q|*N**p*(*s*)| and *|N**0*(*s*)| are both small for some
s. That is, |*N**p*(*s*)|»0 (i.e.,*
s* is close to a right-half
plane pole of *P*)
and *|N**0*(*s*)|»0 (i.e., |*P*(*j**w*)| is small around w*=|s|=r*).

This is possible if |*P*(*j**w*)| is small around w*=r* where *r* is the modulus of a right-half plane pole of *P *(See Example 16.3)

q*|N**0*(*s*)| and *|M**0*(*s*)| are both small for some* s*. That is, *|N**0*(*s*)|»0 (i.e., |*P*(*j**w*)| is small around w*=|s|=r*) and *|M**0*(*s*)|»0 (i.e., |*P*(*j**w*)| is large around w*=|s|=r*).

The only way in which |*P*(*j**w*)| can be both small and
large at frequencies near w*=r* is that |*P*(*j**w*)| is approximately equal to 1 and the absolute value of the
slope of |*P*(*j**w*)| is large. (See Example 16.4)