TeX джерело:

\begin{aligned} & \overline a \cdot \overline b=(a_{ {x}}\overline \imath+a_{ {y}}\overline\jmath+a_{ {z}}\overline k)\cdot (b_{ {x}}\overline \imath+b_{ {y}}\overline\jmath+b_{ {z}}\overline k)= \\ & =a_{ {x}}b_{ {x}}{\overline \imath}^2+a_{{x}}b_{  {y}}{\overline \imath}\cdot {\overline \jmath}+a_{  {x}}b_{{z}}{\overline \imath}\cdot {\overline k}+a_{{y}}b_{{x}}{\overline \jmath}\cdot {\overline \imath}+a_{  {y}}b_{  {y}}{\overline \jmath}^2+a_{ {y}}b_{ {z}}{\overline \jmath}\cdot {\overline k}+a_{ {z}}b_{  {x}}{\overline k}\cdot {\overline \imath}+a_{  {z}}b_{  {y}}{\overline k}\cdot {\overline \jmath}+a_{  {z}}b_{  {z}}{\overline k}^2. \end{aligned}