English
If span R s and span R t are disjoint and 0 ∉ s, then s and t are disjoint.
Русский
Если span R s и span R t не пересекаются и 0 ∉ s, то s и t также не пересекаются.
LaTeX
$$$$\text{Disjoint}(\operatorname{span} R s, \operatorname{span} R t) \Rightarrow \text{Disjoint}(s, t) $$$$
Lean4
theorem _root_.Disjoint.of_span₀ (hst : Disjoint (span R s) (span R t)) (h0s : 0 ∉ s) : Disjoint s t :=
by
rw [← diff_singleton_eq_self h0s]
exact hst.of_span