Limit of upper semicontinuous function

In summary, a limit of upper semicontinuous function is the maximum value that a function can take on at a certain point, or the supremum of all values of the function at points near that point. It differs from a limit of a continuous function in that it allows for jumps or gaps in the graph and may not exist at all points. Some applications of limits of upper semicontinuous functions include stability analysis, resource allocation, and modeling physical phenomena. To determine the limit of an upper semicontinuous function, you need to determine the behavior of the function at points near the given point and take the supremum of all values. And finally, a limit of upper semicontinuous function can be infinity if the function
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ozkan12
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for any upper semi continuous how we can take limit ? limit or limsup ? which one is true ?
 
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  • #2
ozkan12 said:
for any upper semi continuous how we can take limit ? limit or limsup ? which one is true ?

Well, you're definitely not guaranteed to be able to take the limit. The lim sup is guaranteed to exist, but it's not necessarily equal to the function value at which the function is upper semi-continuous. The wiki is fairly helpful, I think.
 

FAQ: Limit of upper semicontinuous function

What is a limit of upper semicontinuous function?

A limit of upper semicontinuous function is a mathematical concept that describes the behavior of a function as the input values approach a certain point. It is defined as the maximum value that the function can take on at that point, or the supremum of all values of the function at points near the given point.

How is a limit of upper semicontinuous function different from a limit of a continuous function?

A limit of upper semicontinuous function is different from a limit of a continuous function in that it allows for the function to have jumps or gaps in its graph, whereas a continuous function must have a smooth and unbroken graph. Additionally, a limit of upper semicontinuous function may not exist at all points, while a limit of a continuous function always exists.

What are some real-world applications of limits of upper semicontinuous functions?

Limits of upper semicontinuous functions have various applications in fields such as economics, engineering, and physics. They can be used to analyze the stability of systems, optimize resource allocation, and model physical phenomena such as fluid flow and electrical circuits.

How do you determine the limit of an upper semicontinuous function?

To determine the limit of an upper semicontinuous function, you first need to determine the behavior of the function at points near the given point. Then, you take the supremum of all values of the function at those points. This value is the limit of the function at the given point.

Can a limit of upper semicontinuous function be infinity?

Yes, a limit of upper semicontinuous function can be infinity if the function has no upper bound at points near the given point. In this case, the supremum of all values of the function at those points would be infinity, and that would be the limit of the function at the given point.

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