%$ \[ \left| \begin{array}{ccc} \vec{u_0} & \vec{b_0} & \vec{p} - \vec{b} \end{array} \right| = \left\{ \begin{array}{cl} = 0 & \mbox{\rm linear dependent} \\ & \mbox{\rm g and h are intersecting}\\ \neq 0 & \mbox{\rm linear independent} \\ & \mbox{\rm g and h are skew} \end{array} \right. \] $%

%$ \mbox{\rm where } g: \vec{x} = \vec{p} + \mu \vec{u_0} $% %$\mbox{\rm and } g: \vec{r} = \vec{a} + \lambda \vec{b_0}$%

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-- PeterZumbruch - 24 Feb 2004