Proof of convergent sequences

Click For Summary
SUMMARY

The discussion focuses on proving that if two subsequences, (a2n) and (a2n-1), converge to the same limit, then the original sequence (an) also converges to that limit. The proof involves applying the ε-δ definition of convergence for both subsequences and adapting it to the original sequence. Specifically, the adaptation requires substituting δ with n and ensuring n exceeds a certain threshold N.

PREREQUISITES
  • Understanding of convergence in sequences
  • Familiarity with ε-δ definitions in mathematical analysis
  • Knowledge of subsequences and their properties
  • Basic principles of limits in calculus
NEXT STEPS
  • Study the ε-δ definition of limits in detail
  • Explore the properties of convergent sequences and subsequences
  • Learn about the implications of convergence in real analysis
  • Investigate examples of convergent and divergent sequences
USEFUL FOR

Mathematics students, educators, and anyone studying real analysis or sequences and series will benefit from this discussion.

e179285
Messages
24
Reaction score
0
How can we prove this statement?


It two subsequences (a2n) and (a2n-1) converge to the same value,then (an)) converges to that value also.
 
Physics news on Phys.org
hi e179285! :smile:

just write out the δ,ε definition twice, once for each series, then adapt it :wink:

(instead of δ, and x < δ, you use n, and n > N)
 

Similar threads

Replies
15
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
Replies
4
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
Replies
3
Views
2K
Replies
6
Views
3K
Replies
1
Views
1K
Replies
11
Views
2K
  • · Replies 7 ·
Replies
7
Views
3K