English
For H, h with s ≤ t and g ∈ H, the map quotientSubgroupOfMapOfLE H h sends the coset of g to the same coset, i.e., it preserves representatives.
Русский
Для H, h с s ≤ t и g ∈ H отображение quotientSubgroupOfMapOfLE H h отправляет косет g в тот же косет, т.е. сохраняет представителя.
LaTeX
$$$\\text{If } h: s \\le t, \\quad (\\operatorname{QuotientGroup.mk} g) \\; \\mapsto \\; \\operatorname{QuotientGroup.mk} g,$$$
Lean4
@[to_additive (attr := simp)]
theorem quotientSubgroupOfMapOfLE_apply_mk (H : Subgroup α) (h : s ≤ t) (g : H) :
quotientSubgroupOfMapOfLE H h (QuotientGroup.mk g) = QuotientGroup.mk g :=
rfl