Mathlib Map

Structures · Logic and sets

IsEmpty

IsEmpty α expresses that α is empty.

Defined in
Mathlib.Logic.IsEmpty.Defs
Shape
One type argument · adds false

Extends0

Extends nothing: this is a root of the hierarchy.

Extended by0

Nothing extends this class yet.

Forgetful instances

Concrete types that are instances45

  • Quiver.Hom
  • TopCat.carrier
  • NonemptyInterval
  • CategoryTheory.Discrete
  • SymAlg
  • TopologicalSpace.NonemptyCompacts
  • CategoryTheory.PreZeroHypercover.I₀
  • Empty
  • FundamentalGroupoid
  • PEmpty
  • PrimeSpectrum
  • Ordinal.ToType
  • Sym2
  • PrincipalSeg
  • LieModule.Weight
  • SingularManifold.M
  • Sym
  • PProd
  • Projectivization
  • RelSeries
  • SimpleGraph.ConnectedComponent
  • False
  • Function.Embedding
  • PSum
  • WType
  • Multiset.ToType
  • FirstOrder.Language.Relations
  • FirstOrder.Language.Symbols
  • SuccOrder
  • PredOrder
  • PSet.Type
  • FirstOrder.Language.Functions
  • SimpleGraph.Hom
  • Subtype
  • Prod
  • Set.Elem
  • ULift
  • MulOpposite
  • Fin
  • AddOpposite
  • Sum
  • Sigma
  • Quotient
  • PLift
  • Quot

How is a type an instance?

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Assumed by442

Ancestors59