[Merged by Bors] - chore: reverse gdelta/separation dependency #13694
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PR summary b24f7e4defImport changesDependency changes
Declarations diffNo declarations were harmed in the making of this PR! 🐙 You can run this locally as follows## summary with just the declaration names:
./scripts/no_lost_declarations.sh short <optional_commit>
## more verbose report:
./scripts/no_lost_declarations.sh <optional_commit> |
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This reversal will allow for the following definition for a [perfectly normal](https://topology.pi-base.org/properties/P15) space (with $T_1$ this is [T_6](https://topology.pi-base.org/properties/P000067), the last "whole number" separation axiom missing from mathlib), proposed at #13517. ```lean /-- A topological space `X` is a *perfectly normal space* provided it is normal and closed sets are Gδ. -/ class PerfectlyNormalSpace (X : Type u) [TopologicalSpace X] extends NormalSpace X : Prop where closed_gdelta : ∀ ⦃h : Set X⦄, IsClosed h → IsGδ h ```
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This reversal will allow for the following definition for a [perfectly normal](https://topology.pi-base.org/properties/P15) space (with $T_1$ this is [T_6](https://topology.pi-base.org/properties/P000067), the last "whole number" separation axiom missing from mathlib), proposed at #13517. ```lean /-- A topological space `X` is a *perfectly normal space* provided it is normal and closed sets are Gδ. -/ class PerfectlyNormalSpace (X : Type u) [TopologicalSpace X] extends NormalSpace X : Prop where closed_gdelta : ∀ ⦃h : Set X⦄, IsClosed h → IsGδ h ```
dagurtomas
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This reversal will allow for the following definition for a [perfectly normal](https://topology.pi-base.org/properties/P15) space (with $T_1$ this is [T_6](https://topology.pi-base.org/properties/P000067), the last "whole number" separation axiom missing from mathlib), proposed at #13517. ```lean /-- A topological space `X` is a *perfectly normal space* provided it is normal and closed sets are Gδ. -/ class PerfectlyNormalSpace (X : Type u) [TopologicalSpace X] extends NormalSpace X : Prop where closed_gdelta : ∀ ⦃h : Set X⦄, IsClosed h → IsGδ h ```
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This reversal will allow for the following definition for a perfectly normal space (with$T_1$ this is T_6, the last "whole number" separation axiom missing from mathlib), proposed at #13517.