Physics嗰啲無睇唔評論
-1/12嗰條講啲唔講啲我覺得好反感
佢好似係講緊啲唔知乜鬼特別summability/summation (我無學)
但又無清楚講明
結果一個正常學過convergence嘅觀眾會覺得佢哋喺度唔知做乜鳩
無學過真心唔知
佢將啲divergent series搞嚟搞去呢種做法我接受唔到
通常話assume converge再搞一大輪係比局外人睇
summability 呢個概念好似係d 咩special functions, harmonic analysis 有用
例如 sum (-1)^n "=" 0 實質上係想講 lim sum_N [(-1)^n]/n = 0
好似仲有一門野係專搞呢D divergent series 比D summability 的意義比佢地, 不過我唔太清楚詳細係點