English
For any c ∈ F, HasFDerivWithinAt (x ↦ f(x) − c) f' s x is equivalent to HasFDerivWithinAt f f' s x; subtracting a constant does not affect the derivative within a set.
Русский
Для любого c ∈ F равносильно HasFDerivWithinAt (x ↦ f(x) − c) f' s x и HasFDerivWithinAt f f' s x; вычитание константы не изменяет производную внутри множества.
LaTeX
$$$ HasFDerivWithinAt (x \\mapsto f(x) - c) f' s x \\iff HasFDerivWithinAt f f' s x $$$
Lean4
@[simp]
theorem hasFDerivWithinAt_sub_const_iff (c : F) : HasFDerivWithinAt (f · - c) f' s x ↔ HasFDerivWithinAt f f' s x :=
hasFDerivAtFilter_sub_const_iff c