It seems obvious that the result of addition does not change when the order is altered, but this is not the case with infinite sums. When the order of terms in an infinite sum is changed, it can lead to unexpected results.

[BGM]
ほのぼのワルツ【リコーダー】(https://commons.nicovideo.jp/)
Caravan

[Materials]
VOICEVOX:ずんだもん
VOICEVOX:四国めたん
立ち絵(坂本アヒル様)
効果音ラボ
pixabay

#math