How to prove that real numbers and positive real numbers have same cardinality? I know you have to construct a bijective function mapping one to the other. But I have trouble finding this particular function. Thanks!

  • 9
    $\begingroup$ $\exp(x)$ works? $\endgroup$
    – janmarqz
    Jan 28, 2014 at 2:26

1 Answer 1


This question has been answered in a comment:

$\exp(x)$ works? – janmarqz Jan 28 at 2:26


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