Question: Proposition 1 . 3 . If minN then ~~ - { } . Proof idea. Define a function : - > - { } by

Proposition
1
.
3
.
If minN then
~~
-
{
}
.
Proof idea. Define a function
:
->
-
{
}
by
(
)
=
{
=
.
Show that
is a bijection.

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