cout << "\t x = "; x.print_v();
			cout << "\t lambda = " << lambda << endl;
			cout << "\t f(x) = " << funktion(x) << endl;
			cout << "\t grad f(x) = "; x.gradient(x, funktion).print_v();
			cout << "\t ||grad f(x)|| = " << x.gradient(x, funktion).length() << endl << endl;
			break;