<s>
In	O
computer	B-General_Concept
science	I-General_Concept
,	O
a	O
term	O
index	O
is	O
a	O
data	O
structure	O
to	O
facilitate	O
fast	O
lookup	O
of	O
terms	O
and	O
clauses	B-Application
in	O
a	O
logic	B-Language
program	I-Language
,	O
deductive	B-General_Concept
database	I-General_Concept
,	O
or	O
automated	B-Application
theorem	I-Application
prover	I-Application
.	O
</s>
<s>
Many	O
operations	O
in	O
automatic	B-Application
theorem	I-Application
provers	I-Application
require	O
search	O
in	O
huge	O
collections	O
of	O
terms	O
and	O
clauses	B-Application
.	O
</s>
<s>
Given	O
a	O
collection	O
of	O
terms	O
(	O
clauses	B-Application
)	O
and	O
a	O
query	O
term	O
(	O
clause	O
)	O
,	O
find	O
in	O
some/all	O
terms	O
related	O
to	O
according	O
to	O
a	O
certain	O
retrieval	O
condition	O
.	O
</s>
<s>
and	O
retrieval	O
,	O
are	O
called	O
term	B-Application
indexing	I-Application
techniques	O
.	O
</s>
<s>
A	O
discrimination	O
tree	O
term	O
index	O
stores	O
its	O
information	O
in	O
a	O
trie	B-General_Concept
data	O
structure	O
.	O
</s>
