* multiplication operator for SymmetricTensor, which does the double
* contraction.
*
- * @note In case the contraction yields tensor of rank 0 the scalar
+ * @note In case the contraction yields a tensor of rank 0 the scalar
* number is returned as an unwrapped number type.
*
* @relates Tensor
* @note The position of the index is counted from 0, i.e.,
* $0\le\text{index_i}<\text{range_i}$.
*
- * @note In case the contraction yields tensor of rank 0 the scalar
+ * @note In case the contraction yields a tensor of rank 0 the scalar
* number is returned as an unwrapped number type.
*
* @relates Tensor
* @note The position of the index is counted from 0, i.e.,
* $0\le\text{index_i}<\text{range_i}$.
*
- * @note In case the contraction yields tensor of rank 0 the scalar
+ * @note In case the contraction yields a tensor of rank 0 the scalar
* number is returned as an unwrapped number type.
*
* @relates Tensor