English
A variant illustrating the same principle with a finite set and interior subset containment via homothety.
Русский
Вариант иллюстрирует тот же принцип для конечного множества и вложения через гомотети через interior.
LaTeX
$$Finite(t) → t ⊆ interior(s) → ∀ᶠ δ in 𝓝(1), homothety(x,δ)''t ⊆ s$$
Lean4
/-- Embedding of an affine subspace to the ambient space, as a continuous affine map. -/
def subtypeA (s : AffineSubspace R P) [Nonempty s] : s →ᴬ[R] P
where
toAffineMap := s.subtype
cont := continuous_subtype_val