What is the limit of the sequence (Xn) = (n!)^(1/n)?

In summary, the "N-th root of n factorial" is a mathematical expression that represents the number that, when multiplied by itself N times, gives the product of all positive integers from 1 to n. It is calculated by taking the nth root of n factorial and has various applications in mathematics. It can be a decimal or fraction and has special properties such as being a rational number and having a limit of 1 as n and N approach infinity. It also has connections to advanced mathematical functions.
  • #1
steviet
3
0
I'm working on the limit of the sequence
(Xn) = (n!)^(1/n)
Pretty sure it diverges as n goes to infinity,
but unsure how to show it.
Any hint would ge greatly appreciated.
 
Physics news on Phys.org
  • #2
Your instincts are good. Take a log and use Stirling's formula. That's one way.
 
  • #3
an elemetary proof is to take log so you get (1/n)log[n]! then you get [log1+Log2+log3...logn]/n

set bounds for 1<n<11 sum truncate terms
you get sum between 0 and 1

for 11<n<101 get sum between 10 and 20

you can see how this diverges
 

Related to What is the limit of the sequence (Xn) = (n!)^(1/n)?

1. What is the "N-th root of n factorial"?

The "N-th root of n factorial" is a mathematical expression that represents the number that, when multiplied by itself N times, gives the product of all positive integers from 1 to n. In other words, it is the number that, when raised to the power of N, equals n factorial.

2. How is the "N-th root of n factorial" calculated?

The "N-th root of n factorial" is calculated by taking the nth root of n factorial. This can be done through a mathematical formula or by using a calculator.

3. What is the significance of the "N-th root of n factorial"?

The "N-th root of n factorial" has various applications in mathematics, including in the study of combinatorics and probability. It is also used in the calculation of certain mathematical constants, such as the famous number e.

4. Can the "N-th root of n factorial" be a decimal or fraction?

Yes, the "N-th root of n factorial" can be a decimal or fraction, depending on the values of n and N. For example, if n is a perfect square and N is half of n, the "N-th root of n factorial" will be a whole number. Otherwise, it will be a decimal or fraction.

5. Are there any special properties of the "N-th root of n factorial"?

Yes, the "N-th root of n factorial" has several special properties, such as being a rational number for certain values of n and N, and having a limit of 1 as n and N approach infinity. It also has connections to the Gamma function and the Riemann zeta function in advanced mathematics.

Similar threads

  • Calculus and Beyond Homework Help
Replies
2
Views
562
  • Calculus and Beyond Homework Help
Replies
8
Views
1K
  • Calculus and Beyond Homework Help
Replies
17
Views
1K
  • Calculus and Beyond Homework Help
Replies
1
Views
506
  • Calculus and Beyond Homework Help
Replies
4
Views
1K
  • Calculus and Beyond Homework Help
Replies
6
Views
1K
  • Calculus and Beyond Homework Help
Replies
6
Views
607
  • Calculus and Beyond Homework Help
Replies
12
Views
1K
  • Calculus and Beyond Homework Help
Replies
9
Views
2K
  • Calculus and Beyond Homework Help
Replies
7
Views
1K
Back
Top