<s>
In	O
mathematics	O
,	O
the	O
Gilbert	B-Algorithm
–	I-Algorithm
Pollack	I-Algorithm
conjecture	I-Algorithm
is	O
an	O
unproven	O
conjecture	O
on	O
the	O
ratio	O
of	O
lengths	O
of	O
Steiner	O
trees	O
and	O
Euclidean	O
minimum	O
spanning	O
trees	O
for	O
the	O
same	O
point	O
sets	O
in	O
the	O
Euclidean	O
plane	O
.	O
</s>
<s>
The	O
Gilbert	B-Algorithm
–	I-Algorithm
Pollack	I-Algorithm
conjecture	I-Algorithm
states	O
that	O
this	O
example	O
is	O
the	O
worst	O
case	O
for	O
the	O
Steiner	O
ratio	O
,	O
and	O
that	O
this	O
ratio	O
equals	O
.	O
</s>
