1. 0 ≠ 1
2. u : ℤ
3. v : ℤ
4. ¬(v = 0 ∈ ℤ)
5. (u * v) = 0 ∈ ℤ
⊢ u = 0 ∈ ℤ
{ InstLemma `int_entire` [u; v] THENA Auto⋅ }
6. (u = 0 ∈ ℤ) ∨ (v = 0 ∈ ℤ)