<s>
Regina	B-Application
is	O
a	O
suite	O
of	O
mathematical	O
software	O
for	O
3-manifold	O
topologists	B-Architecture
.	O
</s>
<s>
Regina	B-Application
implements	O
a	O
variant	O
of	O
Rubinstein	O
's	O
3-sphere	O
recognition	O
algorithm	O
.	O
</s>
<s>
Regina	B-Application
further	O
implements	O
the	O
connect-sum	O
decomposition	O
.	O
</s>
<s>
Homology	B-Algorithm
and	O
Poincare	O
duality	O
for	O
3-manifolds	O
,	O
including	O
the	O
torsion	O
linking	O
form	O
.	O
</s>
<s>
Includes	O
portions	O
of	O
the	O
SnapPea	B-Language
kernel	I-Language
for	O
some	O
geometric	O
calculations	O
.	O
</s>
<s>
Has	O
both	O
a	O
GUI	B-Application
and	O
Python	B-Language
interface	O
.	O
</s>
