<s>
Magnus	B-General_Concept
was	O
a	O
computer	B-General_Concept
algebra	I-General_Concept
system	I-General_Concept
designed	O
to	O
solve	O
problems	O
in	O
group	O
theory	O
.	O
</s>
<s>
It	O
was	O
designed	O
to	O
run	O
on	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
,	O
as	O
well	O
as	O
Windows	B-Application
.	O
</s>
<s>
The	O
unique	O
feature	O
of	O
Magnus	B-General_Concept
was	O
that	O
it	O
provided	O
facilities	O
for	O
doing	O
calculations	O
in	O
and	O
about	O
infinite	O
groups	O
.	O
</s>
<s>
Almost	O
all	O
symbolic	B-General_Concept
algebra	I-General_Concept
systems	I-General_Concept
are	O
oriented	O
toward	O
finite	O
computations	O
that	O
are	O
guaranteed	O
to	O
produce	O
answers	O
,	O
given	O
enough	O
time	O
and	O
resources	O
.	O
</s>
<s>
By	O
contrast	O
,	O
Magnus	B-General_Concept
was	O
concerned	O
with	O
experiments	O
and	O
computations	O
on	O
infinite	O
groups	O
which	O
in	O
some	O
cases	O
are	O
known	O
to	O
terminate	O
,	O
while	O
in	O
others	O
are	O
known	O
to	O
be	O
generally	O
recursively	O
unsolvable	O
.	O
</s>
