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!
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9$\exp(x)$ works? – janmarqz Jan 28 '14 at 02:26
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This question has been answered in a comment:
$\exp(x)$ works? – janmarqz Jan 28 at 2:26
Jessica B
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