English
If a germ-invariant property holds for two charts, then lift properties agree after composition with these charts.
Русский
Если жерменно-инвариантное свойство верно для двух чартов, то свойства подъёма согласуются после композиции с чартами.
LaTeX
$$$P(f\!\circ\! g\!\circ\! e^{-1})(s)(x) \iff P(f'\!\circ\! g\!\circ\! e'^{-1})(s)(x).$$$
Lean4
theorem liftPropWithinAt_inter' (ht : t ∈ 𝓝[s] x) : LiftPropWithinAt P g (s ∩ t) x ↔ LiftPropWithinAt P g s x :=
by
rw [liftPropWithinAt_iff', liftPropWithinAt_iff', continuousWithinAt_inter' ht, hG.congr_set]
simp_rw [eventuallyEq_set, mem_preimage,
(chartAt _ x).eventually_nhds' (fun x ↦ x ∈ s ∩ t ↔ x ∈ s) (mem_chart_source _ x)]
exact (mem_nhdsWithin_iff_eventuallyEq.mp ht).symm.mem_iff