English
FiniteMulArchimedeanClass M is the quotient of the nontrivial Archimedean classes by the archimedean equivalence, i.e. the subset of MulArchimedeanClass M not equal to ⊤.
Русский
FiniteMulArchimedeanClass M — это фактор пространства немалок Архимедеанских классов по архимедеанскому эквиваленту; подтип MulArchimedeanClass M, не равный ⊤.
LaTeX
$$abbrev FiniteMulArchimedeanClass := { A : MulArchimedeanClass M // A ≠ ⊤ }$$
Lean4
@[to_additive]
theorem ballSubgroup_antitone : Antitone (ballSubgroup (M := M)) :=
by
intro _ _ h
exact subgroup_antitone <| (UpperSet.Ioi_strictMono _).monotone h