Prove this statement (limits and sequences)

  • Thread starter Thread starter lep11
  • Start date Start date
  • Tags Tags
    Sequences
Click For Summary
SUMMARY

The discussion centers on proving the statement that if the limit of a function f(x) approaches a as x approaches infinity, and if a sequence xn approaches infinity as n approaches infinity, then the limit of f(xn) must also approach a as n approaches infinity. Participants emphasize the necessity of applying the definitions of convergence for both the function and the sequence to establish this proof rigorously.

PREREQUISITES
  • Understanding of limits in calculus
  • Familiarity with sequences and their convergence
  • Knowledge of the epsilon-delta definition of limits
  • Basic experience with mathematical proofs
NEXT STEPS
  • Study the epsilon-delta definition of limits in detail
  • Explore convergence of sequences and their properties
  • Review examples of limit proofs in calculus
  • Practice constructing formal mathematical proofs
USEFUL FOR

Students studying calculus, particularly those focusing on limits and sequences, as well as educators seeking to clarify these concepts in a teaching context.

lep11
Messages
380
Reaction score
7

Homework Statement


Let lim f(x)=a as x appr. infinity
Let xn be a sequence so that lim xn=infinity as n appr. infinity. Prove using definitions that then lim f(xn)=a as n appr. infinity.

Homework Equations


[/B]

The Attempt at a Solution


I have had hard time trying to grasp how to begin with this...

Because lim f(x)=a as x appr. infinity there
 
Last edited:
Physics news on Phys.org
lep11 said:
Because lim f(x)=a as x appr. infinity there
And that is good otherwise the statement would be wrong.

I would try to use the elementary definitions of convergence for the function and the sequence.
 

Similar threads

  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 11 ·
Replies
11
Views
2K
  • · Replies 13 ·
Replies
13
Views
4K
Replies
3
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
Replies
6
Views
7K
  • · Replies 2 ·
Replies
2
Views
1K