Exploring the Existence and Value of inf(X)

In summary, the conversation is about determining the existence and value of the infimum of the set X, which is defined as {1/n: n\inN}. The participants suggest using the definition of infimum to prove its existence and determine its value.
  • #1
major_maths
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Homework Statement


Let X={1/n: n[itex]\in[/itex]N} (where N is the set of natural numbers)
i) Does inf(X) exist?
ii) What is inf(X)?


Homework Equations





The Attempt at a Solution


I think I should try to prove inf(X) exists by considering it a Lower Limit, but I don't know how to go about doing that. Any help would be appreciated!
 
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  • #2
Just follow the definition.
The infiimum is the greatest number which is least than any other number in X.
 
  • #3
Well, surely you can guess at what the inf might be, right? Let's say you think that x is the inf. Now, just show that x is a lower bound and if y is bigger than x, then y isn't lower bound.
 

What is inf(X) and why is it important to explore its existence and value?

inf(X) is a mathematical concept that represents the greatest lower bound of a set of numbers or values. It is important to explore its existence and value because it allows us to better understand the behavior and limits of a given set of data or variables.

How is inf(X) calculated?

inf(X) is calculated by finding the smallest number or value in a set that is larger than or equal to all other numbers or values in the set. This is known as the greatest lower bound.

What is the significance of inf(X) in real-world applications?

In real-world applications, inf(X) can be used to determine the minimum or maximum values of a given set, which can be helpful in decision-making and problem-solving processes. It can also be used in optimization and control problems.

Are there any limitations to using inf(X) in mathematical analysis?

Yes, inf(X) has some limitations, such as the fact that it may not exist for certain sets of numbers or values. It also cannot be used to determine the exact minimum or maximum values in a set, only the greatest lower bound.

How can the existence and value of inf(X) be explored and verified?

The existence and value of inf(X) can be explored and verified through mathematical proofs and calculations. It can also be verified through computer simulations and experiments in real-world situations.

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