<s>
In	O
many-body	B-Algorithm
physics	I-Algorithm
,	O
the	O
problem	O
of	O
analytic	B-Algorithm
continuation	I-Algorithm
is	O
that	O
of	O
numerically	O
extracting	O
the	O
spectral	O
density	O
of	O
a	O
Green	O
function	O
given	O
its	O
values	O
on	O
the	O
imaginary	O
axis	O
.	O
</s>
<s>
Mathematically	O
,	O
the	O
problem	O
reduces	O
to	O
solving	O
a	O
Fredholm	B-Algorithm
integral	I-Algorithm
equation	I-Algorithm
of	I-Algorithm
the	I-Algorithm
first	I-Algorithm
kind	I-Algorithm
with	O
an	O
ill-conditioned	O
kernel	O
.	O
</s>
<s>
Another	O
example	O
of	O
the	O
analytic	B-Algorithm
continuation	I-Algorithm
is	O
calculating	O
the	O
optical	O
conductivity	O
from	O
the	O
current-current	O
correlation	O
function	O
values	O
at	O
Matsubara	O
frequencies	O
.	O
</s>
<s>
:	O
Open	O
source	O
utility	O
for	O
performing	O
analytic	B-Algorithm
continuation	I-Algorithm
using	O
the	O
maximum	O
entropy	O
method	O
.	O
</s>
<s>
:	O
Free	O
online	O
tool	O
for	O
performing	O
analytic	B-Algorithm
continuation	I-Algorithm
using	O
the	O
average	O
spectrum	O
Method	O
.	O
</s>
<s>
:	O
Sparse	O
modeling	O
tool	O
for	O
analytic	B-Algorithm
continuation	I-Algorithm
of	O
imaginary-time	O
Green	O
’s	O
function	O
.	O
</s>
