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Mathematics
Problem
For any relation
R
R
R
from a non-empty set
A
A
A
to a non-empty set
B
B
B
, which of the following statements is always true? a)
Ran
(
R
)
=
B
\operatorname{Ran}(R)=B
Ran
(
R
)
=
B
b)
Dom
(
R
)
⊆
A
\operatorname{Dom}(R)\subseteq A
Dom
(
R
)
⊆
A
c)
Dom
(
R
)
=
A
\operatorname{Dom}(R)=A
Dom
(
R
)
=
A
d)
Ran
(
R
)
⊆
A
\operatorname{Ran}(R)\subseteq A
Ran
(
R
)
⊆
A
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