[數撚圍爐區] What is Mathematics? (4)
吾不會數學
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Consider lim n→∞ ∑ g(x_n)
其實幾時先知時候個limit 唔可以擺入個summation
其實幾時先知時候個limit 唔可以擺入個summation
lim_{n->∞} Σ_{i=1}^n 1/n
= Σ_{i=1}^n lim_{n->∞} 1/n
= Σ_{i=1}^n 0
= 0
= Σ_{i=1}^n lim_{n->∞} 1/n
= Σ_{i=1}^n 0
= 0
佢話咗個summation唔depend on n
連 orthogonal orthonormal都搞唔掂
