--- trunk/src/math/Polynomial.hpp	2006/01/30 22:25:27	876
+++ trunk/src/math/Polynomial.hpp	2006/02/02 17:14:15	883
@@ -204,6 +204,7 @@ namespace oopse {
         for (i =  p.begin(); i  != p.end(); ++i) {
           this->addCoefficient(i->first, -i->second);
         }        
+        return *this;
     }
 
     PolynomialType& operator *= (const PolynomialType& p) {
@@ -310,7 +311,7 @@ namespace oopse {
 
   /**
    * Tests if two polynomial have the same exponents
-   * @return true if these all of the exponents in these Polynomial are identical
+   * @return true if all of the exponents in these Polynomial are identical
    * @param p1 the first polynomial
    * @param p2 the second polynomial
    * @note this function does not compare the coefficient