21  t1_1(
j) = t2s_2(
i, 
j) * t1_2(
i);
 
   23                  - (t2s_2(0, 0) * t1_2(0) + t2s_2(1, 0) * t1_2(1)
 
   24                     + t2s_2(2, 0) * t1_2(2)),
 
   27                  - (t2s_2(0, 1) * t1_2(0) + t2s_2(1, 1) * t1_2(1)
 
   28                     + t2s_2(2, 1) * t1_2(2)),
 
   31                  - (t2s_2(0, 2) * t1_2(0) + t2s_2(1, 2) * t1_2(1)
 
   32                     + t2s_2(2, 2) * t1_2(2)),
 
   35  t1_1(
j) = t1_2(
i) * t2s_2(
i, 
j);
 
   37                  - (t2s_2(0, 0) * t1_2(0) + t2s_2(1, 0) * t1_2(1)
 
   38                     + t2s_2(2, 0) * t1_2(2)),
 
   41                  - (t2s_2(0, 1) * t1_2(0) + t2s_2(1, 1) * t1_2(1)
 
   42                     + t2s_2(2, 1) * t1_2(2)),
 
   45                  - (t2s_2(0, 2) * t1_2(0) + t2s_2(1, 2) * t1_2(1)
 
   46                     + t2s_2(2, 2) * t1_2(2)),
 
 
void test_T2s_21(Tensor1< double, 3 > &t1_1, const Tensor1< double, 3 > &t1_2, const Tensor2_symmetric< double, 3 > &t2s_2)