Documentation Verification Report

Support

📁 Source: Mathlib/Analysis/Distribution/Support.lean

Statistics

MetricCount
DefinitionsIsVanishingOn, dsupport
2
Theoremsdisjoint_dsupport, iteratedLineDerivOp, lineDerivOp, mono, smulLeftCLM, compl_dsupport_eq_sUnion_isBounded, dsupport_compl_eq, dsupport_delta, dsupport_iteratedLineDerivOp_subset, dsupport_lineDerivOp_subset, dsupport_smulLeftCLM_subset, dsupport_subset_dsupport, isClosed_dsupport, mem_dsupport_iff, mem_dsupport_iff_forall_exists_ne, mem_dsupport_iff_frequently, mem_dsupport_iff_not_isVanishingOn, notMem_dsupport_iff, notMem_dsupport_iff_eventually, not_isVanishingOn_iff, not_isVanishingOn_mono, mem_dsupport, notMem_dsupport, isVanishingOn_delta
24
Total26

Distribution

Definitions

NameCategoryTheorems
IsVanishingOn 📖MathDef
15 mathmath: mem_dsupport_iff_not_isVanishingOn, Filter.HasBasis.notMem_dsupport, IsVanishingOn.smulLeftCLM, not_isVanishingOn_mono, mem_dsupport_iff_frequently, notMem_dsupport_iff_eventually, not_isVanishingOn_iff, IsVanishingOn.mono, Filter.HasBasis.mem_dsupport, IsVanishingOn.iteratedLineDerivOp, notMem_dsupport_iff, compl_dsupport_eq_sUnion_isBounded, dsupport_compl_eq, TemperedDistribution.isVanishingOn_delta, IsVanishingOn.lineDerivOp
dsupport 📖CompOp
17 mathmath: mem_dsupport_iff_not_isVanishingOn, dsupport_delta, Filter.HasBasis.notMem_dsupport, mem_dsupport_iff_frequently, notMem_dsupport_iff_eventually, Filter.HasBasis.mem_dsupport, notMem_dsupport_iff, dsupport_smulLeftCLM_subset, dsupport_iteratedLineDerivOp_subset, compl_dsupport_eq_sUnion_isBounded, dsupport_compl_eq, IsVanishingOn.disjoint_dsupport, dsupport_lineDerivOp_subset, isClosed_dsupport, dsupport_subset_dsupport, mem_dsupport_iff_forall_exists_ne, mem_dsupport_iff

Theorems

NameKindAssumesProvesValidatesDepends On
compl_dsupport_eq_sUnion_isBounded 📖mathematicalCompl.compl
Set
Set.instCompl
dsupport
UniformSpace.toTopologicalSpace
PseudoMetricSpace.toUniformSpace
Set.sUnion
setOf
IsVanishingOn
IsOpen
Bornology.IsBounded
PseudoMetricSpace.toBornology
Set.ext
dsupport_compl_eq 📖mathematicalCompl.compl
Set
Set.instCompl
dsupport
Set.sUnion
setOf
IsVanishingOn
IsOpen
Set.compl_sInter
Set.compl_image_set_of
compl_compl
dsupport_delta 📖mathematicaldsupport
Complex
SchwartzMap
Complex.instNormedAddCommGroup
InnerProductSpace.toNormedSpace
Real
Real.instRCLike
NormedAddCommGroup.toSeminormedAddCommGroup
instInnerProductSpaceRealComplex
SchwartzMap.instFunLike
UniformSpace.toTopologicalSpace
PseudoMetricSpace.toUniformSpace
SeminormedAddCommGroup.toPseudoMetricSpace
Complex.instZero
DFunLike.coe
TemperedDistribution
Complex.instRCLike
RCLike.innerProductSpace
UniformConvergenceCLM.instFunLike
Complex.instNormedField
RingHom.id
Semiring.toNonAssocSemiring
Complex.instSemiring
SchwartzMap.instAddCommGroup
SchwartzMap.instModule
SchwartzMap.instTopologicalSpace
NormedAddCommGroup.toAddCommGroup
NormedSpace.toModule
setOf
Set
Finite
Set.Elem
TemperedDistribution.delta
Set.instSingletonSet
subset_antisymm
Set.instAntisymmSubset
mem_dsupport_iff
TemperedDistribution.isVanishingOn_delta
T1Space.t1
T5Space.toT1Space
T6Space.toT5Space
instT6SpaceOfMetrizableSpace
EMetricSpace.metrizableSpace
mem_dsupport_iff_forall_exists_ne
exists_contDiff_tsupport_subset
IsOpen.mem_nhds_iff
HasSubset.Subset.trans
Set.instIsTransSubset
tsupport_comp_subset
HasCompactSupport.comp_left
ContDiff.comp
ContinuousLinearMap.contDiff
NeZero.charZero_one
Complex.instCharZero
dsupport_iteratedLineDerivOp_subset 📖mathematicalSet
Set.instHasSubset
dsupport
Complex
SchwartzMap
Complex.instNormedAddCommGroup
InnerProductSpace.toNormedSpace
Real
Real.instRCLike
NormedAddCommGroup.toSeminormedAddCommGroup
instInnerProductSpaceRealComplex
SchwartzMap.instFunLike
UniformSpace.toTopologicalSpace
PseudoMetricSpace.toUniformSpace
SeminormedAddCommGroup.toPseudoMetricSpace
Complex.instZero
NegZeroClass.toZero
SubNegZeroMonoid.toNegZeroClass
SubtractionMonoid.toSubNegZeroMonoid
SubtractionCommMonoid.toSubtractionMonoid
AddCommGroup.toDivisionAddCommMonoid
NormedAddCommGroup.toAddCommGroup
DFunLike.coe
TemperedDistribution
UniformConvergenceCLM.instFunLike
Complex.instNormedField
RingHom.id
Semiring.toNonAssocSemiring
Complex.instSemiring
SchwartzMap.instAddCommGroup
SchwartzMap.instModule
Complex.instRCLike
RCLike.innerProductSpace
SchwartzMap.instTopologicalSpace
NormedSpace.toModule
setOf
Finite
Set.Elem
LineDeriv.iteratedLineDerivOp
TemperedDistribution.instLineDeriv
dsupport_subset_dsupport
dsupport_lineDerivOp_subset 📖mathematicalSet
Set.instHasSubset
dsupport
Complex
SchwartzMap
Complex.instNormedAddCommGroup
InnerProductSpace.toNormedSpace
Real
Real.instRCLike
NormedAddCommGroup.toSeminormedAddCommGroup
instInnerProductSpaceRealComplex
SchwartzMap.instFunLike
UniformSpace.toTopologicalSpace
PseudoMetricSpace.toUniformSpace
SeminormedAddCommGroup.toPseudoMetricSpace
Complex.instZero
NegZeroClass.toZero
SubNegZeroMonoid.toNegZeroClass
SubtractionMonoid.toSubNegZeroMonoid
SubtractionCommMonoid.toSubtractionMonoid
AddCommGroup.toDivisionAddCommMonoid
NormedAddCommGroup.toAddCommGroup
DFunLike.coe
TemperedDistribution
UniformConvergenceCLM.instFunLike
Complex.instNormedField
RingHom.id
Semiring.toNonAssocSemiring
Complex.instSemiring
SchwartzMap.instAddCommGroup
SchwartzMap.instModule
Complex.instRCLike
RCLike.innerProductSpace
SchwartzMap.instTopologicalSpace
NormedSpace.toModule
setOf
Finite
Set.Elem
LineDeriv.lineDerivOp
TemperedDistribution.instLineDeriv
dsupport_subset_dsupport
dsupport_smulLeftCLM_subset 📖mathematicalFunction.HasTemperateGrowth
Complex
Complex.instNormedAddCommGroup
InnerProductSpace.toNormedSpace
Real
Real.instRCLike
NormedAddCommGroup.toSeminormedAddCommGroup
instInnerProductSpaceRealComplex
Set
Set.instHasSubset
dsupport
Complex
SchwartzMap
Complex.instNormedAddCommGroup
InnerProductSpace.toNormedSpace
Real
Real.instRCLike
NormedAddCommGroup.toSeminormedAddCommGroup
instInnerProductSpaceRealComplex
SchwartzMap.instFunLike
UniformSpace.toTopologicalSpace
PseudoMetricSpace.toUniformSpace
SeminormedAddCommGroup.toPseudoMetricSpace
Complex.instZero
NegZeroClass.toZero
SubNegZeroMonoid.toNegZeroClass
SubtractionMonoid.toSubNegZeroMonoid
SubtractionCommMonoid.toSubtractionMonoid
AddCommGroup.toDivisionAddCommMonoid
NormedAddCommGroup.toAddCommGroup
DFunLike.coe
TemperedDistribution
UniformConvergenceCLM.instFunLike
Complex.instNormedField
RingHom.id
Semiring.toNonAssocSemiring
Complex.instSemiring
SchwartzMap.instAddCommGroup
SchwartzMap.instModule
Complex.instRCLike
RCLike.innerProductSpace
SchwartzMap.instTopologicalSpace
NormedSpace.toModule
setOf
Finite
Set.Elem
ContinuousLinearMap
UniformConvergenceCLM.instTopologicalSpace
SeminormedAddCommGroup.toIsTopologicalAddGroup
AddCommGroup.toAddCommMonoid
UniformConvergenceCLM.instAddCommGroup
UniformConvergenceCLM.instModule
smulCommClass_self
CommRing.toCommMonoid
Complex.commRing
DistribMulAction.toMulAction
CommMonoid.toMonoid
AddCommMonoid.toAddMonoid
ESeminormedAddCommMonoid.toAddCommMonoid
ENormedAddCommMonoid.toESeminormedAddCommMonoid
NormedAddCommGroup.toENormedAddCommMonoid
Module.toDistribMulAction
Ring.toSemiring
CommRing.toRing
UniformContinuousConstSMul.to_continuousConstSMul
SMulZeroClass.toSMul
AddZero.toZero
AddZeroClass.toAddZero
AddMonoid.toAddZeroClass
SubNegMonoid.toAddMonoid
AddGroup.toSubNegMonoid
AddCommGroup.toAddGroup
DistribSMul.toSMulZeroClass
DistribMulAction.toDistribSMul
MonoidWithZero.toMonoid
Semiring.toMonoidWithZero
IsBoundedSMul.toUniformContinuousConstSMul
SeminormedRing.toPseudoMetricSpace
SeminormedCommRing.toSeminormedRing
NormedCommRing.toSeminormedCommRing
NormedField.toNormedCommRing
NormedSpace.toIsBoundedSMul
ContinuousLinearMap.funLike
TemperedDistribution.smulLeftCLM
dsupport_subset_dsupport
SeminormedAddCommGroup.toIsTopologicalAddGroup
smulCommClass_self
UniformContinuousConstSMul.to_continuousConstSMul
IsBoundedSMul.toUniformContinuousConstSMul
NormedSpace.toIsBoundedSMul
dsupport_subset_dsupport 📖mathematicalIsVanishingOnSet
Set.instHasSubset
dsupport
Set.sInter_mono
IsClosed.isOpen_compl
isClosed_dsupport 📖mathematicalIsClosed
dsupport
mem_dsupport_iff 📖mathematicalSet
Set.instMembership
dsupport
mem_dsupport_iff_forall_exists_ne 📖mathematicalSet
Set.instMembership
dsupport
Set.instHasSubset
tsupport
DFunLike.coe
mem_dsupport_iff_frequently 📖mathematicalSet
Set.instMembership
dsupport
Filter.Frequently
IsVanishingOn
Filter.smallSets
nhds
Filter.HasBasis.frequently_smallSets
nhds_basis_opens
not_isVanishingOn_mono
mem_dsupport_iff_not_isVanishingOn
mem_dsupport_iff_not_isVanishingOn 📖mathematicalSet
Set.instMembership
dsupport
IsVanishingOn
notMem_dsupport_iff 📖mathematicalSet
Set.instMembership
dsupport
IsVanishingOn
IsOpen
dsupport_compl_eq
notMem_dsupport_iff_eventually 📖mathematicalSet
Set.instMembership
dsupport
Filter.Eventually
IsVanishingOn
Filter.smallSets
nhds
not_isVanishingOn_iff 📖mathematicalIsVanishingOn
Set
Set.instHasSubset
tsupport
DFunLike.coe
not_isVanishingOn_mono 📖mathematicalSet
Set.instHasSubset
IsVanishingOn
IsVanishingOnIsVanishingOn.mono

Distribution.IsVanishingOn

Theorems

NameKindAssumesProvesValidatesDepends On
disjoint_dsupport 📖mathematicalDistribution.IsVanishingOn
IsOpen
Disjoint
Set
OmegaCompletePartialOrder.toPartialOrder
CompleteLattice.instOmegaCompletePartialOrder
CompleteBooleanAlgebra.toCompleteLattice
CompleteAtomicBooleanAlgebra.toCompleteBooleanAlgebra
Set.instCompleteAtomicBooleanAlgebra
HeytingAlgebra.toOrderBot
Order.Frame.toHeytingAlgebra
CompleteDistribLattice.toFrame
CompleteBooleanAlgebra.toCompleteDistribLattice
Distribution.dsupport
Set.subset_compl_iff_disjoint_right
Distribution.dsupport_compl_eq
Set.subset_sUnion_of_mem
iteratedLineDerivOp 📖mathematicalDistribution.IsVanishingOn
Complex
SchwartzMap
Complex.instNormedAddCommGroup
InnerProductSpace.toNormedSpace
Real
Real.instRCLike
NormedAddCommGroup.toSeminormedAddCommGroup
instInnerProductSpaceRealComplex
SchwartzMap.instFunLike
UniformSpace.toTopologicalSpace
PseudoMetricSpace.toUniformSpace
SeminormedAddCommGroup.toPseudoMetricSpace
Complex.instZero
NegZeroClass.toZero
SubNegZeroMonoid.toNegZeroClass
SubtractionMonoid.toSubNegZeroMonoid
SubtractionCommMonoid.toSubtractionMonoid
AddCommGroup.toDivisionAddCommMonoid
NormedAddCommGroup.toAddCommGroup
DFunLike.coe
TemperedDistribution
UniformConvergenceCLM.instFunLike
Complex.instNormedField
RingHom.id
Semiring.toNonAssocSemiring
Complex.instSemiring
SchwartzMap.instAddCommGroup
SchwartzMap.instModule
Complex.instRCLike
RCLike.innerProductSpace
SchwartzMap.instTopologicalSpace
NormedSpace.toModule
setOf
Set
Finite
Set.Elem
Distribution.IsVanishingOn
Complex
SchwartzMap
Complex.instNormedAddCommGroup
InnerProductSpace.toNormedSpace
Real
Real.instRCLike
NormedAddCommGroup.toSeminormedAddCommGroup
instInnerProductSpaceRealComplex
SchwartzMap.instFunLike
UniformSpace.toTopologicalSpace
PseudoMetricSpace.toUniformSpace
SeminormedAddCommGroup.toPseudoMetricSpace
Complex.instZero
NegZeroClass.toZero
SubNegZeroMonoid.toNegZeroClass
SubtractionMonoid.toSubNegZeroMonoid
SubtractionCommMonoid.toSubtractionMonoid
AddCommGroup.toDivisionAddCommMonoid
NormedAddCommGroup.toAddCommGroup
DFunLike.coe
TemperedDistribution
UniformConvergenceCLM.instFunLike
Complex.instNormedField
RingHom.id
Semiring.toNonAssocSemiring
Complex.instSemiring
SchwartzMap.instAddCommGroup
SchwartzMap.instModule
Complex.instRCLike
RCLike.innerProductSpace
SchwartzMap.instTopologicalSpace
NormedSpace.toModule
setOf
Set
Finite
Set.Elem
LineDeriv.iteratedLineDerivOp
TemperedDistribution.instLineDeriv
lineDerivOp
lineDerivOp 📖mathematicalDistribution.IsVanishingOn
Complex
SchwartzMap
Complex.instNormedAddCommGroup
InnerProductSpace.toNormedSpace
Real
Real.instRCLike
NormedAddCommGroup.toSeminormedAddCommGroup
instInnerProductSpaceRealComplex
SchwartzMap.instFunLike
UniformSpace.toTopologicalSpace
PseudoMetricSpace.toUniformSpace
SeminormedAddCommGroup.toPseudoMetricSpace
Complex.instZero
NegZeroClass.toZero
SubNegZeroMonoid.toNegZeroClass
SubtractionMonoid.toSubNegZeroMonoid
SubtractionCommMonoid.toSubtractionMonoid
AddCommGroup.toDivisionAddCommMonoid
NormedAddCommGroup.toAddCommGroup
DFunLike.coe
TemperedDistribution
UniformConvergenceCLM.instFunLike
Complex.instNormedField
RingHom.id
Semiring.toNonAssocSemiring
Complex.instSemiring
SchwartzMap.instAddCommGroup
SchwartzMap.instModule
Complex.instRCLike
RCLike.innerProductSpace
SchwartzMap.instTopologicalSpace
NormedSpace.toModule
setOf
Set
Finite
Set.Elem
Distribution.IsVanishingOn
Complex
SchwartzMap
Complex.instNormedAddCommGroup
InnerProductSpace.toNormedSpace
Real
Real.instRCLike
NormedAddCommGroup.toSeminormedAddCommGroup
instInnerProductSpaceRealComplex
SchwartzMap.instFunLike
UniformSpace.toTopologicalSpace
PseudoMetricSpace.toUniformSpace
SeminormedAddCommGroup.toPseudoMetricSpace
Complex.instZero
NegZeroClass.toZero
SubNegZeroMonoid.toNegZeroClass
SubtractionMonoid.toSubNegZeroMonoid
SubtractionCommMonoid.toSubtractionMonoid
AddCommGroup.toDivisionAddCommMonoid
NormedAddCommGroup.toAddCommGroup
DFunLike.coe
TemperedDistribution
UniformConvergenceCLM.instFunLike
Complex.instNormedField
RingHom.id
Semiring.toNonAssocSemiring
Complex.instSemiring
SchwartzMap.instAddCommGroup
SchwartzMap.instModule
Complex.instRCLike
RCLike.innerProductSpace
SchwartzMap.instTopologicalSpace
NormedSpace.toModule
setOf
Set
Finite
Set.Elem
LineDeriv.lineDerivOp
TemperedDistribution.instLineDeriv
map_neg
DistribMulActionSemiHomClass.toAddMonoidHomClass
SemilinearMapClass.distribMulActionSemiHomClass
ContinuousSemilinearMapClass.toSemilinearMapClass
UniformConvergenceCLM.instContinuousSemilinearMapClass
HasSubset.Subset.trans
Set.instIsTransSubset
tsupport_fderiv_apply_subset
mono 📖mathematicalSet
Set.instHasSubset
Distribution.IsVanishingOn
Distribution.IsVanishingOnHasSubset.Subset.trans
Set.instIsTransSubset
smulLeftCLM 📖mathematicalDistribution.IsVanishingOn
Complex
SchwartzMap
Complex.instNormedAddCommGroup
InnerProductSpace.toNormedSpace
Real
Real.instRCLike
NormedAddCommGroup.toSeminormedAddCommGroup
instInnerProductSpaceRealComplex
SchwartzMap.instFunLike
UniformSpace.toTopologicalSpace
PseudoMetricSpace.toUniformSpace
SeminormedAddCommGroup.toPseudoMetricSpace
Complex.instZero
NegZeroClass.toZero
SubNegZeroMonoid.toNegZeroClass
SubtractionMonoid.toSubNegZeroMonoid
SubtractionCommMonoid.toSubtractionMonoid
AddCommGroup.toDivisionAddCommMonoid
NormedAddCommGroup.toAddCommGroup
DFunLike.coe
TemperedDistribution
UniformConvergenceCLM.instFunLike
Complex.instNormedField
RingHom.id
Semiring.toNonAssocSemiring
Complex.instSemiring
SchwartzMap.instAddCommGroup
SchwartzMap.instModule
Complex.instRCLike
RCLike.innerProductSpace
SchwartzMap.instTopologicalSpace
NormedSpace.toModule
setOf
Set
Finite
Set.Elem
Function.HasTemperateGrowth
Distribution.IsVanishingOn
Complex
SchwartzMap
Complex.instNormedAddCommGroup
InnerProductSpace.toNormedSpace
Real
Real.instRCLike
NormedAddCommGroup.toSeminormedAddCommGroup
instInnerProductSpaceRealComplex
SchwartzMap.instFunLike
UniformSpace.toTopologicalSpace
PseudoMetricSpace.toUniformSpace
SeminormedAddCommGroup.toPseudoMetricSpace
Complex.instZero
NegZeroClass.toZero
SubNegZeroMonoid.toNegZeroClass
SubtractionMonoid.toSubNegZeroMonoid
SubtractionCommMonoid.toSubtractionMonoid
AddCommGroup.toDivisionAddCommMonoid
NormedAddCommGroup.toAddCommGroup
DFunLike.coe
TemperedDistribution
UniformConvergenceCLM.instFunLike
Complex.instNormedField
RingHom.id
Semiring.toNonAssocSemiring
Complex.instSemiring
SchwartzMap.instAddCommGroup
SchwartzMap.instModule
Complex.instRCLike
RCLike.innerProductSpace
SchwartzMap.instTopologicalSpace
NormedSpace.toModule
setOf
Set
Finite
Set.Elem
ContinuousLinearMap
UniformConvergenceCLM.instTopologicalSpace
SeminormedAddCommGroup.toIsTopologicalAddGroup
AddCommGroup.toAddCommMonoid
UniformConvergenceCLM.instAddCommGroup
UniformConvergenceCLM.instModule
smulCommClass_self
CommRing.toCommMonoid
Complex.commRing
DistribMulAction.toMulAction
CommMonoid.toMonoid
AddCommMonoid.toAddMonoid
ESeminormedAddCommMonoid.toAddCommMonoid
ENormedAddCommMonoid.toESeminormedAddCommMonoid
NormedAddCommGroup.toENormedAddCommMonoid
Module.toDistribMulAction
Ring.toSemiring
CommRing.toRing
UniformContinuousConstSMul.to_continuousConstSMul
SMulZeroClass.toSMul
AddZero.toZero
AddZeroClass.toAddZero
AddMonoid.toAddZeroClass
SubNegMonoid.toAddMonoid
AddGroup.toSubNegMonoid
AddCommGroup.toAddGroup
DistribSMul.toSMulZeroClass
DistribMulAction.toDistribSMul
MonoidWithZero.toMonoid
Semiring.toMonoidWithZero
IsBoundedSMul.toUniformContinuousConstSMul
SeminormedRing.toPseudoMetricSpace
SeminormedCommRing.toSeminormedRing
NormedCommRing.toSeminormedCommRing
NormedField.toNormedCommRing
NormedSpace.toIsBoundedSMul
ContinuousLinearMap.funLike
TemperedDistribution.smulLeftCLM
IsScalarTower.to_smulCommClass
Real.isScalarTower
IsBoundedSMul.continuousSMul
NormedSpace.toIsBoundedSMul
TopologicalSpace.t2Space_of_metrizableSpace
EMetricSpace.metrizableSpace
SchwartzMap.smulLeftCLM_apply
HasSubset.Subset.trans
Set.instIsTransSubset
tsupport_smul_subset_right

Filter.HasBasis

Theorems

NameKindAssumesProvesValidatesDepends On
mem_dsupport 📖mathematicalFilter.HasBasis
nhds
Set
Set.instMembership
Distribution.dsupport
Distribution.IsVanishingOn
Distribution.mem_dsupport_iff_frequently
frequently_smallSets
Distribution.not_isVanishingOn_mono
notMem_dsupport 📖mathematicalFilter.HasBasis
nhds
Set
Set.instMembership
Distribution.dsupport
Distribution.IsVanishingOn
mem_dsupport

TemperedDistribution

Theorems

NameKindAssumesProvesValidatesDepends On
isVanishingOn_delta 📖mathematicalDistribution.IsVanishingOn
Complex
SchwartzMap
Complex.instNormedAddCommGroup
InnerProductSpace.toNormedSpace
Real
Real.instRCLike
NormedAddCommGroup.toSeminormedAddCommGroup
instInnerProductSpaceRealComplex
SchwartzMap.instFunLike
UniformSpace.toTopologicalSpace
PseudoMetricSpace.toUniformSpace
SeminormedAddCommGroup.toPseudoMetricSpace
Complex.instZero
DFunLike.coe
TemperedDistribution
Complex.instRCLike
RCLike.innerProductSpace
UniformConvergenceCLM.instFunLike
Complex.instNormedField
RingHom.id
Semiring.toNonAssocSemiring
Complex.instSemiring
SchwartzMap.instAddCommGroup
SchwartzMap.instModule
SchwartzMap.instTopologicalSpace
NormedAddCommGroup.toAddCommGroup
NormedSpace.toModule
setOf
Set
Finite
Set.Elem
delta
Compl.compl
Set.instCompl
Set.instSingletonSet
image_eq_zero_of_notMem_tsupport
Set.subset_compl_singleton_iff

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