Изменения

<tex> \forall \epsilon > 0 \exists \delta > 0 : \forall x : |x - \overline{x}| < \delta </tex>

<tex> ||F'(x) - F'(\overline{x})|| \le \sqrt{\sum(\frac{\partial f_i}{\partial x_j}(x) - \frac{\partial f_i}{\partial x_j}(\overline{x}))^2} </tex>