
## Invertibility Assumption .

..

i

$$\overline{{{-i}}}\quad\quad j\quad\overline{{{-j}}}\quad\overline{{{i}}}$$

![0_image_2.png](0_image_2.png)

$$\begin{array}{ccc}i&j\\ &i\\ &\mathbf{N}\end{array}$$  $$\begin{array}{ccc}i&j\\ &j&k\end{array}$$

![0_image_1.png](0_image_1.png)

![0_image_0.png](0_image_0.png)

$$\frac{\partial\vec{u}}{\partial\vec{v}}$$ ... 
i

$$\overline{{\begin{array}{c}{{\overline{{i}}}}\end{array}}}$$
$$\dot{i}$$

![0_image_3.png](0_image_3.png)

"" ... ---
$$\dot{i}$$ = $$\dot{j}$$. 
si l-si . 0 i 95