Proof: Supremum and Infimum are Unique | Real Analysis

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If a subset of the real numbers has a supremum or infimum, then they are unique! Uniqueness is a tremendously important property, so although it is almost complete trivial as far as difficulty goes in this case, we would be ill-advised to not prove these properties! In this lesson we'll be proving the uniqueness of suprema and infima.

Recall that the supremum of A, denoted sup A, is the least upper bound of A. The infimum of A, denoted inf A, is the greatest lower bound of A.

I hope you find this video helpful, and be sure to ask any questions down in the comments!

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The outro music is by a favorite musician of mine named Vallow, who, upon my request, kindly gave me permission to use his music in my outros. I usually put my own music in the outros, but I love Vallow's music, and wanted to share it with those of you watching. Please check out all of his wonderful work.

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Can Supremum and Infimum of a set be the same?

siphendulwezaza
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great video, but could you do a proof showing that a infimum of a set exists while the min does not

mirandaatangdithebe
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This for this explanation. It most certainly helped.

valeriereid
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Blue M In such functions value of f(x) keeps decreasing an approx value is taken and called infimum.
The sum of the series is found for as x tends to infinity.

anjaneyasharma
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Super interesting proof. I didn't expect it to be so straightforward. Thank you very much. Have a good day! ❤️

Zinani-zb
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How can there be a two different suprema s1 and s2 if it is unique. Is it considered to be both s1

lalhriatpuiahmar
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Thanks. Damn. You make these seem easy

realndu