English
If two FineSubfamilyOn data (v,f,s) are equal to (v',f',s') under appropriate equalities, then the corresponding indices coincide.
Русский
Если два набора данных тонкого подподсемейства (v,f,s) равны соответствующими равенствами (v',f',s'), то их индексы совпадают.
LaTeX
$$$(e_v:eqa v v')\\,(e_f:eqa f f')\\,(e_s:eqa s s')\\;:\\; h.FineSubfamilyOn f s \\to h'.FineSubfamilyOn f' s'\\Rightarrow h.index = h'.index.$$$
Lean4
/-- Given `h : v.FineSubfamilyOn f s`, then `h.covering p` is a set in the family,
for `p ∈ h.index`, such that these sets form a disjoint covering of almost every `s`. -/
@[nolint unusedArguments]
protected def covering (_h : FineSubfamilyOn v f s) : X × Set X → Set X := fun p => p.2