Theorem: Profinite.NobelingProof.GoodProducts.maxToGood_injective
File: Mathlib/Topology/Category/Profinite/Nobeling.lean

tactic: intro m n h
state_before: I : Type u
inst✝¹ : LinearOrder I
inst✝ : IsWellOrder I fun x x_1 => x < x_1
C : Set (I → Bool)
o : Ordinal.{u}
hC : IsClosed C
hsC : contained C (Order.succ o)
ho : o < Ordinal.type fun x x_1 => x < x_1
h₁ : ⊤ ≤ Submodule.span ℤ (Set.range (eval (π C fun x => ord I x < o)))
⊢ Function.Injective (MaxToGood C hC hsC ho h₁)
state_after: I : Type u
inst✝¹ : LinearOrder I
inst✝ : IsWellOrder I fun x x_1 => x < x_1
C : Set (I → Bool)
o : Ordinal.{u}
hC : IsClosed C
hsC : contained C (Order.succ o)
ho : o < Ordinal.type fun x x_1 => x < x_1
h₁ : ⊤ ≤ Submodule.span ℤ (Set.range (eval (π C fun x => ord I x < o)))
m n : ↑(MaxProducts C ho)
h : MaxToGood C hC hsC ho h₁ m = MaxToGood C hC hsC ho h₁ n
⊢ m = n

tactic: apply Subtype.ext ∘ Subtype.ext
state_before: I : Type u
inst✝¹ : LinearOrder I
inst✝ : IsWellOrder I fun x x_1 => x < x_1
C : Set (I → Bool)
o : Ordinal.{u}
hC : IsClosed C
hsC : contained C (Order.succ o)
ho : o < Ordinal.type fun x x_1 => x < x_1
h₁ : ⊤ ≤ Submodule.span ℤ (Set.range (eval (π C fun x => ord I x < o)))
m n : ↑(MaxProducts C ho)
h : MaxToGood C hC hsC ho h₁ m = MaxToGood C hC hsC ho h₁ n
⊢ m = n
state_after: I : Type u
inst✝¹ : LinearOrder I
inst✝ : IsWellOrder I fun x x_1 => x < x_1
C : Set (I → Bool)
o : Ordinal.{u}
hC : IsClosed C
hsC : contained C (Order.succ o)
ho : o < Ordinal.type fun x x_1 => x < x_1
h₁ : ⊤ ≤ Submodule.span ℤ (Set.range (eval (π C fun x => ord I x < o)))
m n : ↑(MaxProducts C ho)
h : MaxToGood C hC hsC ho h₁ m = MaxToGood C hC hsC ho h₁ n
⊢ ↑↑m = ↑↑n

tactic: rw [Subtype.ext_iff] at h
state_before: I : Type u
inst✝¹ : LinearOrder I
inst✝ : IsWellOrder I fun x x_1 => x < x_1
C : Set (I → Bool)
o : Ordinal.{u}
hC : IsClosed C
hsC : contained C (Order.succ o)
ho : o < Ordinal.type fun x x_1 => x < x_1
h₁ : ⊤ ≤ Submodule.span ℤ (Set.range (eval (π C fun x => ord I x < o)))
m n : ↑(MaxProducts C ho)
h : MaxToGood C hC hsC ho h₁ m = MaxToGood C hC hsC ho h₁ n
⊢ ↑↑m = ↑↑n
state_after: I : Type u
inst✝¹ : LinearOrder I
inst✝ : IsWellOrder I fun x x_1 => x < x_1
C : Set (I → Bool)
o : Ordinal.{u}
hC : IsClosed C
hsC : contained C (Order.succ o)
ho : o < Ordinal.type fun x x_1 => x < x_1
h₁ : ⊤ ≤ Submodule.span ℤ (Set.range (eval (π C fun x => ord I x < o)))
m n : ↑(MaxProducts C ho)
h : ↑(MaxToGood C hC hsC ho h₁ m) = ↑(MaxToGood C hC hsC ho h₁ n)
⊢ ↑↑m = ↑↑n

tactic: dsimp [MaxToGood] at h
state_before: I : Type u
inst✝¹ : LinearOrder I
inst✝ : IsWellOrder I fun x x_1 => x < x_1
C : Set (I → Bool)
o : Ordinal.{u}
hC : IsClosed C
hsC : contained C (Order.succ o)
ho : o < Ordinal.type fun x x_1 => x < x_1
h₁ : ⊤ ≤ Submodule.span ℤ (Set.range (eval (π C fun x => ord I x < o)))
m n : ↑(MaxProducts C ho)
h : ↑(MaxToGood C hC hsC ho h₁ m) = ↑(MaxToGood C hC hsC ho h₁ n)
⊢ ↑↑m = ↑↑n
state_after: I : Type u
inst✝¹ : LinearOrder I
inst✝ : IsWellOrder I fun x x_1 => x < x_1
C : Set (I → Bool)
o : Ordinal.{u}
hC : IsClosed C
hsC : contained C (Order.succ o)
ho : o < Ordinal.type fun x x_1 => x < x_1
h₁ : ⊤ ≤ Submodule.span ℤ (Set.range (eval (π C fun x => ord I x < o)))
m n : ↑(MaxProducts C ho)
h : (↑m).Tail = (↑n).Tail
⊢ ↑↑m = ↑↑n

tactic: rw [max_eq_o_cons_tail C hsC ho m, max_eq_o_cons_tail C hsC ho n, h]
state_before: I : Type u
inst✝¹ : LinearOrder I
inst✝ : IsWellOrder I fun x x_1 => x < x_1
C : Set (I → Bool)
o : Ordinal.{u}
hC : IsClosed C
hsC : contained C (Order.succ o)
ho : o < Ordinal.type fun x x_1 => x < x_1
h₁ : ⊤ ≤ Submodule.span ℤ (Set.range (eval (π C fun x => ord I x < o)))
m n : ↑(MaxProducts C ho)
h : (↑m).Tail = (↑n).Tail
⊢ ↑↑m = ↑↑n
state_after: no goals