English
Span forms a Galois insertion with the set-coercion map from Submodule to Set.
Русский
Порождающееобразование образует инсерцию Гало с коэрцией: подпространство ⇢ множество.
LaTeX
$$$$\text{GI}(\operatorname{span}, \uparrow) \text{ is a Galois insertion }$$$$
Lean4
/-- `span` forms a Galois insertion with the coercion from submodule to set. -/
protected def gi : GaloisInsertion (@span R M _ _ _) (↑)
where
choice s _ := span R s
gc _ _ := span_le
le_l_u _ := subset_span
choice_eq _ _ := rfl