<s>
Erable	B-Application
is	O
a	O
computer	B-General_Concept
algebra	I-General_Concept
system	I-General_Concept
(	O
CAS	O
)	O
for	O
a	O
family	O
of	O
Hewlett-Packard	O
graphing	O
scientific	O
calculators	O
of	O
the	O
HP	O
40	O
,	O
48	B-Device
and	O
HP	B-Device
49/50	I-Device
series	I-Device
.	O
</s>
<s>
Originally	O
named	O
ALGB	B-Application
in	O
1993	O
,	O
it	O
was	O
developed	O
by	O
the	O
French	O
mathematician	O
for	O
the	O
HP	O
48SX	B-Device
.	O
</s>
<s>
Over	O
time	O
,	O
the	O
system	O
integrated	O
a	O
lot	O
of	O
functionality	O
from	O
another	O
math	O
pack	O
for	O
the	O
HP48	B-Device
series	O
,	O
ALG48	O
by	O
Mika	O
Heiskanen	O
and	O
Claude-Nicolas	O
Fiechter	O
.	O
</s>
<s>
At	O
some	O
point	O
,	O
ALGB	B-Application
was	O
renamed	O
into	O
Erable	B-Application
,	O
a	O
French	O
play-on-words	O
on	O
another	O
CAS	O
named	O
Maple	B-Language
.	O
</s>
<s>
Compatible	O
with	O
the	O
HP	O
48S	O
,	O
48SX	B-Device
,	O
48G	B-Device
,	O
48G+	B-Device
,	O
48GX	B-Device
,	O
Erable	B-Application
became	O
one	O
of	O
the	O
"	O
must-have	O
"	O
software	O
packages	O
to	O
be	O
installed	O
by	O
advanced	O
users	O
of	O
these	O
calculators	O
.	O
</s>
<s>
When	O
Hewlett-Packard	O
developed	O
the	O
HP	O
49G	O
in	O
1999	O
,	O
the	O
Erable	B-Application
and	O
ALG48	O
packages	O
became	O
an	O
integral	O
part	O
of	O
the	O
calculator	O
's	O
firmware	O
,	O
now	O
just	O
named	O
HP49	O
CAS	O
.	O
</s>
<s>
As	O
HP	O
CAS	O
it	O
also	O
showed	O
up	O
in	O
the	O
HP	O
40G	O
,	O
40gs	B-Device
,	O
49g+	B-Device
,	O
48gII	B-Device
and	O
50g	B-Device
and	O
was	O
maintained	O
by	O
Parisse	O
up	O
to	O
2006	O
.	O
</s>
<s>
Based	O
on	O
his	O
experiences	O
with	O
Erable	B-Application
,	O
Parisse	O
started	O
developing	O
a	O
new	O
and	O
more	O
general	O
CAS	O
system	O
named	O
Xcas	B-Language
/	O
Giac	O
in	O
2000	O
.	O
</s>
<s>
It	O
is	O
written	O
in	O
C++	B-Language
rather	O
than	O
System	O
RPL	O
.	O
</s>
<s>
This	O
system	O
was	O
integrated	O
into	O
the	O
HP	B-Device
Prime	I-Device
in	O
2013	O
under	O
a	O
dual-license	O
scheme	O
.	O
</s>
<s>
The	O
last	O
stable	O
stand-alone	O
version	O
of	O
Erable	B-Application
for	O
the	O
HP	O
48	B-Device
series	O
is	O
3.024	O
(	O
1998-08-06	O
)	O
,	O
with	O
source	O
code	O
as	O
of	O
1998-07-14	O
available	O
under	O
the	O
GNU	B-License
GPL	I-License
.	O
</s>
<s>
Parts	O
of	O
the	O
CAS	O
system	O
for	O
the	O
HP	O
49/50	O
series	O
(	O
version	O
4	O
)	O
were	O
released	O
as	O
open-source	O
under	O
the	O
LGPL	B-Application
(	O
since	O
some	O
parts	O
of	O
the	O
CAS	O
,	O
which	O
are	O
copyrighted	O
by	O
Hewlett-Packard	O
,	O
remain	O
proprietary	O
software	O
)	O
and	O
were	O
maintained	O
by	O
Parisse	O
up	O
to	O
2006-02-02	O
(	O
for	O
firmware	O
2.14	O
)	O
,	O
and	O
2006-09-19	O
(	O
for	O
firmware	O
2.15	O
(	O
2009-04-21	O
)	O
and	O
2.16	O
(	O
2012-04-26	O
)	O
)	O
.	O
</s>
