On the real line, , , ,
each have an infinite number of zeros, all of which are negative.
They are denoted by , , , ,
respectively, arranged in
ascending order of absolute value for
and have no other zeros. However,
and each have an infinite number of complex zeros. They lie in
the sectors and
, and are denoted by , , respectively, in the former sector, and by
, , in the
conjugate sector, again arranged in ascending order of absolute value (modulus)
for See §9.3(ii) for visualizations.