
An expression in which every variable is a Free variable.
If a free expresion is as large as it can be, in the sense that it is not a proper subexpression of another free expression, it is called a Maximal free expression.
An expression in which every variable is a Free variable.
If a free expresion is as large as it can be, in the sense that it is not a proper subexpression of another free expression, it is called a Maximal free expression.