English
The coordChangeL and its variant coordChangeL' are equal when both are defined; they express the same fiberwise coordinate change on the intersection.
Русский
Изменение координат coordChangeL и его вариант coordChangeL' совпадают на пересечении областей определения.
LaTeX
$$$ coordChangeL R e e' b = (e.linearEquivAt R b hb)^{-1} \circ (e'.linearEquivAt R b hb').$$$
Lean4
theorem coe_coordChangeL (e e' : Trivialization F (π F E)) [e.IsLinear R] [e'.IsLinear R] {b : B}
(hb : b ∈ e.baseSet ∩ e'.baseSet) :
⇑(coordChangeL R e e' b) = (e.linearEquivAt R b hb.1).symm.trans (e'.linearEquivAt R b hb.2) :=
congr_arg (fun f : F ≃ₗ[R] F ↦ ⇑f) (dif_pos hb)