<s>
In	O
mathematics	O
,	O
the	O
Neumann	B-Algorithm
–	I-Algorithm
Dirichlet	I-Algorithm
method	I-Algorithm
is	O
a	O
domain	B-Algorithm
decomposition	I-Algorithm
preconditioner	O
which	O
involves	O
solving	O
Neumann	O
boundary	O
value	O
problem	O
on	O
one	O
subdomain	O
and	O
Dirichlet	O
boundary	O
value	O
problem	O
on	O
another	O
,	O
adjacent	O
across	O
the	O
interface	O
between	O
the	O
subdomains	O
.	O
</s>
