<s>
In	O
linear	B-Language
algebra	I-Language
,	O
a	O
completely-S	B-Algorithm
matrix	I-Algorithm
is	O
a	O
square	B-Algorithm
matrix	I-Algorithm
such	O
that	O
for	O
every	O
principal	O
submatrix	O
R	O
there	O
exists	O
a	O
positive	O
vector	O
u	O
such	O
that	O
Ru	O
>	O
0	O
.	O
</s>
