Documentation

Mathlib.Order.LatticeIntervals

Intervals in Lattices #

In this file, we provide instances of lattice structures on intervals within lattices. Some of them depend on the order of the endpoints of the interval, and thus are not made global instances. These are probably not all of the lattice instances that could be placed on these intervals, but more can be added easily along the same lines when needed.

Main definitions #

In the following, * can represent either c, o, or i.

Set.Ic*.orderBot
Set.Ii*.semillaticeInf
Set.I*c.orderTop
Set.I*c.semillaticeInf
Set.I**.lattice
Set.Iic.boundedOrder, within an OrderBot
Set.Ici.boundedOrder, within an OrderTop

instance Set.Ico.semilatticeInf {α : Type u_1} [SemilatticeInf α] {a : α} {b : α} :

SemilatticeInf ↑(Set.Ico a b)

Equations

Set.Ico.semilatticeInf = Subtype.semilatticeInf ⋯

@[reducible, inline]

abbrev Set.Ico.orderBot {α : Type u_1} [PartialOrder α] {a : α} {b : α} (h : a < b) :

OrderBot ↑(Set.Ico a b)

Ico a b has a bottom element whenever a < b.

Equations

Set.Ico.orderBot h = ⋯.orderBot

Instances For

instance Set.Iio.semilatticeInf {α : Type u_1} [SemilatticeInf α] {a : α} :

SemilatticeInf ↑(Set.Iio a)

Equations

Set.Iio.semilatticeInf = Subtype.semilatticeInf ⋯

instance Set.Ioc.semilatticeSup {α : Type u_1} [SemilatticeSup α] {a : α} {b : α} :

SemilatticeSup ↑(Set.Ioc a b)

Equations

Set.Ioc.semilatticeSup = Subtype.semilatticeSup ⋯

@[reducible, inline]

abbrev Set.Ioc.orderTop {α : Type u_1} [PartialOrder α] {a : α} {b : α} (h : a < b) :

OrderTop ↑(Set.Ioc a b)

Ioc a b has a top element whenever a < b.

Equations

Set.Ioc.orderTop h = ⋯.orderTop

Instances For

instance Set.Ioi.semilatticeSup {α : Type u_1} [SemilatticeSup α] {a : α} :

SemilatticeSup ↑(Set.Ioi a)

Equations

Set.Ioi.semilatticeSup = Subtype.semilatticeSup ⋯

instance Set.Iic.semilatticeInf {α : Type u_1} {a : α} [SemilatticeInf α] :

SemilatticeInf ↑(Set.Iic a)

Equations

Set.Iic.semilatticeInf = Subtype.semilatticeInf ⋯

@[simp]

theorem Set.Iic.coe_inf {α : Type u_1} {a : α} [SemilatticeInf α] {x : ↑(Set.Iic a)} {y : ↑(Set.Iic a)} :

↑(x ⊓ y) = ↑x ⊓ ↑y

instance Set.Iic.semilatticeSup {α : Type u_1} {a : α} [SemilatticeSup α] :

SemilatticeSup ↑(Set.Iic a)

Equations

Set.Iic.semilatticeSup = Subtype.semilatticeSup ⋯

@[simp]

theorem Set.Iic.coe_sup {α : Type u_1} {a : α} [SemilatticeSup α] {x : ↑(Set.Iic a)} {y : ↑(Set.Iic a)} :

↑(x ⊔ y) = ↑x ⊔ ↑y

instance Set.Iic.instLatticeElem {α : Type u_1} {a : α} [Lattice α] :

Lattice ↑(Set.Iic a)

Equations

Set.Iic.instLatticeElem = Lattice.mk SemilatticeInf.inf ⋯ ⋯ ⋯

instance Set.Iic.orderTop {α : Type u_1} {a : α} [Preorder α] :

OrderTop ↑(Set.Iic a)

Equations

Set.Iic.orderTop = OrderTop.mk ⋯

@[simp]

theorem Set.Iic.coe_top {α : Type u_1} {a : α} [Preorder α] :

↑⊤ = a

theorem Set.Iic.eq_top_iff {α : Type u_1} {a : α} [Preorder α] {x : ↑(Set.Iic a)} :

x = ⊤ ↔ ↑x = a

instance Set.Iic.orderBot {α : Type u_1} {a : α} [Preorder α] [OrderBot α] :

OrderBot ↑(Set.Iic a)

Equations

Set.Iic.orderBot = OrderBot.mk ⋯

@[simp]

theorem Set.Iic.coe_bot {α : Type u_1} {a : α} [Preorder α] [OrderBot α] :

instance Set.Iic.instBoundedOrderElemOfOrderBot {α : Type u_1} {a : α} [Preorder α] [OrderBot α] :

BoundedOrder ↑(Set.Iic a)

Equations

Set.Iic.instBoundedOrderElemOfOrderBot = BoundedOrder.mk

theorem Set.Iic.disjoint_iff {α : Type u_1} {a : α} [SemilatticeInf α] [OrderBot α] {x : ↑(Set.Iic a)} {y : ↑(Set.Iic a)} :

Disjoint x y ↔ Disjoint ↑x ↑y

theorem Set.Iic.codisjoint_iff {α : Type u_1} {a : α} [SemilatticeSup α] {x : ↑(Set.Iic a)} {y : ↑(Set.Iic a)} :

Codisjoint x y ↔ ↑x ⊔ ↑y = a

theorem Set.Iic.isCompl_iff {α : Type u_1} {a : α} [Lattice α] [BoundedOrder α] {x : ↑(Set.Iic a)} {y : ↑(Set.Iic a)} :

IsCompl x y ↔ Disjoint ↑x ↑y ∧ ↑x ⊔ ↑y = a

theorem Set.Iic.complementedLattice_iff {α : Type u_1} {a : α} [Lattice α] [BoundedOrder α] :

ComplementedLattice ↑(Set.Iic a) ↔ ∀ b ≤ a, ∃ c ≤ a, b ⊓ c = ⊥ ∧ b ⊔ c = a

instance Set.Ici.semilatticeInf {α : Type u_1} [SemilatticeInf α] {a : α} :

SemilatticeInf ↑(Set.Ici a)

Equations

Set.Ici.semilatticeInf = Subtype.semilatticeInf ⋯

instance Set.Ici.semilatticeSup {α : Type u_1} [SemilatticeSup α] {a : α} :

SemilatticeSup ↑(Set.Ici a)

Equations

Set.Ici.semilatticeSup = Subtype.semilatticeSup ⋯

instance Set.Ici.lattice {α : Type u_1} [Lattice α] {a : α} :

Lattice ↑(Set.Ici a)

Equations

Set.Ici.lattice = Lattice.mk SemilatticeInf.inf ⋯ ⋯ ⋯

instance Set.Ici.distribLattice {α : Type u_1} [DistribLattice α] {a : α} :

DistribLattice ↑(Set.Ici a)

Equations

Set.Ici.distribLattice = DistribLattice.mk ⋯

instance Set.Ici.orderBot {α : Type u_1} [Preorder α] {a : α} :

OrderBot ↑(Set.Ici a)

Equations

Set.Ici.orderBot = OrderBot.mk ⋯

@[simp]

theorem Set.Ici.coe_bot {α : Type u_1} [Preorder α] {a : α} :

↑⊥ = a

instance Set.Ici.orderTop {α : Type u_1} [Preorder α] [OrderTop α] {a : α} :

OrderTop ↑(Set.Ici a)

Equations

Set.Ici.orderTop = OrderTop.mk ⋯

@[simp]

theorem Set.Ici.coe_top {α : Type u_1} [Preorder α] [OrderTop α] {a : α} :

instance Set.Ici.boundedOrder {α : Type u_1} [Preorder α] [OrderTop α] {a : α} :

BoundedOrder ↑(Set.Ici a)

Equations

Set.Ici.boundedOrder = BoundedOrder.mk

instance Set.Icc.semilatticeInf {α : Type u_1} [SemilatticeInf α] {a : α} {b : α} :

SemilatticeInf ↑(Set.Icc a b)

Equations

Set.Icc.semilatticeInf = Subtype.semilatticeInf ⋯

instance Set.Icc.semilatticeSup {α : Type u_1} [SemilatticeSup α] {a : α} {b : α} :

SemilatticeSup ↑(Set.Icc a b)

Equations

Set.Icc.semilatticeSup = Subtype.semilatticeSup ⋯

instance Set.Icc.lattice {α : Type u_1} [Lattice α] {a : α} {b : α} :

Lattice ↑(Set.Icc a b)

Equations

Set.Icc.lattice = Lattice.mk SemilatticeInf.inf ⋯ ⋯ ⋯

@[reducible, inline]

abbrev Set.Icc.orderBot {α : Type u_1} [Preorder α] {a : α} {b : α} (h : a ≤ b) :

OrderBot ↑(Set.Icc a b)

Icc a b has a bottom element whenever a ≤ b.

Equations

Set.Icc.orderBot h = ⋯.orderBot

Instances For

@[reducible, inline]

abbrev Set.Icc.orderTop {α : Type u_1} [Preorder α] {a : α} {b : α} (h : a ≤ b) :

OrderTop ↑(Set.Icc a b)

Icc a b has a top element whenever a ≤ b.

Equations

Set.Icc.orderTop h = ⋯.orderTop

Instances For

@[reducible, inline]

abbrev Set.Icc.boundedOrder {α : Type u_1} [Preorder α] {a : α} {b : α} (h : a ≤ b) :

BoundedOrder ↑(Set.Icc a b)

Icc a b is a BoundedOrder whenever a ≤ b.

Equations

Set.Icc.boundedOrder h = BoundedOrder.mk

Instances For