Originally Posted by

**dhiab** Find all vector

$\displaystyle {\mathord{\buildrel{\lower3pt\hbox{$\scriptscripts tyle\rightharpoonup$}}

\over v} }

$

such that :

$\displaystyle \mathord{\buildrel{\lower3pt\hbox{$\scriptscriptst yle\rightharpoonup$}}

\over v} .\mathord{\buildrel{\lower3pt\hbox{$\scriptscripts tyle\rightharpoonup$}}

\over v} + 2\mathord{\buildrel{\lower3pt\hbox{$\scriptscripts tyle\rightharpoonup$}}

\over u} .\mathord{\buildrel{\lower3pt\hbox{$\scriptscripts tyle\rightharpoonup$}}

\over v} = \alpha $

and :

$\displaystyle

\begin{array}{l}

\alpha :const - value \\

\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptst yle\rightharpoonup$}}

\over u} :const - vector \\

\end{array}$