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Mathematics
Mathematics
Problem
Let
f
:
A
→
B
f:A\to B
f
:
A
→
B
and let
I
B
:
B
→
B
I_B:B\to B
I
B
:
B
→
B
be the identity function on
B
B
B
. Explain briefly why
I
B
∘
f
=
f
I_B\circ f=f
I
B
∘
f
=
f
.
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