We define state space and map input in state space and output as a combination of the state variable. If we define a transfer function with two variables s1 and s2, then how can we define the minimal state space form for this transfer function?
For example, if T(s1,s2)=(s1+s2)/s1s2-1, and the minimal state space has an imaginary value in minimal state space, what is the meaning of imaginary in this realization? And how can we migrate from complex variables to real, and import a real state space from this realization?