This is a general question about root locus plots. I notice that there is a source that says:
"The root locus begins at the finite and infinite poles of G(s)H(s)".
Note the part that says 'finite and INFINITE poles'.
Should the part that says 'infinite' be omitted? The root locus only begins at the FINITE open loop pole locations, right?
If the statement is indeed correct - about cases where a root locus may start at 'infinite' pole locations, then are there any examples of such cases?