File: Mathlib/MeasureTheory/Constructions/BorelSpace/Metrizable.lean

full_name: measurable_of_tendsto_metrizable'
code: /-- A limit (over a general filter) of measurable functions valued in a (pseudo) metrizable space is
measurable. -/
theorem measurable_of_tendsto_metrizable' {ι} {f : ι → α → β} {g : α → β} (u : Filter ι) [NeBot u]
    [IsCountablyGenerated u] (hf : ∀ i, Measurable (f i)) (lim : Tendsto f u (𝓝 g)) :
    Measurable g 
goal: Measurable g

full_name: measurable_of_tendsto_metrizable
code: /-- A sequential limit of measurable functions valued in a (pseudo) metrizable space is
measurable. -/
theorem measurable_of_tendsto_metrizable {f : ℕ → α → β} {g : α → β} (hf : ∀ i, Measurable (f i))
    (lim : Tendsto f atTop (𝓝 g)) : Measurable g 
goal: Measurable g

full_name: aemeasurable_of_tendsto_metrizable_ae
code: theorem aemeasurable_of_tendsto_metrizable_ae {ι} {μ : Measure α} {f : ι → α → β} {g : α → β}
    (u : Filter ι) [hu : NeBot u] [IsCountablyGenerated u] (hf : ∀ n, AEMeasurable (f n) μ)
    (h_tendsto : ∀ᵐ x ∂μ, Tendsto (fun n => f n x) u (𝓝 (g x))) : AEMeasurable g μ 
goal: AEMeasurable g μ

full_name: aemeasurable_of_tendsto_metrizable_ae'
code: theorem aemeasurable_of_tendsto_metrizable_ae' {μ : Measure α} {f : ℕ → α → β} {g : α → β}
    (hf : ∀ n, AEMeasurable (f n) μ)
    (h_ae_tendsto : ∀ᵐ x ∂μ, Tendsto (fun n => f n x) atTop (𝓝 (g x))) : AEMeasurable g μ 
goal: AEMeasurable g μ

full_name: aemeasurable_of_unif_approx
code: theorem aemeasurable_of_unif_approx {β} [MeasurableSpace β] [PseudoMetricSpace β] [BorelSpace β]
    {μ : Measure α} {g : α → β}
    (hf : ∀ ε > (0 : ℝ), ∃ f : α → β, AEMeasurable f μ ∧ ∀ᵐ x ∂μ, dist (f x) (g x) ≤ ε) :
    AEMeasurable g μ 
goal: AEMeasurable g μ

full_name: measurable_of_tendsto_metrizable_ae
code: theorem measurable_of_tendsto_metrizable_ae {μ : Measure α} [μ.IsComplete] {f : ℕ → α → β}
    {g : α → β} (hf : ∀ n, Measurable (f n))
    (h_ae_tendsto : ∀ᵐ x ∂μ, Tendsto (fun n => f n x) atTop (𝓝 (g x))) : Measurable g 
goal: Measurable g

full_name: measurable_limit_of_tendsto_metrizable_ae
code: theorem measurable_limit_of_tendsto_metrizable_ae {ι} [Countable ι] [Nonempty ι] {μ : Measure α}
    {f : ι → α → β} {L : Filter ι} [L.IsCountablyGenerated] (hf : ∀ n, AEMeasurable (f n) μ)
    (h_ae_tendsto : ∀ᵐ x ∂μ, ∃ l : β, Tendsto (fun n => f n x) L (𝓝 l)) :
    ∃ f_lim : α → β, Measurable f_lim ∧ ∀ᵐ x ∂μ, Tendsto (fun n => f n x) L (𝓝 (f_lim x)) 
goal: ∃ f_lim, Measurable f_lim ∧ ∀ᵐ (x : α) ∂μ, Filter.Tendsto (fun n => f n x) L (𝓝 (f_lim x))

full_name: measurableSet_of_tendsto_indicator
code: /-- If the indicator functions of measurable sets `Aᵢ` converge to the indicator function of
a set `A` along a nontrivial countably generated filter, then `A` is also measurable. -/
lemma measurableSet_of_tendsto_indicator [NeBot L] (As_mble : ∀ i, MeasurableSet (As i))
    (h_lim : ∀ x, ∀ᶠ i in L, x ∈ As i ↔ x ∈ A) :
    MeasurableSet A 
goal: MeasurableSet A

full_name: nullMeasurableSet_of_tendsto_indicator
code: /-- If the indicator functions of a.e.-measurable sets `Aᵢ` converge a.e. to the indicator function
of a set `A` along a nontrivial countably generated filter, then `A` is also a.e.-measurable. -/
lemma nullMeasurableSet_of_tendsto_indicator [NeBot L] {μ : Measure α}
    (As_mble : ∀ i, NullMeasurableSet (As i) μ)
    (h_lim : ∀ᵐ x ∂μ, ∀ᶠ i in L, x ∈ As i ↔ x ∈ A) :
    NullMeasurableSet A μ 
goal: MeasureTheory.NullMeasurableSet A μ