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Linear approximation
Function
| postulate | $x$ |
todo
Discussion
${\bf x}(t)=\sum_{i=1}^nx^i(t){\bf e}_i(t)$
$\dfrac{\partial }{\partial t}{\bf x}(t)=\sum_{i=1}^n\left(\left(\dfrac{\partial }{\partial t}x^i(t)\right){\bf e}_i(t)+x^i(t)\dfrac{\partial }{\partial t}{\bf e}_i(t)\right)$
Reference
Context
