Real Analysis | The countability of the rational numbers.
8:18
Real Analysis | The uncountability of ℝ
18:39
Real Analysis | Equinumerosity
8:58
Intro to Open Sets (with Examples) | Real Analysis
12:14
Introduction to the Cardinality of Sets and a Countability Proof
16:30
Real Analysis | The density of Q and other consequences of the Axiom of Completeness.
13:00
Rationals are Countable
6:37
Infinite Fractions - Numberphile
22:16