Real Analysis Lecture 2.2 Countable Sets

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00:00 Recap
01:03 Problems
01:34 Countable Sets
08:03 A More Convenient Criterion
15:25 Union of Two Countable Sets is Countable
20:54 NxN is countable.
24:06 Countable Union of Countable Sets is Countable
27:12 Rationals are Countable

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Errata: 1) At 01:34, the set 'S' should be the set 'X'.
2) At 30:09, the subscript in the big union symbol should be 'i' instead of 'j'.

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