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Rational Numbers are Countable
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We prove that the rational numbers are countable in two ways. The first approach is classical: define the height of a rational number and use a result on countable unions of countable sets. The second is a cool proof of Campbell using base 11.
#mikedabkowski, #mikethemathematician, #profdabkowski, #realanalysis
#mikedabkowski, #mikethemathematician, #profdabkowski, #realanalysis
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