public boolean equals(Object other) {
        if (other == Polynom.NaP || this == Polynom.NaP ){
            return false;
        }

        boolean eq = false;
        if (other instanceof Polynom){ // hier könnte man auch this.getClass() == other.getClass()
            if ((other) != null && this != null){
                if (((MapPolynom)other).degree() == this.degree()){
                    int i = (int)this.degree();
                    while (i>=0){
                        if ( this.coeff(i) == ((MapPolynom)other).coeff(i)){
                            eq = true;
                            i--;
                        }else{
                            eq = false;
                            break;
                        }
                    }
                }
            }
        }
        return eq;
    }