Documentation

Std.Data.HashSet.RawLemmas

Hash set lemmas #

This module contains lemmas about Std.Data.HashSet.Raw. Most of the lemmas require EquivBEq α and LawfulHashable α for the key type α. The easiest way to obtain these instances is to provide an instance of LawfulBEq α.

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@[simp]
theorem Std.HashSet.Raw.size_empty {α : Type u} {c : Nat} :
(Std.HashSet.Raw.empty c).size = 0
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@[simp]
theorem Std.HashSet.Raw.size_emptyc {α : Type u} :
∅.size = 0
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theorem Std.HashSet.Raw.isEmpty_eq_size_eq_zero {α : Type u} {m : Std.HashSet.Raw α} :
m.isEmpty = (m.size == 0)
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@[simp]
theorem Std.HashSet.Raw.isEmpty_empty {α : Type u} [BEq α] [Hashable α] {c : Nat} :
(Std.HashSet.Raw.empty c).isEmpty = true
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@[simp]
theorem Std.HashSet.Raw.isEmpty_emptyc {α : Type u} [BEq α] [Hashable α] :
∅.isEmpty = true
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@[simp]
theorem Std.HashSet.Raw.isEmpty_insert {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {a : α} :
(m.insert a).isEmpty = false
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theorem Std.HashSet.Raw.mem_iff_contains {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] {a : α} :
a ∈ m ↔ m.contains a = true
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theorem Std.HashSet.Raw.contains_congr {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {a : α} {b : α} (hab : (a == b) = true) :
m.contains a = m.contains b
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theorem Std.HashSet.Raw.mem_congr {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {a : α} {b : α} (hab : (a == b) = true) :
a ∈ m ↔ b ∈ m
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@[simp]
theorem Std.HashSet.Raw.contains_empty {α : Type u} [BEq α] [Hashable α] {a : α} {c : Nat} :
(Std.HashSet.Raw.empty c).contains a = false
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@[simp]
theorem Std.HashSet.Raw.not_mem_empty {α : Type u} [BEq α] [Hashable α] {a : α} {c : Nat} :
¬a ∈ Std.HashSet.Raw.empty c
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@[simp]
theorem Std.HashSet.Raw.contains_emptyc {α : Type u} [BEq α] [Hashable α] {a : α} :
∅.contains a = false
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@[simp]
theorem Std.HashSet.Raw.not_mem_emptyc {α : Type u} [BEq α] [Hashable α] {a : α} :
¬a ∈ ∅
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theorem Std.HashSet.Raw.contains_of_isEmpty {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {a : α} :
m.isEmpty = true → m.contains a = false
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theorem Std.HashSet.Raw.not_mem_of_isEmpty {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {a : α} :
m.isEmpty = true → ¬a ∈ m
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theorem Std.HashSet.Raw.isEmpty_eq_false_iff_exists_contains_eq_true {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) :
m.isEmpty = false ↔ ∃ (a : α), m.contains a = true
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theorem Std.HashSet.Raw.isEmpty_eq_false_iff_exists_mem {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) :
m.isEmpty = false ↔ ∃ (a : α), a ∈ m
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theorem Std.HashSet.Raw.isEmpty_iff_forall_contains {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) :
m.isEmpty = true ↔ ∀ (a : α), m.contains a = false
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theorem Std.HashSet.Raw.isEmpty_iff_forall_not_mem {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) :
m.isEmpty = true ↔ ∀ (a : α), ¬a ∈ m
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@[simp]
theorem Std.HashSet.Raw.contains_insert {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {k : α} {a : α} :
(m.insert k).contains a = (k == a || m.contains a)
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@[simp]
theorem Std.HashSet.Raw.mem_insert {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {k : α} {a : α} :
a ∈ m.insert k ↔ (k == a) = true ∨ a ∈ m
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theorem Std.HashSet.Raw.contains_of_contains_insert {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {k : α} {a : α} :
(m.insert k).contains a = true → (k == a) = false → m.contains a = true
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theorem Std.HashSet.Raw.mem_of_mem_insert {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {k : α} {a : α} :
a ∈ m.insert k → (k == a) = false → a ∈ m
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@[simp]
theorem Std.HashSet.Raw.contains_insert_self {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {k : α} :
(m.insert k).contains k = true
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@[simp]
theorem Std.HashSet.Raw.mem_insert_self {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {k : α} :
k ∈ m.insert k
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theorem Std.HashSet.Raw.size_insert {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {k : α} :
(m.insert k).size = if k ∈ m then m.size else m.size + 1
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theorem Std.HashSet.Raw.size_le_size_insert {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {k : α} :
m.size ≤ (m.insert k).size
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theorem Std.HashSet.Raw.size_insert_le {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {k : α} :
(m.insert k).size ≤ m.size + 1
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@[simp]
theorem Std.HashSet.Raw.erase_empty {α : Type u} [BEq α] [Hashable α] {k : α} {c : Nat} :
(Std.HashSet.Raw.empty c).erase k = Std.HashSet.Raw.empty c
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@[simp]
theorem Std.HashSet.Raw.erase_emptyc {α : Type u} [BEq α] [Hashable α] {k : α} :
∅.erase k = ∅
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@[simp]
theorem Std.HashSet.Raw.isEmpty_erase {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {k : α} :
(m.erase k).isEmpty = (m.isEmpty || m.size == 1 && m.contains k)
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@[simp]
theorem Std.HashSet.Raw.contains_erase {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {k : α} {a : α} :
(m.erase k).contains a = (!k == a && m.contains a)
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@[simp]
theorem Std.HashSet.Raw.mem_erase {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {k : α} {a : α} :
a ∈ m.erase k ↔ (k == a) = false ∧ a ∈ m
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theorem Std.HashSet.Raw.contains_of_contains_erase {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {k : α} {a : α} :
(m.erase k).contains a = true → m.contains a = true
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theorem Std.HashSet.Raw.mem_of_mem_erase {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {k : α} {a : α} :
a ∈ m.erase k → a ∈ m
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theorem Std.HashSet.Raw.size_erase {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {k : α} :
(m.erase k).size = if k ∈ m then m.size - 1 else m.size
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theorem Std.HashSet.Raw.size_erase_le {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {k : α} :
(m.erase k).size ≤ m.size
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theorem Std.HashSet.Raw.size_le_size_erase {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] [EquivBEq α] [LawfulHashable α] (h : m.WF) {k : α} :
m.size ≤ (m.erase k).size + 1
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@[simp]
theorem Std.HashSet.Raw.containsThenInsert_fst {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] (h : m.WF) {k : α} :
(m.containsThenInsert k).fst = m.contains k
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@[simp]
theorem Std.HashSet.Raw.containsThenInsert_snd {α : Type u} {m : Std.HashSet.Raw α} [BEq α] [Hashable α] (h : m.WF) {k : α} :
(m.containsThenInsert k).snd = m.insert k