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Beth number
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== Relation to the aleph numbers == Assuming the [[axiom of choice]], infinite cardinalities are [[total order|linearly ordered]]; no two cardinalities can fail to be comparable. Thus, since by definition no infinite cardinalities are between <math>\aleph_0</math> and <math>\aleph_1</math>, it follows that :<math>\beth_1 \ge \aleph_1.</math> Repeating this argument (see [[transfinite induction]]) yields <math>\beth_\alpha \ge \aleph_\alpha</math> for all ordinals <math>\alpha</math>. The [[continuum hypothesis]] is equivalent to :<math>\beth_1=\aleph_1.</math> The [[Continuum hypothesis#Generalized continuum hypothesis|generalized continuum hypothesis]] says the sequence of beth numbers thus defined is the same as the sequence of [[aleph number]]s, i.e., <math>\beth_\alpha = \aleph_\alpha</math> for all ordinals <math>\alpha</math>.
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