\[
\boxed{
 \left\{ {\frac {\rm d}{{\rm d}t}}x \left( t \right) =cy \left( t \right) -bz \left( t \right) ,{\frac {\rm d}{{\rm d}t}}y \left( t \right) =az \left( t \right) -cx \left( t \right) ,{\frac {\rm d}{{\rm d}t}}z \left( t \right) =bx \left( t \right) -ay \left( t \right)  \right\} }
\]