序列(Sequence)
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A sequence {pn}\lbrace p_n \rbrace {pn} in metric space (X,d)(X, d)(X,d) is said to be converge in XXX if there is a point p∈Xp \in X p∈X such that:∀ϵ>0\forall \epsilon > 0 ∀ϵ>0 ∃ n0∈N\exists \ n_0 \in \mathbb{N}∃ n0∈N ∋ d(pn,p)
