English
A convex independent family remains convex independent when restricted to any subset via subtype.
Русский
При ограничении семейства до подмножества через субтип независимость сохраняется.
LaTeX
$$$\\text{ConvexIndependent}_{\\mathbb{k}}(p) \\Rightarrow \\forall s,\\; \\text{ConvexIndependent}_{\\mathbb{k}}(p|_{s})$$$
Lean4
/-- If a family is convex independent, so is any subfamily indexed by a subtype of the index type.
-/
protected theorem subtype {p : ι → E} (hc : ConvexIndependent 𝕜 p) (s : Set ι) : ConvexIndependent 𝕜 fun i : s => p i :=
hc.comp_embedding (Embedding.subtype _)