l3lab/ntp-mathlib huggingface dataset:
theorem Associated.prod {M : Type*} [CommMonoid M] {ι : Type*} (s : Finset ι) (f : ι → M)
    (g : ι → M) (h : ∀ i, i ∈ s → (f i) ~ᵤ (g i)) : (∏ i in s, f i) ~ᵤ (∏ i in s, g i) := by
  

Proof state:
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
M : Type u_5
inst✝ : CommMonoid M
ι : Type u_6
s : Finset ι
f g : ι → M
h : ∀ i ∈ s, f i ~ᵤ g i
⊢ ∏ i in s, f i ~ᵤ ∏ i in s, g i

Next tactic:
induction s using Finset.induction with
  | empty =>
    simp only [Finset.prod_empty]
    rfl
  | @insert j s hjs IH =>
    classical
    convert_to (∏ i in insert j s, f i) ~ᵤ (∏ i in insert j s, g i)
    rw [Finset.prod_insert hjs, Finset.prod_insert hjs]
    exact Associated.mul_mul (h j (Finset.mem_insert_self j s))
      (IH (fun i hi ↦ h i (Finset.mem_insert_of_mem hi)))
theorem Associated.prod {M : Type*} [CommMonoid M] {ι : Type*} (s : Finset ι) (f : ι → M)
    (g : ι → M) (h : ∀ i, i ∈ s → (f i) ~ᵤ (g i)) : (∏ i in s, f i) ~ᵤ (∏ i in s, g i) := by
  induction s using Finset.induction with
  

Proof state:
case empty
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
M : Type u_5
inst✝ : CommMonoid M
ι : Type u_6
f g : ι → M
h : ∀ i ∈ ∅, f i ~ᵤ g i
⊢ ∏ i in ∅, f i ~ᵤ ∏ i in ∅, g i

Next tactic:
| empty =>
    simp only [Finset.prod_empty]
    rfl
theorem Associated.prod {M : Type*} [CommMonoid M] {ι : Type*} (s : Finset ι) (f : ι → M)
    (g : ι → M) (h : ∀ i, i ∈ s → (f i) ~ᵤ (g i)) : (∏ i in s, f i) ~ᵤ (∏ i in s, g i) := by
  induction s using Finset.induction with
  | empty =>
    

Proof state:
case empty
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
M : Type u_5
inst✝ : CommMonoid M
ι : Type u_6
f g : ι → M
h : ∀ i ∈ ∅, f i ~ᵤ g i
⊢ ∏ i in ∅, f i ~ᵤ ∏ i in ∅, g i

Next tactic:
simp only [Finset.prod_empty]
theorem Associated.prod {M : Type*} [CommMonoid M] {ι : Type*} (s : Finset ι) (f : ι → M)
    (g : ι → M) (h : ∀ i, i ∈ s → (f i) ~ᵤ (g i)) : (∏ i in s, f i) ~ᵤ (∏ i in s, g i) := by
  induction s using Finset.induction with
  | empty =>
    simp only [Finset.prod_empty]
    

Proof state:
case empty
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
M : Type u_5
inst✝ : CommMonoid M
ι : Type u_6
f g : ι → M
h : ∀ i ∈ ∅, f i ~ᵤ g i
⊢ 1 ~ᵤ 1

Next tactic:
rfl
theorem Associated.prod {M : Type*} [CommMonoid M] {ι : Type*} (s : Finset ι) (f : ι → M)
    (g : ι → M) (h : ∀ i, i ∈ s → (f i) ~ᵤ (g i)) : (∏ i in s, f i) ~ᵤ (∏ i in s, g i) := by
  induction s using Finset.induction with
  | empty =>
    simp only [Finset.prod_empty]
    rfl
  

Proof state:
case insert
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
M : Type u_5
inst✝ : CommMonoid M
ι : Type u_6
s✝ : Finset ι
f g : ι → M
j : ι
s : Finset ι
hjs : j ∉ s
IH : (∀ i ∈ s, f i ~ᵤ g i) → ∏ i in s, f i ~ᵤ ∏ i in s, g i
h : ∀ i ∈ insert j s, f i ~ᵤ g i
⊢ ∏ i in insert j s, f i ~ᵤ ∏ i in insert j s, g i

Next tactic:
| @insert j s hjs IH =>
    classical
    convert_to (∏ i in insert j s, f i) ~ᵤ (∏ i in insert j s, g i)
    rw [Finset.prod_insert hjs, Finset.prod_insert hjs]
    exact Associated.mul_mul (h j (Finset.mem_insert_self j s))
      (IH (fun i hi ↦ h i (Finset.mem_insert_of_mem hi)))
theorem Associated.prod {M : Type*} [CommMonoid M] {ι : Type*} (s : Finset ι) (f : ι → M)
    (g : ι → M) (h : ∀ i, i ∈ s → (f i) ~ᵤ (g i)) : (∏ i in s, f i) ~ᵤ (∏ i in s, g i) := by
  induction s using Finset.induction with
  | empty =>
    simp only [Finset.prod_empty]
    rfl
  | @insert j s hjs IH =>
    

Proof state:
case insert
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
M : Type u_5
inst✝ : CommMonoid M
ι : Type u_6
s✝ : Finset ι
f g : ι → M
j : ι
s : Finset ι
hjs : j ∉ s
IH : (∀ i ∈ s, f i ~ᵤ g i) → ∏ i in s, f i ~ᵤ ∏ i in s, g i
h : ∀ i ∈ insert j s, f i ~ᵤ g i
⊢ ∏ i in insert j s, f i ~ᵤ ∏ i in insert j s, g i

Next tactic:
classical
    convert_to (∏ i in insert j s, f i) ~ᵤ (∏ i in insert j s, g i)
    rw [Finset.prod_insert hjs, Finset.prod_insert hjs]
    exact Associated.mul_mul (h j (Finset.mem_insert_self j s))
      (IH (fun i hi ↦ h i (Finset.mem_insert_of_mem hi)))
theorem Associated.prod {M : Type*} [CommMonoid M] {ι : Type*} (s : Finset ι) (f : ι → M)
    (g : ι → M) (h : ∀ i, i ∈ s → (f i) ~ᵤ (g i)) : (∏ i in s, f i) ~ᵤ (∏ i in s, g i) := by
  induction s using Finset.induction with
  | empty =>
    simp only [Finset.prod_empty]
    rfl
  | @insert j s hjs IH =>
    classical
    

Proof state:
case insert
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
M : Type u_5
inst✝ : CommMonoid M
ι : Type u_6
s✝ : Finset ι
f g : ι → M
j : ι
s : Finset ι
hjs : j ∉ s
IH : (∀ i ∈ s, f i ~ᵤ g i) → ∏ i in s, f i ~ᵤ ∏ i in s, g i
h : ∀ i ∈ insert j s, f i ~ᵤ g i
⊢ ∏ i in insert j s, f i ~ᵤ ∏ i in insert j s, g i

Next tactic:
convert_to (∏ i in insert j s, f i) ~ᵤ (∏ i in insert j s, g i)
theorem Associated.prod {M : Type*} [CommMonoid M] {ι : Type*} (s : Finset ι) (f : ι → M)
    (g : ι → M) (h : ∀ i, i ∈ s → (f i) ~ᵤ (g i)) : (∏ i in s, f i) ~ᵤ (∏ i in s, g i) := by
  induction s using Finset.induction with
  | empty =>
    simp only [Finset.prod_empty]
    rfl
  | @insert j s hjs IH =>
    classical
    convert_to (∏ i in insert j s, f i) ~ᵤ (∏ i in insert j s, g i)
    

Proof state:
case insert
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
M : Type u_5
inst✝ : CommMonoid M
ι : Type u_6
s✝ : Finset ι
f g : ι → M
j : ι
s : Finset ι
hjs : j ∉ s
IH : (∀ i ∈ s, f i ~ᵤ g i) → ∏ i in s, f i ~ᵤ ∏ i in s, g i
h : ∀ i ∈ insert j s, f i ~ᵤ g i
⊢ ∏ i in insert j s, f i ~ᵤ ∏ i in insert j s, g i

Next tactic:
rw [Finset.prod_insert hjs, Finset.prod_insert hjs]
theorem Associated.prod {M : Type*} [CommMonoid M] {ι : Type*} (s : Finset ι) (f : ι → M)
    (g : ι → M) (h : ∀ i, i ∈ s → (f i) ~ᵤ (g i)) : (∏ i in s, f i) ~ᵤ (∏ i in s, g i) := by
  induction s using Finset.induction with
  | empty =>
    simp only [Finset.prod_empty]
    rfl
  | @insert j s hjs IH =>
    classical
    convert_to (∏ i in insert j s, f i) ~ᵤ (∏ i in insert j s, g i)
    rw [Finset.prod_insert hjs, Finset.prod_insert hjs]
    

Proof state:
case insert
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
M : Type u_5
inst✝ : CommMonoid M
ι : Type u_6
s✝ : Finset ι
f g : ι → M
j : ι
s : Finset ι
hjs : j ∉ s
IH : (∀ i ∈ s, f i ~ᵤ g i) → ∏ i in s, f i ~ᵤ ∏ i in s, g i
h : ∀ i ∈ insert j s, f i ~ᵤ g i
⊢ f j * ∏ x in s, f x ~ᵤ g j * ∏ x in s, g x

Next tactic:
exact Associated.mul_mul (h j (Finset.mem_insert_self j s))
      (IH (fun i hi ↦ h i (Finset.mem_insert_of_mem hi)))
theorem exists_associated_mem_of_dvd_prod [CancelCommMonoidWithZero α] {p : α} (hp : Prime p)
    {s : Multiset α} : (∀ r ∈ s, Prime r) → p ∣ s.prod → ∃ q ∈ s, p ~ᵤ q :=
  Multiset.induction_on s (by 

Proof state:
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
inst✝ : CancelCommMonoidWithZero α
p : α
hp : Prime p
s : Multiset α
⊢ (∀ r ∈ 0, Prime r) → p ∣ Multiset.prod 0 → ∃ q ∈ 0, p ~ᵤ q

Next tactic:
simp [mt isUnit_iff_dvd_one.2 hp.not_unit]
theorem exists_associated_mem_of_dvd_prod [CancelCommMonoidWithZero α] {p : α} (hp : Prime p)
    {s : Multiset α} : (∀ r ∈ s, Prime r) → p ∣ s.prod → ∃ q ∈ s, p ~ᵤ q :=
  Multiset.induction_on s (by simp [mt isUnit_iff_dvd_one.2 hp.not_unit]) fun a s ih hs hps => by
    

Proof state:
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
inst✝ : CancelCommMonoidWithZero α
p : α
hp : Prime p
s✝ : Multiset α
a : α
s : Multiset α
ih : (∀ r ∈ s, Prime r) → p ∣ Multiset.prod s → ∃ q ∈ s, p ~ᵤ q
hs : ∀ r ∈ a ::ₘ s, Prime r
hps : p ∣ Multiset.prod (a ::ₘ s)
⊢ ∃ q ∈ a ::ₘ s, p ~ᵤ q

Next tactic:
rw [Multiset.prod_cons] at hps
theorem exists_associated_mem_of_dvd_prod [CancelCommMonoidWithZero α] {p : α} (hp : Prime p)
    {s : Multiset α} : (∀ r ∈ s, Prime r) → p ∣ s.prod → ∃ q ∈ s, p ~ᵤ q :=
  Multiset.induction_on s (by simp [mt isUnit_iff_dvd_one.2 hp.not_unit]) fun a s ih hs hps => by
    rw [Multiset.prod_cons] at hps
    

Proof state:
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
inst✝ : CancelCommMonoidWithZero α
p : α
hp : Prime p
s✝ : Multiset α
a : α
s : Multiset α
ih : (∀ r ∈ s, Prime r) → p ∣ Multiset.prod s → ∃ q ∈ s, p ~ᵤ q
hs : ∀ r ∈ a ::ₘ s, Prime r
hps : p ∣ a * Multiset.prod s
⊢ ∃ q ∈ a ::ₘ s, p ~ᵤ q

Next tactic:
cases' hp.dvd_or_dvd hps with h h
theorem exists_associated_mem_of_dvd_prod [CancelCommMonoidWithZero α] {p : α} (hp : Prime p)
    {s : Multiset α} : (∀ r ∈ s, Prime r) → p ∣ s.prod → ∃ q ∈ s, p ~ᵤ q :=
  Multiset.induction_on s (by simp [mt isUnit_iff_dvd_one.2 hp.not_unit]) fun a s ih hs hps => by
    rw [Multiset.prod_cons] at hps
    cases' hp.dvd_or_dvd hps with h h
    · 

Proof state:
case inl
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
inst✝ : CancelCommMonoidWithZero α
p : α
hp : Prime p
s✝ : Multiset α
a : α
s : Multiset α
ih : (∀ r ∈ s, Prime r) → p ∣ Multiset.prod s → ∃ q ∈ s, p ~ᵤ q
hs : ∀ r ∈ a ::ₘ s, Prime r
hps : p ∣ a * Multiset.prod s
h : p ∣ a
⊢ ∃ q ∈ a ::ₘ s, p ~ᵤ q

Next tactic:
have hap := hs a (Multiset.mem_cons.2 (Or.inl rfl))
theorem exists_associated_mem_of_dvd_prod [CancelCommMonoidWithZero α] {p : α} (hp : Prime p)
    {s : Multiset α} : (∀ r ∈ s, Prime r) → p ∣ s.prod → ∃ q ∈ s, p ~ᵤ q :=
  Multiset.induction_on s (by simp [mt isUnit_iff_dvd_one.2 hp.not_unit]) fun a s ih hs hps => by
    rw [Multiset.prod_cons] at hps
    cases' hp.dvd_or_dvd hps with h h
    · have hap := hs a (Multiset.mem_cons.2 (Or.inl rfl))
      

Proof state:
case inl
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
inst✝ : CancelCommMonoidWithZero α
p : α
hp : Prime p
s✝ : Multiset α
a : α
s : Multiset α
ih : (∀ r ∈ s, Prime r) → p ∣ Multiset.prod s → ∃ q ∈ s, p ~ᵤ q
hs : ∀ r ∈ a ::ₘ s, Prime r
hps : p ∣ a * Multiset.prod s
h : p ∣ a
hap : Prime a
⊢ ∃ q ∈ a ::ₘ s, p ~ᵤ q

Next tactic:
exact ⟨a, Multiset.mem_cons_self a _, hp.associated_of_dvd hap h⟩
theorem exists_associated_mem_of_dvd_prod [CancelCommMonoidWithZero α] {p : α} (hp : Prime p)
    {s : Multiset α} : (∀ r ∈ s, Prime r) → p ∣ s.prod → ∃ q ∈ s, p ~ᵤ q :=
  Multiset.induction_on s (by simp [mt isUnit_iff_dvd_one.2 hp.not_unit]) fun a s ih hs hps => by
    rw [Multiset.prod_cons] at hps
    cases' hp.dvd_or_dvd hps with h h
    · have hap := hs a (Multiset.mem_cons.2 (Or.inl rfl))
      exact ⟨a, Multiset.mem_cons_self a _, hp.associated_of_dvd hap h⟩
    · 

Proof state:
case inr
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
inst✝ : CancelCommMonoidWithZero α
p : α
hp : Prime p
s✝ : Multiset α
a : α
s : Multiset α
ih : (∀ r ∈ s, Prime r) → p ∣ Multiset.prod s → ∃ q ∈ s, p ~ᵤ q
hs : ∀ r ∈ a ::ₘ s, Prime r
hps : p ∣ a * Multiset.prod s
h : p ∣ Multiset.prod s
⊢ ∃ q ∈ a ::ₘ s, p ~ᵤ q

Next tactic:
rcases ih (fun r hr => hs _ (Multiset.mem_cons.2 (Or.inr hr))) h with ⟨q, hq₁, hq₂⟩
theorem exists_associated_mem_of_dvd_prod [CancelCommMonoidWithZero α] {p : α} (hp : Prime p)
    {s : Multiset α} : (∀ r ∈ s, Prime r) → p ∣ s.prod → ∃ q ∈ s, p ~ᵤ q :=
  Multiset.induction_on s (by simp [mt isUnit_iff_dvd_one.2 hp.not_unit]) fun a s ih hs hps => by
    rw [Multiset.prod_cons] at hps
    cases' hp.dvd_or_dvd hps with h h
    · have hap := hs a (Multiset.mem_cons.2 (Or.inl rfl))
      exact ⟨a, Multiset.mem_cons_self a _, hp.associated_of_dvd hap h⟩
    · rcases ih (fun r hr => hs _ (Multiset.mem_cons.2 (Or.inr hr))) h with ⟨q, hq₁, hq₂⟩
      

Proof state:
case inr.intro.intro
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
inst✝ : CancelCommMonoidWithZero α
p : α
hp : Prime p
s✝ : Multiset α
a : α
s : Multiset α
ih : (∀ r ∈ s, Prime r) → p ∣ Multiset.prod s → ∃ q ∈ s, p ~ᵤ q
hs : ∀ r ∈ a ::ₘ s, Prime r
hps : p ∣ a * Multiset.prod s
h : p ∣ Multiset.prod s
q : α
hq₁ : q ∈ s
hq₂ : p ~ᵤ q
⊢ ∃ q ∈ a ::ₘ s, p ~ᵤ q

Next tactic:
exact ⟨q, Multiset.mem_cons.2 (Or.inr hq₁), hq₂⟩
theorem Multiset.prod_primes_dvd [CancelCommMonoidWithZero α]
    [∀ a : α, DecidablePred (Associated a)] {s : Multiset α} (n : α) (h : ∀ a ∈ s, Prime a)
    (div : ∀ a ∈ s, a ∣ n) (uniq : ∀ a, s.countP (Associated a) ≤ 1) : s.prod ∣ n := by
  

Proof state:
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
inst✝¹ : CancelCommMonoidWithZero α
inst✝ : (a : α) → DecidablePred (Associated a)
s : Multiset α
n : α
h : ∀ a ∈ s, Prime a
div : ∀ a ∈ s, a ∣ n
uniq : ∀ (a : α), countP (Associated a) s ≤ 1
⊢ prod s ∣ n

Next tactic:
induction' s using Multiset.induction_on with a s induct n primes divs generalizing n
theorem Multiset.prod_primes_dvd [CancelCommMonoidWithZero α]
    [∀ a : α, DecidablePred (Associated a)] {s : Multiset α} (n : α) (h : ∀ a ∈ s, Prime a)
    (div : ∀ a ∈ s, a ∣ n) (uniq : ∀ a, s.countP (Associated a) ≤ 1) : s.prod ∣ n := by
  induction' s using Multiset.induction_on with a s induct n primes divs generalizing n
  · 

Proof state:
case empty
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
inst✝¹ : CancelCommMonoidWithZero α
inst✝ : (a : α) → DecidablePred (Associated a)
n : α
h : ∀ a ∈ 0, Prime a
div : ∀ a ∈ 0, a ∣ n
uniq : ∀ (a : α), countP (Associated a) 0 ≤ 1
⊢ prod 0 ∣ n

Next tactic:
simp only [Multiset.prod_zero, one_dvd]
theorem Multiset.prod_primes_dvd [CancelCommMonoidWithZero α]
    [∀ a : α, DecidablePred (Associated a)] {s : Multiset α} (n : α) (h : ∀ a ∈ s, Prime a)
    (div : ∀ a ∈ s, a ∣ n) (uniq : ∀ a, s.countP (Associated a) ≤ 1) : s.prod ∣ n := by
  induction' s using Multiset.induction_on with a s induct n primes divs generalizing n
  · simp only [Multiset.prod_zero, one_dvd]
  · 

Proof state:
case cons
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
inst✝¹ : CancelCommMonoidWithZero α
inst✝ : (a : α) → DecidablePred (Associated a)
a : α
s : Multiset α
induct : ∀ (n : α), (∀ a ∈ s, Prime a) → (∀ a ∈ s, a ∣ n) → (∀ (a : α), countP (Associated a) s ≤ 1) → prod s ∣ n
n : α
h : ∀ a_1 ∈ a ::ₘ s, Prime a_1
div : ∀ a_1 ∈ a ::ₘ s, a_1 ∣ n
uniq : ∀ (a_1 : α), countP (Associated a_1) (a ::ₘ s) ≤ 1
⊢ prod (a ::ₘ s) ∣ n

Next tactic:
rw [Multiset.prod_cons]
theorem Multiset.prod_primes_dvd [CancelCommMonoidWithZero α]
    [∀ a : α, DecidablePred (Associated a)] {s : Multiset α} (n : α) (h : ∀ a ∈ s, Prime a)
    (div : ∀ a ∈ s, a ∣ n) (uniq : ∀ a, s.countP (Associated a) ≤ 1) : s.prod ∣ n := by
  induction' s using Multiset.induction_on with a s induct n primes divs generalizing n
  · simp only [Multiset.prod_zero, one_dvd]
  · rw [Multiset.prod_cons]
    

Proof state:
case cons
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
inst✝¹ : CancelCommMonoidWithZero α
inst✝ : (a : α) → DecidablePred (Associated a)
a : α
s : Multiset α
induct : ∀ (n : α), (∀ a ∈ s, Prime a) → (∀ a ∈ s, a ∣ n) → (∀ (a : α), countP (Associated a) s ≤ 1) → prod s ∣ n
n : α
h : ∀ a_1 ∈ a ::ₘ s, Prime a_1
div : ∀ a_1 ∈ a ::ₘ s, a_1 ∣ n
uniq : ∀ (a_1 : α), countP (Associated a_1) (a ::ₘ s) ≤ 1
⊢ a * prod s ∣ n

Next tactic:
obtain ⟨k, rfl⟩ : a ∣ n := div a (Multiset.mem_cons_self a s)
theorem Multiset.prod_primes_dvd [CancelCommMonoidWithZero α]
    [∀ a : α, DecidablePred (Associated a)] {s : Multiset α} (n : α) (h : ∀ a ∈ s, Prime a)
    (div : ∀ a ∈ s, a ∣ n) (uniq : ∀ a, s.countP (Associated a) ≤ 1) : s.prod ∣ n := by
  induction' s using Multiset.induction_on with a s induct n primes divs generalizing n
  · simp only [Multiset.prod_zero, one_dvd]
  · rw [Multiset.prod_cons]
    obtain ⟨k, rfl⟩ : a ∣ n := div a (Multiset.mem_cons_self a s)
    

Proof state:
case cons.intro
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
inst✝¹ : CancelCommMonoidWithZero α
inst✝ : (a : α) → DecidablePred (Associated a)
a : α
s : Multiset α
induct : ∀ (n : α), (∀ a ∈ s, Prime a) → (∀ a ∈ s, a ∣ n) → (∀ (a : α), countP (Associated a) s ≤ 1) → prod s ∣ n
h : ∀ a_1 ∈ a ::ₘ s, Prime a_1
uniq : ∀ (a_1 : α), countP (Associated a_1) (a ::ₘ s) ≤ 1
k : α
div : ∀ a_1 ∈ a ::ₘ s, a_1 ∣ a * k
⊢ a * prod s ∣ a * k

Next tactic:
apply mul_dvd_mul_left a
theorem Multiset.prod_primes_dvd [CancelCommMonoidWithZero α]
    [∀ a : α, DecidablePred (Associated a)] {s : Multiset α} (n : α) (h : ∀ a ∈ s, Prime a)
    (div : ∀ a ∈ s, a ∣ n) (uniq : ∀ a, s.countP (Associated a) ≤ 1) : s.prod ∣ n := by
  induction' s using Multiset.induction_on with a s induct n primes divs generalizing n
  · simp only [Multiset.prod_zero, one_dvd]
  · rw [Multiset.prod_cons]
    obtain ⟨k, rfl⟩ : a ∣ n := div a (Multiset.mem_cons_self a s)
    apply mul_dvd_mul_left a
    

Proof state:
case cons.intro
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
inst✝¹ : CancelCommMonoidWithZero α
inst✝ : (a : α) → DecidablePred (Associated a)
a : α
s : Multiset α
induct : ∀ (n : α), (∀ a ∈ s, Prime a) → (∀ a ∈ s, a ∣ n) → (∀ (a : α), countP (Associated a) s ≤ 1) → prod s ∣ n
h : ∀ a_1 ∈ a ::ₘ s, Prime a_1
uniq : ∀ (a_1 : α), countP (Associated a_1) (a ::ₘ s) ≤ 1
k : α
div : ∀ a_1 ∈ a ::ₘ s, a_1 ∣ a * k
⊢ prod s ∣ k

Next tactic:
refine induct _ (fun a ha => h a (Multiset.mem_cons_of_mem ha)) (fun b b_in_s => ?_)
      fun a => (Multiset.countP_le_of_le _ (Multiset.le_cons_self _ _)).trans (uniq a)
theorem Multiset.prod_primes_dvd [CancelCommMonoidWithZero α]
    [∀ a : α, DecidablePred (Associated a)] {s : Multiset α} (n : α) (h : ∀ a ∈ s, Prime a)
    (div : ∀ a ∈ s, a ∣ n) (uniq : ∀ a, s.countP (Associated a) ≤ 1) : s.prod ∣ n := by
  induction' s using Multiset.induction_on with a s induct n primes divs generalizing n
  · simp only [Multiset.prod_zero, one_dvd]
  · rw [Multiset.prod_cons]
    obtain ⟨k, rfl⟩ : a ∣ n := div a (Multiset.mem_cons_self a s)
    apply mul_dvd_mul_left a
    refine induct _ (fun a ha => h a (Multiset.mem_cons_of_mem ha)) (fun b b_in_s => ?_)
      fun a => (Multiset.countP_le_of_le _ (Multiset.le_cons_self _ _)).trans (uniq a)
    · 

Proof state:
case cons.intro
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
inst✝¹ : CancelCommMonoidWithZero α
inst✝ : (a : α) → DecidablePred (Associated a)
a : α
s : Multiset α
induct : ∀ (n : α), (∀ a ∈ s, Prime a) → (∀ a ∈ s, a ∣ n) → (∀ (a : α), countP (Associated a) s ≤ 1) → prod s ∣ n
h : ∀ a_1 ∈ a ::ₘ s, Prime a_1
uniq : ∀ (a_1 : α), countP (Associated a_1) (a ::ₘ s) ≤ 1
k : α
div : ∀ a_1 ∈ a ::ₘ s, a_1 ∣ a * k
b : α
b_in_s : b ∈ s
⊢ b ∣ k

Next tactic:
have b_div_n := div b (Multiset.mem_cons_of_mem b_in_s)
theorem Multiset.prod_primes_dvd [CancelCommMonoidWithZero α]
    [∀ a : α, DecidablePred (Associated a)] {s : Multiset α} (n : α) (h : ∀ a ∈ s, Prime a)
    (div : ∀ a ∈ s, a ∣ n) (uniq : ∀ a, s.countP (Associated a) ≤ 1) : s.prod ∣ n := by
  induction' s using Multiset.induction_on with a s induct n primes divs generalizing n
  · simp only [Multiset.prod_zero, one_dvd]
  · rw [Multiset.prod_cons]
    obtain ⟨k, rfl⟩ : a ∣ n := div a (Multiset.mem_cons_self a s)
    apply mul_dvd_mul_left a
    refine induct _ (fun a ha => h a (Multiset.mem_cons_of_mem ha)) (fun b b_in_s => ?_)
      fun a => (Multiset.countP_le_of_le _ (Multiset.le_cons_self _ _)).trans (uniq a)
    · have b_div_n := div b (Multiset.mem_cons_of_mem b_in_s)
      

Proof state:
case cons.intro
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
inst✝¹ : CancelCommMonoidWithZero α
inst✝ : (a : α) → DecidablePred (Associated a)
a : α
s : Multiset α
induct : ∀ (n : α), (∀ a ∈ s, Prime a) → (∀ a ∈ s, a ∣ n) → (∀ (a : α), countP (Associated a) s ≤ 1) → prod s ∣ n
h : ∀ a_1 ∈ a ::ₘ s, Prime a_1
uniq : ∀ (a_1 : α), countP (Associated a_1) (a ::ₘ s) ≤ 1
k : α
div : ∀ a_1 ∈ a ::ₘ s, a_1 ∣ a * k
b : α
b_in_s : b ∈ s
b_div_n : b ∣ a * k
⊢ b ∣ k

Next tactic:
have a_prime := h a (Multiset.mem_cons_self a s)
theorem Multiset.prod_primes_dvd [CancelCommMonoidWithZero α]
    [∀ a : α, DecidablePred (Associated a)] {s : Multiset α} (n : α) (h : ∀ a ∈ s, Prime a)
    (div : ∀ a ∈ s, a ∣ n) (uniq : ∀ a, s.countP (Associated a) ≤ 1) : s.prod ∣ n := by
  induction' s using Multiset.induction_on with a s induct n primes divs generalizing n
  · simp only [Multiset.prod_zero, one_dvd]
  · rw [Multiset.prod_cons]
    obtain ⟨k, rfl⟩ : a ∣ n := div a (Multiset.mem_cons_self a s)
    apply mul_dvd_mul_left a
    refine induct _ (fun a ha => h a (Multiset.mem_cons_of_mem ha)) (fun b b_in_s => ?_)
      fun a => (Multiset.countP_le_of_le _ (Multiset.le_cons_self _ _)).trans (uniq a)
    · have b_div_n := div b (Multiset.mem_cons_of_mem b_in_s)
      have a_prime := h a (Multiset.mem_cons_self a s)
      

Proof state:
case cons.intro
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
inst✝¹ : CancelCommMonoidWithZero α
inst✝ : (a : α) → DecidablePred (Associated a)
a : α
s : Multiset α
induct : ∀ (n : α), (∀ a ∈ s, Prime a) → (∀ a ∈ s, a ∣ n) → (∀ (a : α), countP (Associated a) s ≤ 1) → prod s ∣ n
h : ∀ a_1 ∈ a ::ₘ s, Prime a_1
uniq : ∀ (a_1 : α), countP (Associated a_1) (a ::ₘ s) ≤ 1
k : α
div : ∀ a_1 ∈ a ::ₘ s, a_1 ∣ a * k
b : α
b_in_s : b ∈ s
b_div_n : b ∣ a * k
a_prime : Prime a
⊢ b ∣ k

Next tactic:
have b_prime := h b (Multiset.mem_cons_of_mem b_in_s)
theorem Multiset.prod_primes_dvd [CancelCommMonoidWithZero α]
    [∀ a : α, DecidablePred (Associated a)] {s : Multiset α} (n : α) (h : ∀ a ∈ s, Prime a)
    (div : ∀ a ∈ s, a ∣ n) (uniq : ∀ a, s.countP (Associated a) ≤ 1) : s.prod ∣ n := by
  induction' s using Multiset.induction_on with a s induct n primes divs generalizing n
  · simp only [Multiset.prod_zero, one_dvd]
  · rw [Multiset.prod_cons]
    obtain ⟨k, rfl⟩ : a ∣ n := div a (Multiset.mem_cons_self a s)
    apply mul_dvd_mul_left a
    refine induct _ (fun a ha => h a (Multiset.mem_cons_of_mem ha)) (fun b b_in_s => ?_)
      fun a => (Multiset.countP_le_of_le _ (Multiset.le_cons_self _ _)).trans (uniq a)
    · have b_div_n := div b (Multiset.mem_cons_of_mem b_in_s)
      have a_prime := h a (Multiset.mem_cons_self a s)
      have b_prime := h b (Multiset.mem_cons_of_mem b_in_s)
      

Proof state:
case cons.intro
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
inst✝¹ : CancelCommMonoidWithZero α
inst✝ : (a : α) → DecidablePred (Associated a)
a : α
s : Multiset α
induct : ∀ (n : α), (∀ a ∈ s, Prime a) → (∀ a ∈ s, a ∣ n) → (∀ (a : α), countP (Associated a) s ≤ 1) → prod s ∣ n
h : ∀ a_1 ∈ a ::ₘ s, Prime a_1
uniq : ∀ (a_1 : α), countP (Associated a_1) (a ::ₘ s) ≤ 1
k : α
div : ∀ a_1 ∈ a ::ₘ s, a_1 ∣ a * k
b : α
b_in_s : b ∈ s
b_div_n : b ∣ a * k
a_prime : Prime a
b_prime : Prime b
⊢ b ∣ k

Next tactic:
refine' (b_prime.dvd_or_dvd b_div_n).resolve_left fun b_div_a => _
theorem Multiset.prod_primes_dvd [CancelCommMonoidWithZero α]
    [∀ a : α, DecidablePred (Associated a)] {s : Multiset α} (n : α) (h : ∀ a ∈ s, Prime a)
    (div : ∀ a ∈ s, a ∣ n) (uniq : ∀ a, s.countP (Associated a) ≤ 1) : s.prod ∣ n := by
  induction' s using Multiset.induction_on with a s induct n primes divs generalizing n
  · simp only [Multiset.prod_zero, one_dvd]
  · rw [Multiset.prod_cons]
    obtain ⟨k, rfl⟩ : a ∣ n := div a (Multiset.mem_cons_self a s)
    apply mul_dvd_mul_left a
    refine induct _ (fun a ha => h a (Multiset.mem_cons_of_mem ha)) (fun b b_in_s => ?_)
      fun a => (Multiset.countP_le_of_le _ (Multiset.le_cons_self _ _)).trans (uniq a)
    · have b_div_n := div b (Multiset.mem_cons_of_mem b_in_s)
      have a_prime := h a (Multiset.mem_cons_self a s)
      have b_prime := h b (Multiset.mem_cons_of_mem b_in_s)
      refine' (b_prime.dvd_or_dvd b_div_n).resolve_left fun b_div_a => _
      

Proof state:
case cons.intro
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
inst✝¹ : CancelCommMonoidWithZero α
inst✝ : (a : α) → DecidablePred (Associated a)
a : α
s : Multiset α
induct : ∀ (n : α), (∀ a ∈ s, Prime a) → (∀ a ∈ s, a ∣ n) → (∀ (a : α), countP (Associated a) s ≤ 1) → prod s ∣ n
h : ∀ a_1 ∈ a ::ₘ s, Prime a_1
uniq : ∀ (a_1 : α), countP (Associated a_1) (a ::ₘ s) ≤ 1
k : α
div : ∀ a_1 ∈ a ::ₘ s, a_1 ∣ a * k
b : α
b_in_s : b ∈ s
b_div_n : b ∣ a * k
a_prime : Prime a
b_prime : Prime b
b_div_a : b ∣ a
⊢ False

Next tactic:
have assoc := b_prime.associated_of_dvd a_prime b_div_a