Let *N**0**(s)* and *M**0**(s)* be stable and minimum phase spectral
factors:

Then *P**0**= N**0** /* *M**0* is a normalized coprime factorization and (*N**0* *N**z*) and (*M**0* *N**p*) form a pair of
normalized coprime factorizations of *P*.

Thus

where *r*>0, -p/2<q< p/2, and