In this note, we study the following problem, ''Under what condition(s
) is it possible to find a single controller which stabilizes k single
-input single-output linear time-invariant systems p(i)(s) (i = 1, ...
, k)?''. We introduce the concept of avoidance in the complex plane an
d use it to derive a sufficient condition for k systems to be simultan
eously stabilizable. A method for constructing a simultaneous stabiliz
ing controller is also provided and illustrated by an example.