<s>
In	O
mathematics	O
,	O
an	O
H-matrix	B-Algorithm
is	O
a	O
matrix	B-Architecture
whose	O
comparison	B-Algorithm
matrix	I-Algorithm
is	O
an	O
M-matrix	B-Algorithm
.	O
</s>
<s>
It	O
is	O
useful	O
in	O
iterative	B-Algorithm
methods	I-Algorithm
.	O
</s>
<s>
Definition	O
:	O
Let	O
be	O
a	O
complex	O
matrix	B-Architecture
.	O
</s>
<s>
Then	O
comparison	B-Algorithm
matrix	I-Algorithm
M(A )	O
of	O
complex	O
matrix	B-Architecture
A	O
is	O
defined	O
as	O
where	O
for	O
all	O
and	O
for	O
all	O
.	O
</s>
<s>
If	O
M(A )	O
is	O
a	O
M-matrix	B-Algorithm
,	O
A	O
is	O
a	O
H-matrix	B-Algorithm
.	O
</s>
<s>
Invertible	O
H-matrix	B-Algorithm
guarantees	O
convergence	O
of	O
Gauss	B-Algorithm
–	I-Algorithm
Seidel	I-Algorithm
iterative	I-Algorithm
methods	I-Algorithm
.	O
</s>
