<s>
GAP	O
(	O
Groups	O
,	O
Algorithms	O
and	O
Programming	B-General_Concept
)	O
is	O
a	O
computer	B-General_Concept
algebra	I-General_Concept
system	I-General_Concept
for	O
computational	O
discrete	O
algebra	O
with	O
particular	O
emphasis	O
on	O
computational	O
group	O
theory	O
.	O
</s>
<s>
GAP	O
and	O
its	O
sources	O
,	O
including	O
packages	O
(	O
sets	O
of	O
user	O
contributed	O
programs	O
)	O
,	O
data	O
library	O
(	O
including	O
a	O
list	O
of	O
small	O
groups	O
)	O
and	O
the	O
manual	O
,	O
are	O
distributed	O
freely	O
,	O
subject	O
to	O
"	O
copyleft	B-License
"	O
conditions	O
.	O
</s>
<s>
GAP	O
runs	O
on	O
any	O
Unix	B-Application
system	I-Application
,	O
under	O
Windows	B-Application
,	O
and	O
on	O
Macintosh	B-Device
systems	O
.	O
</s>
<s>
An	O
interface	O
is	O
available	O
for	O
using	O
the	O
SINGULAR	B-General_Concept
computer	I-General_Concept
algebra	I-General_Concept
system	I-General_Concept
from	O
within	O
GAP	O
.	O
</s>
<s>
GAP	O
is	O
also	O
included	O
in	O
the	O
mathematical	O
software	O
system	O
SageMath	B-Application
.	O
</s>
