English
If t lies in the neighborhood of x within s (st ∈ 𝓝[s] x), then lieBracketWithin 𝕜 V W s x equals lieBracketWithin 𝕜 V W t x.
Русский
Если множество t совпадает внутри окрестности x по отношению к s, то скобка Ли внутри s в точке x равна скобке внутри t.
LaTeX
$$$(st: t \\in 𝓝[s] x) \\Rightarrow lieBracketWithin 𝕜 V W s x = lieBracketWithin 𝕜 V W t x$$$
Lean4
theorem lieBracketWithin_of_mem_nhdsWithin (st : t ∈ 𝓝[s] x) (hs : UniqueDiffWithinAt 𝕜 s x)
(hV : DifferentiableWithinAt 𝕜 V t x) (hW : DifferentiableWithinAt 𝕜 W t x) :
lieBracketWithin 𝕜 V W s x = lieBracketWithin 𝕜 V W t x := by
simp [lieBracketWithin, fderivWithin_of_mem_nhdsWithin st hs hV, fderivWithin_of_mem_nhdsWithin st hs hW]