Measurable functions - Definition and Motivation | Measure Theory

We learn about measurable functions, the motivation behind and have a look at a proposition that will help us determine if a given function is measurable or not.
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Timestamps in this video:
00:00 Introduction.
00:20 Definition.
00:53 Motivation.
02:06 Notation.
04:55 WARNING.
09:08 Proposition: Equivalences.
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