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Combination_Theorem_for_Sequences_Real

Proved

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

analysislimitsproofwikisequences

Let \sequencexn\sequence {x_n}\sequencexn​ and \sequenceyn\sequence {y_n}\sequenceyn​ be sequences in R\RR. Let \sequencexn\sequence {x_n}\sequencexn​ and \sequenceyn\sequence {y_n}\sequenceyn​ be convergent to the following limits lim⁡n→∞xn=l\displaystyle \lim_{n \mathop \to \infty} x_n = ln→∞lim​xn​=l lim⁡n→∞yn=m\displaystyle \lim_{n \mathop \to \infty} y_n = mn→∞lim​yn​=m Let λ,μ∈R\lambda, \mu \in \Rλ,μ∈R. Then the following results hold === Sum Rule === === Difference Rule === === Multiple Rule === === Combined Sum Rule === === Product Rule === === Quotient Rule ===

Preamble
import Mathlib.Analysis.Complex.Basic
Formal statement
theorem Combination_Theorem_for_Sequences_Real {x y : ℕ → ℝ} {a b : ℝ} (hx : Filter.Tendsto x Filter.atTop (nhds a)) (hy : Filter.Tendsto y Filter.atTop (nhds b)) : Filter.Tendsto (fun n => x n + y n) Filter.atTop (nhds (a + b)) := by sorry
Source
https://proofwiki.org/wiki/Combination_Theorem_for_Sequences/Real

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