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Mathematics
Mathematics
Problem
8. Let A and B be sets. Show that
f
:
A
×
B
→
B
×
A
f: \mathrm{A} \times \mathrm{B} \rightarrow \mathrm{B} \times \mathrm{A}
f
:
A
×
B
→
B
×
A
such that
f
(
a
,
b
)
=
(
b
,
a
)
f(a, b)=(b, a)
f
(
a
,
b
)
=
(
b
,
a
)
is bijective function.
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