English
For finite dimensional α, the height of the last element of the longest LTSeries equals krullDim α.
Русский
Для конечной размерности α высота последнего элемента самой длинной LTSeries равна размерности Крулла.
LaTeX
$$height((\mathrm{LTSeries.longestOf}(\alpha)).last) = \operatorname{krullDim}(\alpha)$$
Lean4
@[simp]
theorem _root_.LTSeries.height_last_longestOf [FiniteDimensionalOrder α] :
height (LTSeries.longestOf α).last = krullDim α :=
by
refine le_antisymm (height_le_krullDim _) ?_
rw [krullDim_eq_length_of_finiteDimensionalOrder, height]
norm_cast
exact le_iSup_iff.mpr <| fun _ h ↦ iSup_le_iff.mp (h _) le_rfl