Conclusion of Cardinality for infinite sets - Foundations of Pure Mathematics - Dr Joel Feinstein

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Foundations of Pure Mathematics

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The conclusion of the nineteenth lecture in Dr Joel Feinstein's G11FPM Foundations of Pure Mathematics module covers a brief discussion of sequences using up sets. Proof that the union of two countable sets is countable. These videos are also available on YouTube at: https://www.youtube.com/playlist?list=PLpRE0Zu_k-BzsKBqQ-HEqD6WVLIHSNuXa Dr Feinstein's blog may be viewed at: http://explainingmaths.wordpress.com Dr Joel Feinstein is an Associate Professor in Pure Mathematics at the Universit