Equation374794 not implies Equation2
InfModel.Equation374794_not_implies_Equation2
Plain-language statement
However, Equation374794 doesn't imply Equation2.
Exact Lean statement
@[equational_result] theorem Equation374794_not_implies_Equation2 : ∃ (G : Type) (_ : Magma G), Equation374794 G ∧ ¬Equation2 G
Formal artifact
Lean source
@[equational_result]theorem Equation374794_not_implies_Equation2 : ∃ (G : Type) (_ : Magma G), Equation374794 G ∧ ¬Equation2 G := by letI : Magma ℕ+ := { op := fun a b ↦ if a = b then 2^a.val else if a = 1 then 3^b.val else if a = 3 ^ (padicValNat 3 a) then Nat.toPNat' (padicValNat 3 a) else 1} refine ⟨ℕ+, this, ⟨fun x y z ↦ ?_, fun x ↦ nomatch (x 1 2)⟩⟩ unfold Magma.op simp only [this, ↓reduceIte, PNat.pow_coe, PNat.val_ofNat] have t1 (y : ℕ+) : 2 ^ (y : ℕ) ≠ y := by apply_fun PNat.val simp [ne_of_gt, Nat.lt_pow_self] have t3 (y : ℕ+) (n : ℕ) : (2 : ℕ+) ^ (y : ℕ) ≠ 3^n := by apply_fun PNat.val simp only [PNat.pow_coe, PNat.val_ofNat, ne_eq] intro nh apply eq_of_prime_pow_eq at nh · contradiction · exact Nat.prime_two.prime · exact Nat.prime_three.prime · simp have t2 (y : ℕ+) : (2 : ℕ+) ^ (y : ℕ) ≠ 1 := t3 y 0 have t4 (y : ℕ+) (n : ℕ) : (3 : ℕ+) ^ (y : ℕ) ≠ 2^n := by apply_fun PNat.val simp only [PNat.pow_coe, PNat.val_ofNat, ne_eq] intro nh apply eq_of_prime_pow_eq at nh · contradiction · exact Nat.prime_three.prime · exact Nat.prime_two.prime · simp have : Fact (Nat.Prime 2) := ⟨Nat.prime_two⟩ have : Fact (Nat.Prime 3) := ⟨Nat.prime_three⟩ simp only [t1, ↓reduceIte, t2, t3, PNat.val_ofNat, pow_one] by_cases hx : x = 1 · simp only [hx, ↓reduceIte, PNat.val_ofNat, PNat.ofNat_inj, OfNat.ofNat_ne_one, ne_eq, Nat.succ_ne_self, not_false_eq_true, padicValNat_primes, pow_zero] rw [if_neg] split_ifs · apply ne_of_lt simp only [← PNat.coe_lt_coe, PNat.val_ofNat, PNat.pow_coe] apply lt_self_pow₀ (by simp only [Nat.one_lt_ofNat]) apply one_lt_pow₀ (by simp only [Nat.one_lt_ofNat]) (by simp) · trivial simp only [Ne.symm hx, ↓reduceIte, PNat.pow_coe, PNat.val_ofNat, padicValNat.prime_pow, PNat.coe_toPNat'] rw [if_neg, if_neg] · simp [pow_eq_one_iff] · split · apply t4 · convert t4 _ 0- Project
- Equational Theories
- License
- Apache-2.0
- Commit
- 7e276a2d05e8
- Source
- equational_theories/InfModel.lean:39-88
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Plain-language statement
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