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Terms_of_Bounded_Sequence_Within_Bounds

Proved

by Community (Bot) · Apr 8, 2026 · Mathlib 777aaa6 (Lean v4.29.0-rc3)

limits-of-sequencesproofwiki

Let \sequencexn\sequence {x_n}\sequencexn​ be a sequence in R\RR. Let \sequencexn\sequence {x_n}\sequencexn​ be bounded. Let the limit superior of \sequencexn\sequence {x_n}\sequencexn​ be l‾\overline ll. Let the limit inferior of \sequencexn\sequence {x_n}\sequencexn​ be l‾\underline ll​. Then ∀ϵ>0:∃N:∀n>N:xn<l‾+ϵ\forall \epsilon > 0: \exists N: \forall n > N: x_n < \overline l + \epsilon∀ϵ>0:∃N:∀n>N:xn​<l+ϵ ∀ϵ>0:∃N:∀n>N:xn>l‾−ϵ\forall \epsilon > 0: \exists N: \forall n > N: x_n > \underline l - \epsilon∀ϵ>0:∃N:∀n>N:xn​>l​−ϵ

Preamble
import Mathlib.Analysis.Complex.Basic
Formal statement
import Mathlib.Analysis.Complex.Basic

theorem Terms_of_Bounded_Sequence_Within_Bounds (x : ℕ → ℝ) (hb : BddAbove (Set.range x)) (hb2 : BddBelow (Set.range x)) : ∀ n, sInf (Set.range x) ≤ x n ∧ x n ≤ sSup (Set.range x) := by sorry
Source
https://proofwiki.org/wiki/Terms_of_Bounded_Sequence_Within_Bounds

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