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Mathematics
Mathematics
Problem
Let
f
:
{
1
,
2
,
3
}
→
R
f:\{1,2,3\}\to\mathbb{R}
f
:
{
1
,
2
,
3
}
→
R
. Explain why the expression
f
(
4
)
f(4)
f
(
4
)
is not defined.
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