EDB — 0D4

Exercises

1. [0D4]Difficulty:*. Show that from any sequence \((a_ n)_ n⊆ ℝ\) we can extract a monotonic subsequence such that

   \[ \lim _{k→∞}a_{n_ k}=\limsup _{n→∞} a_ n \quad . \]
   Solution 1

   [0D5]↺↻