R : Type u_1
inst✝¹ : MonoidWithZero R
inst✝ : Nontrivial R
⊢ ∃ x, ¬(x * x ∣ 0 → IsUnit x)
R : Type u_1
inst✝¹ : MonoidWithZero R
inst✝ : Nontrivial R
⊢ ¬Squarefree 0
erw [not_forall]
no goals
R : Type u_1
inst✝¹ : MonoidWithZero R
inst✝ : Nontrivial R
⊢ ∃ x, ¬(x * x ∣ 0 → IsUnit x)
exact ⟨0, by simp⟩
no goals
R : Type u_1
inst✝¹ : MonoidWithZero R
inst✝ : Nontrivial R
⊢ ¬(0 * 0 ∣ 0 → IsUnit 0)
simp