How to use epsilon K proof to show a limit using Calculus?

In summary, a "Calculus: epsilon K proof" is a type of mathematical proof used in calculus to demonstrate the convergence of a sequence or series. It is an important tool in calculus, as it allows for the formal proof of convergence and helps us understand the behavior of functions. The proof works by setting a small value for epsilon (ε) and finding a corresponding value for K, and it involves several key components such as algebraic manipulation and stating the conclusion. However, there are limitations to this method, including its inability to work for all types of sequences or series and its lack of information about the actual limit.
  • #1
Winzer
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Homework Statement


Use [tex]\epsilon[/tex] K proof to show:
[tex] lim \left(\frac{n^2 + 2n + 1}{2n^2 + 3n + 2}\right) = \frac{1}{2} [/tex]


Homework Equations


Hint first show
[tex] \left| \frac{n^2 + 2n + 1}{2n^2 + 3n + 2}-\frac{1}{2}\right| \leq \frac{1}{2n}, \hspace{0.5cm} n\epsilon N[/tex]



The Attempt at a Solution


See the pdf. Please let me know if my argument can be more thorough.
 

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  • #2
At one point you have
[tex]\frac{1}{n(2n+1)}< \epsilon \doublearrow \frac{1}{2n}< \epsilon[/tex]
What you should say is "Because
[tex]\frac{1}{2(2n+1)}< \frac{1}{2n}[/tex]
if
[tex]\frac{1}{2n}< \epsilon[/tex]
it will be true that
[tex]\frac{1}{2(2n+1)}< \epsilon[/tex]
 

FAQ: How to use epsilon K proof to show a limit using Calculus?

What is a "Calculus: epsilon K proof"?

A "Calculus: epsilon K proof" is a type of mathematical proof used in calculus to show the convergence of a sequence or series. It involves using the concepts of epsilon (ε) and K to show that the terms of the sequence or series get closer and closer to a certain value as the number of terms increases.

Why is the "epsilon K proof" important in calculus?

The "epsilon K proof" is important in calculus because it allows us to formally prove the convergence of a sequence or series, which is a fundamental concept in calculus. It also helps us to understand the behavior of functions and make accurate approximations.

How does the "epsilon K proof" work?

The "epsilon K proof" works by setting a small value for epsilon (ε), which represents the desired level of accuracy, and then finding a corresponding value for K, which represents the number of terms required for the sequence or series to be within ε of its limit. This is done by manipulating the terms of the sequence or series algebraically until they fit the desired format.

What are the key components of a "Calculus: epsilon K proof"?

The key components of a "Calculus: epsilon K proof" include setting a value for epsilon (ε), finding a corresponding value for K, using algebraic manipulation to prove the convergence of the sequence or series, and stating the conclusion that the sequence or series converges.

Are there any limitations to the "epsilon K proof"?

Yes, there are some limitations to the "epsilon K proof" method. It may not work for all types of sequences or series, and in some cases, it may be difficult to determine the value of K. Additionally, it does not provide any information about the actual limit of the sequence or series, only that it exists.

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