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Mathlib.Topology.Algebra.Star

Continuity of `star` #

This file defines the ContinuousStar typeclass, along with instances on Pi, Prod, MulOpposite, and Units.

class ContinuousStar (R : Type u_1) [TopologicalSpace R] [Star R] :

Basic hypothesis to talk about a topological space with a continuous star operator.

continuous_star : Continuous star
The star operator is continuous.

Instances

theorem continuousOn_star {R : Type u_2} [TopologicalSpace R] [Star R] [ContinuousStar R] {s : Set R} :

ContinuousOn star s

theorem continuousWithinAt_star {R : Type u_2} [TopologicalSpace R] [Star R] [ContinuousStar R] {s : Set R} {x : R} :

ContinuousWithinAt star s x

theorem continuousAt_star {R : Type u_2} [TopologicalSpace R] [Star R] [ContinuousStar R] {x : R} :

ContinuousAt star x

theorem tendsto_star {R : Type u_2} [TopologicalSpace R] [Star R] [ContinuousStar R] (a : R) :

Filter.Tendsto star (nhds a) (nhds (star a))

theorem Filter.Tendsto.star {α : Type u_1} {R : Type u_2} [TopologicalSpace R] [Star R] [ContinuousStar R] {f : α → R} {l : Filter α} {y : R} (h : Filter.Tendsto f l (nhds y)) :

Filter.Tendsto (fun (x : α) => star (f x)) l (nhds (star y))

theorem Continuous.star {α : Type u_1} {R : Type u_2} [TopologicalSpace R] [Star R] [ContinuousStar R] [TopologicalSpace α] {f : α → R} (hf : Continuous f) :

Continuous fun (x : α) => star (f x)

theorem ContinuousAt.star {α : Type u_1} {R : Type u_2} [TopologicalSpace R] [Star R] [ContinuousStar R] [TopologicalSpace α] {f : α → R} {x : α} (hf : ContinuousAt f x) :

ContinuousAt (fun (x : α) => star (f x)) x

theorem ContinuousOn.star {α : Type u_1} {R : Type u_2} [TopologicalSpace R] [Star R] [ContinuousStar R] [TopologicalSpace α] {f : α → R} {s : Set α} (hf : ContinuousOn f s) :

ContinuousOn (fun (x : α) => star (f x)) s

theorem ContinuousWithinAt.star {α : Type u_1} {R : Type u_2} [TopologicalSpace R] [Star R] [ContinuousStar R] [TopologicalSpace α] {f : α → R} {s : Set α} {x : α} (hf : ContinuousWithinAt f s x) :

ContinuousWithinAt (fun (x : α) => star (f x)) s x

@[simp]

theorem starContinuousMap_apply {R : Type u_2} [TopologicalSpace R] [Star R] [ContinuousStar R] :

∀ (a : R), starContinuousMap a = star a

def starContinuousMap {R : Type u_2} [TopologicalSpace R] [Star R] [ContinuousStar R] :

The star operation bundled as a continuous map.

Equations

starContinuousMap = ContinuousMap.mk star

Instances For

instance instContinuousStarProdInstTopologicalSpaceProdInstStarProd {R : Type u_1} {S : Type u_2} [Star R] [Star S] [TopologicalSpace R] [TopologicalSpace S] [ContinuousStar R] [ContinuousStar S] :

ContinuousStar (R × S)

Equations

(_ : ContinuousStar (R × S)) = (_ : ContinuousStar (R × S))

instance instContinuousStarForAllTopologicalSpaceInstStarForAll {ι : Type u_3} {C : ι → Type u_4} [(i : ι) → TopologicalSpace (C i)] [(i : ι) → Star (C i)] [∀ (i : ι), ContinuousStar (C i)] :

ContinuousStar ((i : ι) → C i)

Equations

(_ : ContinuousStar ((i : ι) → C i)) = (_ : ContinuousStar ((i : ι) → C i))

instance instContinuousStarMulOppositeInstTopologicalSpaceMulOppositeInstStarMulOpposite {R : Type u_1} [Star R] [TopologicalSpace R] [ContinuousStar R] :

ContinuousStar Rᵐᵒᵖ

Equations

(_ : ContinuousStar Rᵐᵒᵖ) = (_ : ContinuousStar Rᵐᵒᵖ)

instance instContinuousStarUnitsInstTopologicalSpaceUnitsToStarToInvolutiveStarToMulInstMulOneClassInstStarMulUnitsToMulInstMulOneClass {R : Type u_1} [Monoid R] [StarMul R] [TopologicalSpace R] [ContinuousStar R] :

ContinuousStar Rˣ

Equations

(_ : ContinuousStar Rˣ) = (_ : ContinuousStar Rˣ)