<s>
State	B-Algorithm
space	I-Algorithm
search	I-Algorithm
is	O
a	O
process	O
used	O
in	O
the	O
field	O
of	O
computer	B-General_Concept
science	I-General_Concept
,	O
including	O
artificial	B-Application
intelligence	I-Application
(	O
AI	B-Application
)	O
,	O
in	O
which	O
successive	O
configurations	O
or	O
states	O
of	O
an	O
instance	O
are	O
considered	O
,	O
with	O
the	O
intention	O
of	O
finding	O
a	O
goal	O
state	O
with	O
the	O
desired	O
property	O
.	O
</s>
<s>
State	B-Algorithm
space	I-Algorithm
search	I-Algorithm
often	O
differs	O
from	O
traditional	O
computer	B-General_Concept
science	I-General_Concept
search	B-Application
methods	O
because	O
the	O
state	O
space	O
is	O
implicit	O
:	O
the	O
typical	O
state	O
space	O
graph	O
is	O
much	O
too	O
large	O
to	O
generate	O
and	O
store	O
in	O
memory	B-General_Concept
.	O
</s>
<s>
A	O
solution	O
to	O
a	O
combinatorial	B-Algorithm
search	I-Algorithm
instance	O
may	O
consist	O
of	O
the	O
goal	O
state	O
itself	O
,	O
or	O
of	O
a	O
path	O
from	O
some	O
initial	O
state	O
to	O
the	O
goal	O
state	O
.	O
</s>
<s>
In	O
state	B-Algorithm
space	I-Algorithm
search	I-Algorithm
,	O
a	O
state	O
space	O
is	O
formally	O
represented	O
as	O
a	O
tuple	O
,	O
in	O
which	O
:	O
</s>
<s>
In	O
many	O
state	O
spaces	O
a	B-Application
is	I-Application
a	O
constant	O
,	O
but	O
this	O
is	O
not	O
always	O
true	O
.	O
</s>
<s>
According	O
to	O
Poole	O
and	O
Mackworth	O
,	O
the	O
following	O
are	O
uninformed	O
state-space	O
search	B-Application
methods	O
,	O
meaning	O
that	O
they	O
do	O
not	O
have	O
any	O
prior	O
information	O
about	O
the	O
goal	O
's	O
location	O
.	O
</s>
<s>
These	O
methods	O
take	O
the	O
goal	O
's	O
location	O
in	O
the	O
form	O
of	O
a	O
heuristic	B-Algorithm
function	I-Algorithm
.	O
</s>
<s>
Poole	O
and	O
Mackworth	O
cite	O
the	O
following	O
examples	O
as	O
informed	O
search	B-Application
algorithms	I-Application
:	O
</s>
