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Answers for “为什么 zeta 函数级数在区间 (1, infinity) 上不一致收敛?”

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The distinction lies in the quantifier order. For pointwise convergence, one first fixes a specific point xx, then chooses ϵ>0\epsilon>0, and finds an index NN that may depend on both ϵ\epsilon and xx.

Conditions: A sequence of functions fnf_n and a limit function ff are defined on a region.; Pointwise convergence: ∀x,∀ϵ>0,∃N\forall x, \forall \epsilon>0, \exists N such that n≥N  ⟹  ∣f(x)−fn(x)∣<ϵn\ge N \implies |f(x)-f_n(x)|<\epsilon.; Uniform convergence: ∀ϵ>0,∃N\forall \epsilon>0, \exists N such that n≥N  ⟹  ∣f(x)−fn(x)∣<ϵn\ge N \implies |f(x)-f_n(x)|<\epsilon for all xx in the region.