<s>
Fuzzy	B-General_Concept
rules	I-General_Concept
are	O
used	O
within	O
fuzzy	O
logic	O
systems	O
to	O
infer	O
an	O
output	O
based	O
on	O
input	O
variables	O
.	O
</s>
<s>
However	O
,	O
in	O
a	O
fuzzy	B-General_Concept
rule	I-General_Concept
,	O
the	O
premise	O
x	O
is	O
A	O
and	O
the	O
consequent	O
y	O
is	O
B	O
can	O
be	O
true	O
to	O
a	O
degree	O
,	O
instead	O
of	O
entirely	O
true	O
or	O
entirely	O
false	O
.	O
</s>
<s>
In	O
a	O
fuzzy	B-General_Concept
rule	I-General_Concept
,	O
modus	O
ponens	O
is	O
extended	O
to	O
generalised	O
modus	O
ponens	O
:	O
.	O
</s>
<s>
Rules	O
can	O
connect	O
multiple	O
variables	O
through	O
fuzzy	B-General_Concept
set	I-General_Concept
operations	I-General_Concept
using	O
t-norms	B-General_Concept
and	O
t-conorms	B-General_Concept
.	O
</s>
<s>
T-norms	B-General_Concept
are	O
used	O
as	O
an	O
AND	O
connector	O
.	O
</s>
<s>
The	O
result	O
of	O
a	O
t-norm	B-General_Concept
operation	O
on	O
these	O
two	O
degrees	O
is	O
used	O
as	O
the	O
degree	O
of	O
truth	O
that	O
fan	O
speed	O
is	O
fast	O
.	O
</s>
<s>
T-conorms	B-General_Concept
are	O
used	O
as	O
an	O
OR	O
connector	O
.	O
</s>
<s>
The	O
result	O
of	O
a	O
t-conorm	B-General_Concept
operation	O
on	O
these	O
two	O
degrees	O
is	O
used	O
as	O
the	O
degree	O
of	O
truth	O
that	O
fan	O
speed	O
is	O
fast	O
.	O
</s>
<s>
T-conorms	B-General_Concept
are	O
less	O
commonly	O
used	O
as	O
rules	O
can	O
be	O
represented	O
by	O
AND	O
and	O
OR	O
connectors	O
exclusively	O
.	O
</s>
