<s>
Cadabra	B-Language
is	O
a	O
computer	B-General_Concept
algebra	I-General_Concept
system	I-General_Concept
designed	O
specifically	O
for	O
the	O
solution	O
of	O
problems	O
encountered	O
in	O
classical	O
field	O
theory	O
,	O
quantum	O
field	O
theory	O
and	O
string	O
theory	O
.	O
</s>
<s>
The	O
first	O
version	O
of	O
Cadabra	B-Language
was	O
developed	O
around	O
2001	O
for	O
computing	O
higher-derivative	O
string	O
theory	O
correction	O
to	O
supergravity	O
.	O
</s>
<s>
Released	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
,	O
Cadabra	B-Language
is	O
free	B-Application
software	I-Application
.	O
</s>
<s>
Cadabra	B-Language
has	O
extensive	O
functionality	O
for	O
tensor	B-Device
polynomial	O
simplification	O
including	O
multi-term	O
symmetries	O
,	O
fermions	O
and	O
anti-commuting	O
variables	O
,	O
Clifford	O
algebras	O
and	O
Fierz	O
transformations	O
,	O
implicit	O
coordinate	O
dependence	O
,	O
multiple	O
index	O
types	O
and	O
many	O
more	O
.	O
</s>
<s>
The	O
input	O
format	O
is	O
a	O
subset	O
of	O
TeX	B-Application
.	O
</s>
<s>
Both	O
a	O
command-line	B-Application
and	O
a	O
graphical	B-Application
interface	I-Application
are	O
available	O
.	O
</s>
<s>
A	O
Java	B-Language
program	O
inspired	O
by	O
Cadabra	B-Language
called	O
was	O
developed	O
between	O
2013	O
and	O
2016	O
.	O
</s>
<s>
It	O
achieved	O
faster	O
speeds	O
for	O
most	O
index	O
contractions	O
with	O
an	O
approach	O
based	O
on	O
the	O
graph	O
isomorphism	O
problem	O
rather	O
than	O
canonicalisation	B-General_Concept
.	O
</s>
