 The Table {\it Constraints} consists of three fields:
\begin{enumerate}
\item {\it Name} for the constrained parameter. The requirements 
for this field are the same as for the name of independent parameres 
(see above);

\item {\it Expression} which  must be an algebraic formula
composed of: 
\begin{itemize}
\item integer numbers, 
\item identifiers enumerated in the {\it Parameters} Table, 
\item identifiers defined above in this Table, 
\item parentheses (), arithmetic operators  +, -, /, *, **, 
  and the $sqrt()$ function.
\end{itemize}
For raising to a power the second operand must be
an integer;

\item {\it Comment} for brief  description of parameters.
\end{enumerate}
