<s>
In	O
mathematics	O
,	O
Vinberg	B-Algorithm
's	I-Algorithm
algorithm	I-Algorithm
is	O
an	O
algorithm	O
,	O
introduced	O
by	O
Ernest	O
Borisovich	O
Vinberg	O
,	O
for	O
finding	O
a	O
fundamental	O
domain	O
of	O
a	O
hyperbolic	O
reflection	O
group	O
.	O
</s>
<s>
used	O
Vinberg	B-Algorithm
's	I-Algorithm
algorithm	I-Algorithm
to	O
describe	O
the	O
automorphism	O
group	O
of	O
the	O
26-dimensional	O
even	O
unimodular	O
Lorentzian	O
lattice	O
II25	O
,	O
1	O
in	O
terms	O
of	O
the	O
Leech	O
lattice	O
.	O
</s>
