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A comment on How many real numbers exist? New proof moves closer to an answer. Parent comment
0 <-> sandwich
1 <-> 0
...
n+1 <-> n
By definition, if you can biject two sets, they have the same cardinality.
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0 <-> sandwich
1 <-> 0
...
n+1 <-> n
By definition, if you can biject two sets, they have the same cardinality.