Figure 19.3.3:
as a function of and
for , .
If (), then
the function reduces to ,
becoming infinite when .
If (), then it has the value
: put in (19.25.5) and
use (19.25.1).
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Figure 19.3.4:
as a function of and
for , .
If (), then the function reduces to
, with value 1 at .
If (), then it has the value
,
with limit 1 as :
put in (19.25.7) and use (19.25.1).
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Figure 19.3.5:
as a function of and
for , .
Cauchy principal values are shown when .
The function is unbounded as , and
also (with the same sign as ) as .
As it has the limit
.
If , then it reduces to .
If , then it has the value
when , and
0 when .
See §19.6(i).
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Figure 19.3.6:
as a function of and
for , .
Cauchy principal values are shown when
.
The function tends to as ,
except in the last case below.
If (), then the function reduces to
with Cauchy principal value
,
which tends to as .
See (19.6.5) and (19.6.6).
If (), then by (19.7.4)
it reduces to , ,
with Cauchy principal value
,
, by (19.6.5).
Its value tends to as by
(19.6.6), and to the negative of the second lemniscate
constant (see (19.20.22)) as
.
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In Figures 19.3.7 and 19.3.8 for complete
Legendre’s elliptic integrals with complex arguments, height corresponds to the
absolute value of the function and color to the phase. See also About Color Map.
Figure 19.3.7: as a function of complex
for ,
.
There is a branch cut where .
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Figure 19.3.9:
as a function of complex
for ,
.
The real part is symmetric under reflection in the real axis.
On the branch cut () it is infinite at , and
has the value when .
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Figure 19.3.10:
as a function of complex
for ,
.
The imaginary part is 0 for , and
is antisymmetric under reflection in the real axis.
On the upper edge of the branch cut ()
it has the value if , and
if .
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Figure 19.3.11:
as a function of complex
for ,
.
The real part is symmetric under reflection in the real axis.
On the branch cut () it has the value
,
with limit 1 as .
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Figure 19.3.12:
as a function of complex
for ,
.
The imaginary part is 0 for and
is antisymmetric under reflection in the real axis.
On the upper edge of the branch cut () it has the
(negative) value ,
with limit 0 as .
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