Prove that lim sup(x_n) = max(lim sup(y_n), lim sup(z_n))

  • Thread starter drawar
  • Start date
  • #1
drawar
132
0

Homework Statement


Let [itex](x_{n})[/itex] be a bounded sequence. For each [itex]n \in \mathbb{N}[/itex], let [itex]y_{n}=x_{2n}[/itex] and [itex]z_{n}=x_{2n-1}[/itex]. Prove that
[itex]\lim \sup {x_n} = \max (\lim \sup {y_n},\lim \sup {z_n})[/itex]


Homework Equations





The Attempt at a Solution



Don't know if I'm at the right path but I've tried letting [itex]M= \lim \sup {x_n}[/itex], [itex]M_{1}= \lim \sup {y_n}[/itex], and [itex]M_{2} = \lim \sup {z_n}[/itex] and see that [itex]M \geq \max (M_{1}, M_{2})[/itex]. How do I proceed from here to prove that [itex]M = \max (M_{1}, M_{2})[/itex]? Thank you!
 

Answers and Replies

  • #2
funcalys
30
1
Does this observation help?
$\sup {x_n} = \max (\sup {y_n},\sup {z_n})$
 

Suggested for: Prove that lim sup(x_n) = max(lim sup(y_n), lim sup(z_n))

Replies
8
Views
377
Replies
3
Views
388
Replies
2
Views
650
  • Last Post
Replies
7
Views
877
Replies
9
Views
550
Replies
7
Views
1K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
7
Views
2K
Replies
9
Views
398
Top