<s>
Yacas	B-Language
is	O
a	O
general-purpose	O
computer	B-General_Concept
algebra	I-General_Concept
system	I-General_Concept
.	O
</s>
<s>
The	O
name	O
is	O
an	O
acronym	O
for	O
Yet	O
Another	O
Computer	B-General_Concept
Algebra	I-General_Concept
System	I-General_Concept
.	O
</s>
<s>
Released	O
under	O
the	O
GNU	B-Application
Lesser	I-Application
General	I-Application
Public	I-Application
License	I-Application
,	O
Yacas	B-Language
is	O
free	B-Application
software	I-Application
.	O
</s>
<s>
YACAS	B-Language
is	O
a	O
program	O
for	O
symbolic	O
manipulation	O
of	O
mathematical	O
expressions	O
.	O
</s>
<s>
It	O
uses	O
its	O
own	O
programming	O
language	O
designed	O
for	O
symbolic	O
as	O
well	O
as	O
arbitrary-precision	B-Algorithm
numerical	O
computations	O
.	O
</s>
<s>
The	O
system	O
has	O
a	O
library	O
of	O
scripts	O
that	O
implement	O
many	O
of	O
the	O
symbolic	B-General_Concept
algebra	I-General_Concept
operations	O
;	O
new	O
algorithms	O
can	O
be	O
easily	O
added	O
to	O
the	O
library	O
.	O
</s>
<s>
YACAS	B-Language
comes	O
with	O
extensive	O
documentation	O
covering	O
the	O
scripting	O
language	O
,	O
the	O
functionality	O
that	O
is	O
already	O
implemented	O
in	O
the	O
system	O
,	O
and	O
the	O
algorithms	O
used	O
.	O
</s>
<s>
Yacas	B-Language
handles	O
input	O
and	O
output	O
in	O
plain	O
ASCII	B-Protocol
or	O
in	O
OpenMath	B-Language
,	O
either	O
interactively	O
or	O
in	O
batch	O
mode	O
.	O
</s>
