3 15 75  Constraints                 
1. "Name" is  an identifier of the variable. See the Help for the
"Parameter" table for more detailed information.
2. Expression -  must be an algebraic formula, which composed of integer
numbers, identifiers defined above in this table, identifiers enumerated
in the "Parameters" table, parentheses '(',')', arithmetic operators
'+'.'-','/','*','**' and the sqrt( ) function. For raising to a power the
second operand must be an integer.
3. 'Comment' is a brief parameter description.
