All proofs
Project-declaredLean 4.33.0-rc1 · mathlib@0434c033

Is Stable right Continuous

ProbabilityTheory.isStable_rightContinuous

Plain-language statement

The processes with right-continuous paths are a stable class.

Exact Lean statement

lemma isStable_rightContinuous :
    IsStable 𝓕 (fun (X : ι → Ω → E) ↦ ∀ ω, Function.IsRightContinuous (X · ω))

Formal artifact

Lean source

Canonical source
Full Lean sourceLean 4
lemma isStable_rightContinuous :    IsStable 𝓕 (fun (X : ι  Ω  E)   ω, Function.IsRightContinuous (X · ω)) := by  refine isStable_pathwise (fun X i  ContinuousWithinAt X (Set.Ioi i) i) (fun _  by fun_prop)    ?_ ?_  · intro X a hX i hai    specialize hX i    have h_eq : (fun x  X (min x a)) =ᶠ[𝓝[>] i] fun _  X a := by      rw [eventuallyEq_nhdsWithin_iff]      filter_upwards [] with j hji      rw [min_eq_right]      grind    refine (EventuallyEq.congr_continuousWithinAt h_eq ?_).mpr ?_    · simp [hai]    · fun_prop  · intro X Y i hXY    refine EventuallyEq.congr_continuousWithinAt ?_ ?_    · rw [eventuallyEq_nhdsWithin_iff]      obtain k, hik, hk := hXY      filter_upwards [eventually_lt_nhds hik] with j hjk _      exact hk j hjk    · obtain k, hik, hk := hXY      exact hk i hik
Project
Brownian motion
License
Apache-2.0
Commit
5077304f5e73
Source
BrownianMotion/StochasticIntegral/Locally.lean:174-195

Reuse this declaration

Bring the exact result into your workflow

The import identifies the source module. Your project still needs the pinned package dependency shown on this page.

What this badge means

This completion status comes from the project or community source. It has not yet been represented here as an independent rebuild and axiom audit.

Continue in this project

Related declarations

Project-declaredLean 4.33.0-rc1

Continuous Within At Iio indicator Ioc

continuousWithinAt_Iio_indicator_Ioc

Plain-language statement

The indicator of a half-open interval Ioc a b with constant value c is left-continuous: when approached from the left it is eventually constant, so it is continuous within Iio t at t for every t.

probabilitystochastic processesmeasure theory

Source project: Brownian motion

Person-level attribution pending.

View proof record
Project-declaredLean 4.33.0-rc1

Dense comap val nhds Within Ioi ne Bot

Dense.comap_val_nhdsWithin_Ioi_neBot

Project documentation

This is an auxillary lemma used to prove Dense.monotone_of_isRightContinuous. It is saying that if D is a dense set and a, b are two points such that a < b, then the comap of 𝓝[Set.Ioi a] a under the inclusion D → α is nontrivial. Note that a < b is necessary as this is clearly not true if a is a top element.

probabilitystochastic processesmeasure theory

Source project: Brownian motion

Person-level attribution pending.

View proof record