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The next 3 videos will throw light upon the concept of neighbourhoods and upperbounds and lowerbounds.
The first video will define the concept of a neighbourhood of a set and interpret it on a real line. The second video will then make us understand what the bounds of a set are. The concept of upper bounds and lower bounds will in turn let us find the greatest lower bound and the lowest upper bound for any set.
Finally in the third video we will talk about the lowest / least upper bound of a set which is called the supremum.
Neighbourhood definition
Bounded sets
Supremum of a set
