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Mathematics
Mathematics
Problem
Let
A
=
{
1
,
2
}
A=\{1,2\}
A
=
{
1
,
2
}
and
B
=
{
1
,
2
,
3
}
B=\{1,2,3\}
B
=
{
1
,
2
,
3
}
. Consider the relations
R
=
{
(
1
,
2
)
,
(
2
,
1
)
}
R=\{(1,2),(2,1)\}
R
=
{(
1
,
2
)
,
(
2
,
1
)}
and
S
=
{
(
1
,
2
)
,
(
2
,
1
)
,
(
1
,
3
)
}
S=\{(1,2),(2,1),(1,3)\}
S
=
{(
1
,
2
)
,
(
2
,
1
)
,
(
1
,
3
)}
from
A
A
A
to
B
B
B
. Explain why
R
R
R
is a subrelation of
S
S
S
.
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