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Mathlib.Algebra.Order.Group.Pointwise.Bounds

Upper/lower bounds in ordered monoids and groups #

In this file we prove a few facts like “-s is bounded above iff s is bounded below” (bddAbove_neg).

theorem mul_mem_upperBounds_mul {M : Type u_3} [Mul M] [Preorder M] [MulLeftMono M] [MulRightMono M] {s : Set M} {t : Set M} {a : M} {b : M} (ha : a ∈ upperBounds s) (hb : b ∈ upperBounds t) :

a * b ∈ upperBounds (s * t)

theorem add_mem_upperBounds_add {M : Type u_3} [Add M] [Preorder M] [AddLeftMono M] [AddRightMono M] {s : Set M} {t : Set M} {a : M} {b : M} (ha : a ∈ upperBounds s) (hb : b ∈ upperBounds t) :

a + b ∈ upperBounds (s + t)

theorem subset_upperBounds_mul {M : Type u_3} [Mul M] [Preorder M] [MulLeftMono M] [MulRightMono M] (s : Set M) (t : Set M) :

upperBounds s * upperBounds t ⊆ upperBounds (s * t)

theorem subset_upperBounds_add {M : Type u_3} [Add M] [Preorder M] [AddLeftMono M] [AddRightMono M] (s : Set M) (t : Set M) :

upperBounds s + upperBounds t ⊆ upperBounds (s + t)

theorem mul_mem_lowerBounds_mul {M : Type u_3} [Mul M] [Preorder M] [MulLeftMono M] [MulRightMono M] {s : Set M} {t : Set M} {a : M} {b : M} (ha : a ∈ lowerBounds s) (hb : b ∈ lowerBounds t) :

a * b ∈ lowerBounds (s * t)

theorem add_mem_lowerBounds_add {M : Type u_3} [Add M] [Preorder M] [AddLeftMono M] [AddRightMono M] {s : Set M} {t : Set M} {a : M} {b : M} (ha : a ∈ lowerBounds s) (hb : b ∈ lowerBounds t) :

a + b ∈ lowerBounds (s + t)

theorem subset_lowerBounds_mul {M : Type u_3} [Mul M] [Preorder M] [MulLeftMono M] [MulRightMono M] (s : Set M) (t : Set M) :

lowerBounds s * lowerBounds t ⊆ lowerBounds (s * t)

theorem subset_lowerBounds_add {M : Type u_3} [Add M] [Preorder M] [AddLeftMono M] [AddRightMono M] (s : Set M) (t : Set M) :

lowerBounds s + lowerBounds t ⊆ lowerBounds (s + t)

theorem BddAbove.mul {M : Type u_3} [Mul M] [Preorder M] [MulLeftMono M] [MulRightMono M] {s : Set M} {t : Set M} (hs : BddAbove s) (ht : BddAbove t) :

BddAbove (s * t)

theorem BddAbove.add {M : Type u_3} [Add M] [Preorder M] [AddLeftMono M] [AddRightMono M] {s : Set M} {t : Set M} (hs : BddAbove s) (ht : BddAbove t) :

BddAbove (s + t)

theorem BddBelow.mul {M : Type u_3} [Mul M] [Preorder M] [MulLeftMono M] [MulRightMono M] {s : Set M} {t : Set M} (hs : BddBelow s) (ht : BddBelow t) :

BddBelow (s * t)

theorem BddBelow.add {M : Type u_3} [Add M] [Preorder M] [AddLeftMono M] [AddRightMono M] {s : Set M} {t : Set M} (hs : BddBelow s) (ht : BddBelow t) :

BddBelow (s + t)

theorem BddAbove.range_mul {ι : Type u_1} {M : Type u_3} [Mul M] [Preorder M] [MulLeftMono M] [MulRightMono M] {f : ι → M} {g : ι → M} (hf : BddAbove (Set.range f)) (hg : BddAbove (Set.range g)) :

BddAbove (Set.range fun (i : ι) => f i * g i)

theorem BddAbove.range_add {ι : Type u_1} {M : Type u_3} [Add M] [Preorder M] [AddLeftMono M] [AddRightMono M] {f : ι → M} {g : ι → M} (hf : BddAbove (Set.range f)) (hg : BddAbove (Set.range g)) :

BddAbove (Set.range fun (i : ι) => f i + g i)

theorem BddBelow.range_mul {ι : Type u_1} {M : Type u_3} [Mul M] [Preorder M] [MulLeftMono M] [MulRightMono M] {f : ι → M} {g : ι → M} (hf : BddBelow (Set.range f)) (hg : BddBelow (Set.range g)) :

BddBelow (Set.range fun (i : ι) => f i * g i)

theorem BddBelow.range_add {ι : Type u_1} {M : Type u_3} [Add M] [Preorder M] [AddLeftMono M] [AddRightMono M] {f : ι → M} {g : ι → M} (hf : BddBelow (Set.range f)) (hg : BddBelow (Set.range g)) :

BddBelow (Set.range fun (i : ι) => f i + g i)

@[simp]

theorem bddAbove_inv {G : Type u_2} [Group G] [Preorder G] [MulLeftMono G] [MulRightMono G] {s : Set G} :

BddAbove s⁻¹ ↔ BddBelow s

@[simp]

theorem bddAbove_neg {G : Type u_2} [AddGroup G] [Preorder G] [AddLeftMono G] [AddRightMono G] {s : Set G} :

BddAbove (-s) ↔ BddBelow s

@[simp]

theorem bddBelow_inv {G : Type u_2} [Group G] [Preorder G] [MulLeftMono G] [MulRightMono G] {s : Set G} :

BddBelow s⁻¹ ↔ BddAbove s

@[simp]

theorem bddBelow_neg {G : Type u_2} [AddGroup G] [Preorder G] [AddLeftMono G] [AddRightMono G] {s : Set G} :

BddBelow (-s) ↔ BddAbove s

theorem BddAbove.inv {G : Type u_2} [Group G] [Preorder G] [MulLeftMono G] [MulRightMono G] {s : Set G} (h : BddAbove s) :

BddBelow s⁻¹

theorem BddAbove.neg {G : Type u_2} [AddGroup G] [Preorder G] [AddLeftMono G] [AddRightMono G] {s : Set G} (h : BddAbove s) :

theorem BddBelow.inv {G : Type u_2} [Group G] [Preorder G] [MulLeftMono G] [MulRightMono G] {s : Set G} (h : BddBelow s) :

BddAbove s⁻¹

theorem BddBelow.neg {G : Type u_2} [AddGroup G] [Preorder G] [AddLeftMono G] [AddRightMono G] {s : Set G} (h : BddBelow s) :

@[simp]

theorem isLUB_inv {G : Type u_2} [Group G] [Preorder G] [MulLeftMono G] [MulRightMono G] {s : Set G} {a : G} :

IsLUB s⁻¹ a ↔ IsGLB s a⁻¹

@[simp]

theorem isLUB_neg {G : Type u_2} [AddGroup G] [Preorder G] [AddLeftMono G] [AddRightMono G] {s : Set G} {a : G} :

IsLUB (-s) a ↔ IsGLB s (-a)

theorem isLUB_inv' {G : Type u_2} [Group G] [Preorder G] [MulLeftMono G] [MulRightMono G] {s : Set G} {a : G} :

IsLUB s⁻¹ a⁻¹ ↔ IsGLB s a

theorem isLUB_neg' {G : Type u_2} [AddGroup G] [Preorder G] [AddLeftMono G] [AddRightMono G] {s : Set G} {a : G} :

IsLUB (-s) (-a) ↔ IsGLB s a

theorem IsGLB.inv {G : Type u_2} [Group G] [Preorder G] [MulLeftMono G] [MulRightMono G] {s : Set G} {a : G} (h : IsGLB s a) :

IsLUB s⁻¹ a⁻¹

theorem IsGLB.neg {G : Type u_2} [AddGroup G] [Preorder G] [AddLeftMono G] [AddRightMono G] {s : Set G} {a : G} (h : IsGLB s a) :

IsLUB (-s) (-a)

@[simp]

theorem isGLB_inv {G : Type u_2} [Group G] [Preorder G] [MulLeftMono G] [MulRightMono G] {s : Set G} {a : G} :

IsGLB s⁻¹ a ↔ IsLUB s a⁻¹

@[simp]

theorem isGLB_neg {G : Type u_2} [AddGroup G] [Preorder G] [AddLeftMono G] [AddRightMono G] {s : Set G} {a : G} :

IsGLB (-s) a ↔ IsLUB s (-a)

theorem isGLB_inv' {G : Type u_2} [Group G] [Preorder G] [MulLeftMono G] [MulRightMono G] {s : Set G} {a : G} :

IsGLB s⁻¹ a⁻¹ ↔ IsLUB s a

theorem isGLB_neg' {G : Type u_2} [AddGroup G] [Preorder G] [AddLeftMono G] [AddRightMono G] {s : Set G} {a : G} :

IsGLB (-s) (-a) ↔ IsLUB s a

theorem IsLUB.inv {G : Type u_2} [Group G] [Preorder G] [MulLeftMono G] [MulRightMono G] {s : Set G} {a : G} (h : IsLUB s a) :

IsGLB s⁻¹ a⁻¹

theorem IsLUB.neg {G : Type u_2} [AddGroup G] [Preorder G] [AddLeftMono G] [AddRightMono G] {s : Set G} {a : G} (h : IsLUB s a) :

IsGLB (-s) (-a)

theorem BddBelow.range_inv {G : Type u_2} [Group G] [Preorder G] [MulLeftMono G] [MulRightMono G] {α : Type u_4} {f : α → G} (hf : BddBelow (Set.range f)) :

BddAbove (Set.range fun (x : α) => (f x)⁻¹)

theorem BddBelow.range_neg {G : Type u_2} [AddGroup G] [Preorder G] [AddLeftMono G] [AddRightMono G] {α : Type u_4} {f : α → G} (hf : BddBelow (Set.range f)) :

BddAbove (Set.range fun (x : α) => -f x)

theorem BddAbove.range_inv {G : Type u_2} [Group G] [Preorder G] [MulLeftMono G] [MulRightMono G] {α : Type u_4} {f : α → G} (hf : BddAbove (Set.range f)) :

BddBelow (Set.range fun (x : α) => (f x)⁻¹)

theorem BddAbove.range_neg {G : Type u_2} [AddGroup G] [Preorder G] [AddLeftMono G] [AddRightMono G] {α : Type u_4} {f : α → G} (hf : BddAbove (Set.range f)) :

BddBelow (Set.range fun (x : α) => -f x)