Is x=1 the Solution to nx ~ n ln(n) as n Approaches Infinity?

  • Thread starter japplepie
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In summary, to identify asymptotic equality, compare the growth rates of the functions as the input size increases. Common techniques for solving asymptotic equalities include limit calculus, algebraic manipulation, and using the definition of asymptotic notation. It is not possible to solve an asymptotic equality without using limits. To prove two functions are asymptotically equal, their ratio must approach 1 as the input size increases. Asymptotic equality and asymptotic equivalence are different, with the former meaning the same growth rate and the latter meaning the same growth rate plus a constant factor.
  • #1
japplepie
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How do I solve for x in the relationship below:

nx ~ n ln(n), as n -> infinity

The answer that I'm getting is x=1, but that must be wrong since 1 ~ ln(n) as n-> infinity is wrong.
 
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  • #2
japplepie said:
How do I solve for x in the relationship below:

nx ~ n ln(n), as n -> infinity

The answer that I'm getting is x=1, but that must be wrong since 1 ~ ln(n) as n-> infinity is wrong.

There is no solution: [tex]\frac{\ln n}{n^k} \to \begin{cases} 0 & k > 0 \\ \infty & k \leq 0 \end{cases}[/tex]
 
  • #3
oh boy
 

FAQ: Is x=1 the Solution to nx ~ n ln(n) as n Approaches Infinity?

How do I identify the asymptotic equality in a given problem?

To identify the asymptotic equality, you need to look at the growth rate of the functions involved. If the functions have the same growth rate as the input size increases, then they are asymptotically equal.

What are the common techniques for solving asymptotic equalities?

The most common techniques for solving asymptotic equalities are using limit calculus, algebraic manipulation, and using the definition of asymptotic notation.

Can I solve an asymptotic equality without using limits?

No, limits are essential for solving asymptotic equalities as they help to determine the growth rate of a function as the input size approaches infinity.

How do I prove that two functions are asymptotically equal?

To prove that two functions are asymptotically equal, you need to show that their ratio approaches 1 as the input size increases. This can be done using the limit definition of asymptotic notation.

Is there a difference between asymptotic equality and asymptotic equivalence?

Yes, there is a difference. Asymptotic equality means that the two functions have the same growth rate, while asymptotic equivalence means that they have the same growth rate and differ only by a constant factor.

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