<s>
In	O
linear	B-Language
algebra	I-Language
,	O
the	O
main	B-Algorithm
diagonal	I-Algorithm
(	O
sometimes	O
principal	B-Algorithm
diagonal	I-Algorithm
,	O
primary	B-Algorithm
diagonal	I-Algorithm
,	O
leading	B-Algorithm
diagonal	I-Algorithm
,	O
major	O
diagonal	O
,	O
or	O
good	O
diagonal	O
)	O
of	O
a	O
matrix	B-Architecture
is	O
the	O
list	O
of	O
entries	O
where	O
.	O
</s>
<s>
All	O
off-diagonal	O
elements	O
are	O
zero	O
in	O
a	O
diagonal	B-Algorithm
matrix	I-Algorithm
.	O
</s>
<s>
The	O
following	O
four	O
matrices	O
have	O
their	O
main	B-Algorithm
diagonals	I-Algorithm
indicated	O
by	O
red	O
ones	O
:	O
</s>
<s>
The	O
antidiagonal	B-Algorithm
(	O
sometimes	O
counter	B-Algorithm
diagonal	I-Algorithm
,	O
secondary	O
diagonal	O
,	O
trailing	O
diagonal	O
,	O
minor	B-Algorithm
diagonal	I-Algorithm
,	O
off	O
diagonal	O
,	O
or	O
bad	O
diagonal	O
)	O
of	O
an	O
order	O
square	B-Algorithm
matrix	I-Algorithm
is	O
the	O
collection	O
of	O
entries	O
such	O
that	O
for	O
all	O
.	O
</s>
