English
If f is Lipschitz with coefficient K, then the Hausdorff dimension of its range is at most the dimension of its domain.
Русский
Если отображение f Lipschitz с коэффициентом K, то размерность Хаусдорфа образа не больше размерности домена.
LaTeX
$$$$\\dimH(\\operatorname{range} f) \\leq \\dimH(\\operatorname{univ}).$$$$
Lean4
/-- If `f` is a Lipschitz continuous map, then the Hausdorff dimension of its range is at most the
Hausdorff dimension of its domain. -/
theorem dimH_range_le (h : LipschitzWith K f) : dimH (range f) ≤ dimH (univ : Set X) :=
@image_univ _ _ f ▸ h.dimH_image_le univ