<s>
In	O
computer	B-General_Concept
science	I-General_Concept
,	O
FO( 	O
.	O
)	O
</s>
<s>
FO-dot	B-Language
)	O
is	O
a	O
knowledge	O
representation	O
language	O
based	O
on	O
first-order	O
logic	O
(	O
FO	O
)	O
.	O
</s>
<s>
Axioms	B-Algorithm
,	O
i.e.	O
,	O
logic	O
sentences	O
about	O
possible	O
worlds	O
,	O
</s>
<s>
In	O
this	O
code	O
,	O
A	O
→	O
B	O
indicates	O
a	O
function	O
from	O
A	O
to	O
B	O
,	O
denotes	O
integers	O
,	O
denotes	O
the	O
booleans	B-General_Concept
,	O
¬	O
denotes	O
negation	O
,	O
and	O
⇒	O
denotes	O
material	O
conditional	O
.	O
</s>
