24  t2s_1(
j, 
i) += t2s_2(
i, 
j);
 
   25  test_for_zero(t2s_1(0, 0) - (2 * t2s_2(0, 0) + t1_2(0) * t1_2(0)),
 
   26                "T2s(j,i)+=T2s(i,j)(0,0)");
 
   27  test_for_zero(t2s_1(1, 0) - (2 * t2s_2(0, 1) + t1_2(0) * t1_2(1)),
 
   28                "T2s(j,i)+=T2s(i,j)(0,1)");
 
   29  test_for_zero(t2s_1(2, 0) - (2 * t2s_2(0, 2) + t1_2(0) * t1_2(2)),
 
   30                "T2s(j,i)+=T2s(i,j)(0,2)");
 
   31  test_for_zero(t2s_1(0, 1) - (2 * t2s_2(1, 0) + t1_2(1) * t1_2(0)),
 
   32                "T2s(j,i)+=T2s(i,j)(1,0)");
 
   33  test_for_zero(t2s_1(1, 1) - (2 * t2s_2(1, 1) + t1_2(1) * t1_2(1)),
 
   34                "T2s(j,i)+=T2s(i,j)(1,1)");
 
   35  test_for_zero(t2s_1(2, 1) - (2 * t2s_2(1, 2) + t1_2(1) * t1_2(2)),
 
   36                "T2s(j,i)+=T2s(i,j)(1,2)");
 
   37  test_for_zero(t2s_1(0, 2) - (2 * t2s_2(2, 0) + t1_2(2) * t1_2(0)),
 
   38                "T2s(j,i)+=T2s(i,j)(2,0)");
 
   39  test_for_zero(t2s_1(1, 2) - (2 * t2s_2(2, 1) + t1_2(2) * t1_2(1)),
 
   40                "T2s(j,i)+=T2s(i,j)(2,1)");
 
   41  test_for_zero(t2s_1(2, 2) - (2 * t2s_2(2, 2) + t1_2(2) * t1_2(2)),
 
   42                "T2s(j,i)+=T2s(i,j)(2,2)");
 
 
void test_T2s_17(const Tensor1< double, 3 > &t1_2, Tensor2_symmetric< double, 3 > &t2s_1, const Tensor2_symmetric< double, 3 > &t2s_2)