Measure Theory 2.4 : Sets of Measure Zero

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In this video, I introduce the Cantor Set, and prove that it and countable sets (including the rationals) have measure zero.

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Really like how you explained the first proof.

carlostarelo
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Good work boss... Keep going.. best of luck

manojbhosale
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Hi! I am studying this subject and there is a question that I want help with. The question is if A and B are measurable sets such that B is contained in A and m(B)< infinity, then m(A~B) = m(A) - m(B).
So I solved it using countable additivity on A= B union A~B and in the end I subtracted measure of B from both the sides and we are able to subtract measure of B from both the sides because measure of B is finite. So tell me 1) Is the proof ok and 2) what will happen if measure of B is not given finite in the question.

Shalini
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Hi, I want to ask you that there is a set E of points in [0, 1] interval such that we remove the decimal expansion of 5 from [0, 1] and show it is uncountable? I am confused which approach should I take the way we show real numbers are uncountable or use Cantor set ternary expansion approach.

Shalini
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Hello, what is the measure of Real Numbers?

mohammadghani
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Why are not all the numbers in C rational given how it is defined? If this is easy, please don't give me the answer, just tell me it's easy and I will try to prove it? It would help if the proof involves a diagonal argument, as an example of what I consider easy. If it is not however easy, please give me clue how to prove it. Thank you.

VaSavoir
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apart from the amazing lesson, you're so cute =))

NgaNguyenThi-pcin