NAME

  Math::Expr::Var - Represents a agebraic rule

SYNOPSIS

  reuire Math::Expr::Var;
  reuire Math::Expr;
        
        $r=new Math::Expr::Var($from, $to);
  @res=$r->Apply($expr)

DESCRIPTION

  This will create a rule that converts the expression $from to $to,
  and then apply that rule to $expr. $from, $to, $expr are all
  Math::Expr::Opp structures that should be Simplified to work ok.

  The result is a array @res of Math::Expr::Opp objects which should 
  contain the results of applying the rule once on $expr in all 
  possible ways. They are all simplified, and duplicaions are removed.

METHODS

$r=new Math::Expr::Var($from, $to);

  Makes a rule converting the Math::Expr::Opp structur $from into $to.