Mathlib Map

Structures · Lean core

One

A type with a "one" element.

Defined in
Init.Prelude
Shape
One type argument · adds one

Extends0

Extends nothing: this is a root of the hierarchy.

Extended by5

Forgetful instances

Every One is also a

Provided automatically by

Concrete types that are instances100

  • Nat
  • Real
  • Bool
  • Quiver.Hom
  • Complex
  • SeparationQuotient
  • NNReal
  • ContinuousLinearMap
  • ENNReal
  • Polynomial
  • Filter.Germ
  • BoundedContinuousFunction
  • Padic
  • CStarMatrix
  • RatFunc
  • UniformSpace.Completion
  • TensorProduct
  • Unitization
  • WithConv
  • Matrix
  • WithVal
  • HahnSeries
  • NonemptyInterval
  • LocallyConstant
  • DomMulAct
  • QuadraticAlgebra
  • Units
  • MeasureTheory.SimpleFunc
  • FreeAbelianGroup
  • EReal
  • MonoidAlgebra
  • RestrictedProduct
  • TrivSqZeroExt
  • AddMonoidAlgebra
  • DirectLimit
  • DirectSum
  • UniformFun
  • DoubleCentralizer
  • Zsqrtd
  • UniformOnFun
  • ZNum
  • SymAlg
  • SkewMonoidAlgebra
  • Interval
  • CauSeq.Completion.Cauchy
  • ContMDiffMap
  • OreLocalization
  • PiTensorProduct
  • QuaternionAlgebra
  • WittVector
  • SetSemiring
  • PNat
  • CauSeq
  • TruncatedWittVector
  • LucasLehmer.X
  • CategoryTheory.End
  • Tropical
  • MvPowerSeries
  • Ordinal
  • FractionalIdeal
  • ArithmeticFunction
  • AdicCompletion
  • Matrix.SpecialLinearGroup
  • UpperSet
  • Module.End
  • LowerSet
  • Cardinal
  • MeasureTheory.AEEqFun
  • Representation.IntertwiningMap
  • Language
  • AdicCompletion.AdicCauchySequence
  • RingCon.Quotient
  • Num
  • HomogeneousLocalization
  • RingQuot
  • AddChar
  • AlgebraicGeometry.Scheme.IdealSheafData
  • Ring.DirectLimit
  • CentroidHom
  • Associates
  • Poly
  • SignType
  • FreeAlgebra
  • FreeGroup
  • AddMonoid.End
  • IncidenceAlgebra
  • Equiv.Perm
  • OneHom
  • ContinuousMonoidHom
  • ValuativeRel.ValueGroupWithZero
  • MulChar
  • ValuationRing.ValueGroup
  • PosNum
  • TangentSpace
  • SubMulAction
  • Part
  • ModularForm
  • SlashInvariantForm
  • MonoidWithZeroHom
  • RegularWreathProduct

How is a type an instance?

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Assumed by1,470

Ancestors4