English
The toList of a CompositionSeries is sorted with respect to <.
Русский
Список toList композиционной серии отсортирован относительно порядка <.
LaTeX
$$$\\forall {X} [\\mathrm{Lattice}\\ X] [\\mathrm{JordanHolderLattice}\\ X],\\ (s : \\mathrm{CompositionSeries}\\ X)\\ (RelSeries.toList s)\\ \\mathrm{Sorted}\\ (<).$$$
Lean4
theorem toList_sorted (s : CompositionSeries X) : s.toList.Sorted (· < ·) :=
List.pairwise_iff_get.2 fun i j h => by
dsimp only [RelSeries.toList]
rw [List.get_ofFn, List.get_ofFn]
exact s.strictMono h