English
From IsField we obtain that R is a domain; in particular there are no zero divisors.
Русский
Из IsField следует, что R является интегральной областью; нулевые делители отсутствуют.
LaTeX
$$$IsField\,R \Rightarrow IsDomain\,R$$$
Lean4
theorem isDomain {R : Type u} [Semiring R] (h : IsField R) : IsDomain R
where
mul_left_cancel_of_ne_zero ha _ _
hb := by
obtain ⟨x, hx⟩ := h.mul_inv_cancel ha
simpa [← mul_assoc, h.mul_comm, hx] using congr_arg (x * ·) hb
mul_right_cancel_of_ne_zero ha _ _
hb := by
obtain ⟨x, hx⟩ := h.mul_inv_cancel ha
simpa [mul_assoc, hx] using congr_arg (· * x) hb
exists_pair_ne := h.exists_pair_ne