EDB — 0B7

Exercises

1. [0B7] (Solved on 2022-11-24) Let \(a_{n,m}\) be a real sequence with two indices \(n∈ I,m∈ J\), show that

   \[ \sup _{n∈ I,m∈ J}a_{n,m} = \sup _{n∈ I} \Big(\sup _{m∈ J} a_{n,m} \Big)~ ~ . \]
   Solution 1

   [0B8]↺↻